{"version":3,"file":"index.js","sources":["../src/tokenizer/types.js","../src/util/scopeflags.js","../src/util/whitespace.js","../src/util/location.js","../src/parser/base.js","../src/parser/comments.js","../src/parser/location.js","../src/plugins/estree.js","../src/tokenizer/context.js","../../babel-helper-validator-identifier/src/identifier.js","../../babel-helper-validator-identifier/src/keyword.js","../src/util/identifier.js","../src/plugins/flow.js","../src/plugins/jsx/xhtml.js","../src/plugins/jsx/index.js","../src/util/scope.js","../src/plugins/typescript/scope.js","../src/util/production-parameter.js","../src/plugins/typescript/index.js","../src/plugins/placeholders.js","../src/plugins/v8intrinsic.js","../src/plugin-utils.js","../src/options.js","../src/tokenizer/state.js","../src/tokenizer/index.js","../src/parser/util.js","../src/parser/node.js","../src/parser/lval.js","../src/parser/expression.js","../src/parser/statement.js","../src/util/class-scope.js","../src/parser/index.js","../src/index.js"],"sourcesContent":["// @flow\n\n// ## Token types\n\n// The assignment of fine-grained, information-carrying type objects\n// allows the tokenizer to store the information it has about a\n// token in a way that is very cheap for the parser to look up.\n\n// All token type variables start with an underscore, to make them\n// easy to recognize.\n\n// The `beforeExpr` property is used to disambiguate between regular\n// expressions and divisions. It is set on all token types that can\n// be followed by an expression (thus, a slash after them would be a\n// regular expression).\n\n// The `startsExpr` property is used to determine whether an expression\n// may be the “argument” subexpression of a `yield` expression or\n// `yield` statement. It is set on all token types that may be at the\n// start of a subexpression.\n\n// `isLoop` marks a keyword as starting a loop, which is important\n// to know when parsing a label, in order to allow or disallow\n// continue jumps to that label.\n\nconst beforeExpr = true;\nconst startsExpr = true;\nconst isLoop = true;\nconst isAssign = true;\nconst prefix = true;\nconst postfix = true;\n\ntype TokenOptions = {\n  keyword?: string,\n  beforeExpr?: boolean,\n  startsExpr?: boolean,\n  rightAssociative?: boolean,\n  isLoop?: boolean,\n  isAssign?: boolean,\n  prefix?: boolean,\n  postfix?: boolean,\n  binop?: ?number,\n};\n\nexport class TokenType {\n  label: string;\n  keyword: ?string;\n  beforeExpr: boolean;\n  startsExpr: boolean;\n  rightAssociative: boolean;\n  isLoop: boolean;\n  isAssign: boolean;\n  prefix: boolean;\n  postfix: boolean;\n  binop: ?number;\n  updateContext: ?(prevType: TokenType) => void;\n\n  constructor(label: string, conf: TokenOptions = {}) {\n    this.label = label;\n    this.keyword = conf.keyword;\n    this.beforeExpr = !!conf.beforeExpr;\n    this.startsExpr = !!conf.startsExpr;\n    this.rightAssociative = !!conf.rightAssociative;\n    this.isLoop = !!conf.isLoop;\n    this.isAssign = !!conf.isAssign;\n    this.prefix = !!conf.prefix;\n    this.postfix = !!conf.postfix;\n    this.binop = conf.binop != null ? conf.binop : null;\n    this.updateContext = null;\n  }\n}\n\nexport const keywords = new Map<string, TokenType>();\n\nfunction createKeyword(name: string, options: TokenOptions = {}): TokenType {\n  options.keyword = name;\n  const token = new TokenType(name, options);\n  keywords.set(name, token);\n  return token;\n}\n\nfunction createBinop(name: string, binop: number) {\n  return new TokenType(name, { beforeExpr, binop });\n}\n\nexport const types: { [name: string]: TokenType } = {\n  num: new TokenType(\"num\", { startsExpr }),\n  bigint: new TokenType(\"bigint\", { startsExpr }),\n  regexp: new TokenType(\"regexp\", { startsExpr }),\n  string: new TokenType(\"string\", { startsExpr }),\n  name: new TokenType(\"name\", { startsExpr }),\n  eof: new TokenType(\"eof\"),\n\n  // Punctuation token types.\n  bracketL: new TokenType(\"[\", { beforeExpr, startsExpr }),\n  bracketHashL: new TokenType(\"#[\", { beforeExpr, startsExpr }),\n  bracketBarL: new TokenType(\"[|\", { beforeExpr, startsExpr }),\n  bracketR: new TokenType(\"]\"),\n  bracketBarR: new TokenType(\"|]\"),\n  braceL: new TokenType(\"{\", { beforeExpr, startsExpr }),\n  braceBarL: new TokenType(\"{|\", { beforeExpr, startsExpr }),\n  braceHashL: new TokenType(\"#{\", { beforeExpr, startsExpr }),\n  braceR: new TokenType(\"}\"),\n  braceBarR: new TokenType(\"|}\"),\n  parenL: new TokenType(\"(\", { beforeExpr, startsExpr }),\n  parenR: new TokenType(\")\"),\n  comma: new TokenType(\",\", { beforeExpr }),\n  semi: new TokenType(\";\", { beforeExpr }),\n  colon: new TokenType(\":\", { beforeExpr }),\n  doubleColon: new TokenType(\"::\", { beforeExpr }),\n  dot: new TokenType(\".\"),\n  question: new TokenType(\"?\", { beforeExpr }),\n  questionDot: new TokenType(\"?.\"),\n  arrow: new TokenType(\"=>\", { beforeExpr }),\n  template: new TokenType(\"template\"),\n  ellipsis: new TokenType(\"...\", { beforeExpr }),\n  backQuote: new TokenType(\"`\", { startsExpr }),\n  dollarBraceL: new TokenType(\"${\", { beforeExpr, startsExpr }),\n  at: new TokenType(\"@\"),\n  hash: new TokenType(\"#\", { startsExpr }),\n\n  // Special hashbang token.\n  interpreterDirective: new TokenType(\"#!...\"),\n\n  // Operators. These carry several kinds of properties to help the\n  // parser use them properly (the presence of these properties is\n  // what categorizes them as operators).\n  //\n  // `binop`, when present, specifies that this operator is a binary\n  // operator, and will refer to its precedence.\n  //\n  // `prefix` and `postfix` mark the operator as a prefix or postfix\n  // unary operator.\n  //\n  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as\n  // binary operators with a very low precedence, that should result\n  // in AssignmentExpression nodes.\n\n  eq: new TokenType(\"=\", { beforeExpr, isAssign }),\n  assign: new TokenType(\"_=\", { beforeExpr, isAssign }),\n  incDec: new TokenType(\"++/--\", { prefix, postfix, startsExpr }),\n  bang: new TokenType(\"!\", { beforeExpr, prefix, startsExpr }),\n  tilde: new TokenType(\"~\", { beforeExpr, prefix, startsExpr }),\n  pipeline: createBinop(\"|>\", 0),\n  nullishCoalescing: createBinop(\"??\", 1),\n  logicalOR: createBinop(\"||\", 1),\n  logicalAND: createBinop(\"&&\", 2),\n  bitwiseOR: createBinop(\"|\", 3),\n  bitwiseXOR: createBinop(\"^\", 4),\n  bitwiseAND: createBinop(\"&\", 5),\n  equality: createBinop(\"==/!=/===/!==\", 6),\n  relational: createBinop(\"</>/<=/>=\", 7),\n  bitShift: createBinop(\"<</>>/>>>\", 8),\n  plusMin: new TokenType(\"+/-\", { beforeExpr, binop: 9, prefix, startsExpr }),\n  // startsExpr: required by v8intrinsic plugin\n  modulo: new TokenType(\"%\", { beforeExpr, binop: 10, startsExpr }),\n  star: createBinop(\"*\", 10),\n  slash: createBinop(\"/\", 10),\n  exponent: new TokenType(\"**\", {\n    beforeExpr,\n    binop: 11,\n    rightAssociative: true,\n  }),\n\n  // Keywords\n  // Don't forget to update packages/babel-helper-validator-identifier/src/keyword.js\n  // when new keywords are added\n  _break: createKeyword(\"break\"),\n  _case: createKeyword(\"case\", { beforeExpr }),\n  _catch: createKeyword(\"catch\"),\n  _continue: createKeyword(\"continue\"),\n  _debugger: createKeyword(\"debugger\"),\n  _default: createKeyword(\"default\", { beforeExpr }),\n  _do: createKeyword(\"do\", { isLoop, beforeExpr }),\n  _else: createKeyword(\"else\", { beforeExpr }),\n  _finally: createKeyword(\"finally\"),\n  _for: createKeyword(\"for\", { isLoop }),\n  _function: createKeyword(\"function\", { startsExpr }),\n  _if: createKeyword(\"if\"),\n  _return: createKeyword(\"return\", { beforeExpr }),\n  _switch: createKeyword(\"switch\"),\n  _throw: createKeyword(\"throw\", { beforeExpr, prefix, startsExpr }),\n  _try: createKeyword(\"try\"),\n  _var: createKeyword(\"var\"),\n  _const: createKeyword(\"const\"),\n  _while: createKeyword(\"while\", { isLoop }),\n  _with: createKeyword(\"with\"),\n  _new: createKeyword(\"new\", { beforeExpr, startsExpr }),\n  _this: createKeyword(\"this\", { startsExpr }),\n  _super: createKeyword(\"super\", { startsExpr }),\n  _class: createKeyword(\"class\", { startsExpr }),\n  _extends: createKeyword(\"extends\", { beforeExpr }),\n  _export: createKeyword(\"export\"),\n  _import: createKeyword(\"import\", { startsExpr }),\n  _null: createKeyword(\"null\", { startsExpr }),\n  _true: createKeyword(\"true\", { startsExpr }),\n  _false: createKeyword(\"false\", { startsExpr }),\n  _in: createKeyword(\"in\", { beforeExpr, binop: 7 }),\n  _instanceof: createKeyword(\"instanceof\", { beforeExpr, binop: 7 }),\n  _typeof: createKeyword(\"typeof\", { beforeExpr, prefix, startsExpr }),\n  _void: createKeyword(\"void\", { beforeExpr, prefix, startsExpr }),\n  _delete: createKeyword(\"delete\", { beforeExpr, prefix, startsExpr }),\n};\n","// @flow\n\n// Each scope gets a bitset that may contain these flags\n// prettier-ignore\nexport const SCOPE_OTHER        = 0b00000000,\n             SCOPE_PROGRAM      = 0b00000001,\n             SCOPE_FUNCTION     = 0b00000010,\n             SCOPE_ARROW        = 0b00000100,\n             SCOPE_SIMPLE_CATCH = 0b00001000,\n             SCOPE_SUPER        = 0b00010000,\n             SCOPE_DIRECT_SUPER = 0b00100000,\n             SCOPE_CLASS        = 0b01000000,\n             SCOPE_TS_MODULE    = 0b10000000,\n             SCOPE_VAR = SCOPE_PROGRAM | SCOPE_FUNCTION | SCOPE_TS_MODULE;\n\nexport type ScopeFlags =\n  | typeof SCOPE_OTHER\n  | typeof SCOPE_PROGRAM\n  | typeof SCOPE_FUNCTION\n  | typeof SCOPE_VAR\n  | typeof SCOPE_ARROW\n  | typeof SCOPE_SIMPLE_CATCH\n  | typeof SCOPE_SUPER\n  | typeof SCOPE_DIRECT_SUPER\n  | typeof SCOPE_CLASS;\n\n// These flags are meant to be _only_ used inside the Scope class (or subclasses).\n// prettier-ignore\nexport const BIND_KIND_VALUE           = 0b00000_0000_01,\n             BIND_KIND_TYPE            = 0b00000_0000_10,\n             // Used in checkLVal and declareName to determine the type of a binding\n             BIND_SCOPE_VAR            = 0b00000_0001_00, // Var-style binding\n             BIND_SCOPE_LEXICAL        = 0b00000_0010_00, // Let- or const-style binding\n             BIND_SCOPE_FUNCTION       = 0b00000_0100_00, // Function declaration\n             BIND_SCOPE_OUTSIDE        = 0b00000_1000_00, // Special case for function names as\n                                                   // bound inside the function\n             // Misc flags\n             BIND_FLAGS_NONE           = 0b00001_0000_00,\n             BIND_FLAGS_CLASS          = 0b00010_0000_00,\n             BIND_FLAGS_TS_ENUM        = 0b00100_0000_00,\n             BIND_FLAGS_TS_CONST_ENUM  = 0b01000_0000_00,\n             BIND_FLAGS_TS_EXPORT_ONLY = 0b10000_0000_00;\n\n// These flags are meant to be _only_ used by Scope consumers\n// prettier-ignore\n/*                              =    is value?    |    is type?    |      scope          |    misc flags    */\nexport const BIND_CLASS         = BIND_KIND_VALUE | BIND_KIND_TYPE | BIND_SCOPE_LEXICAL  | BIND_FLAGS_CLASS  ,\n             BIND_LEXICAL       = BIND_KIND_VALUE | 0              | BIND_SCOPE_LEXICAL  | 0                 ,\n             BIND_VAR           = BIND_KIND_VALUE | 0              | BIND_SCOPE_VAR      | 0                 ,\n             BIND_FUNCTION      = BIND_KIND_VALUE | 0              | BIND_SCOPE_FUNCTION | 0                 ,\n             BIND_TS_INTERFACE  = 0               | BIND_KIND_TYPE | 0                   | BIND_FLAGS_CLASS  ,\n             BIND_TS_TYPE       = 0               | BIND_KIND_TYPE | 0                   | 0                 ,\n             BIND_TS_ENUM       = BIND_KIND_VALUE | BIND_KIND_TYPE | BIND_SCOPE_LEXICAL  | BIND_FLAGS_TS_ENUM,\n             BIND_TS_AMBIENT    = 0               | 0              | 0            | BIND_FLAGS_TS_EXPORT_ONLY,\n             // These bindings don't introduce anything in the scope. They are used for assignments and\n             // function expressions IDs.\n             BIND_NONE          = 0               | 0              | 0                   | BIND_FLAGS_NONE   ,\n             BIND_OUTSIDE       = BIND_KIND_VALUE | 0              | 0                   | BIND_FLAGS_NONE   ,\n\n             BIND_TS_CONST_ENUM = BIND_TS_ENUM | BIND_FLAGS_TS_CONST_ENUM,\n             BIND_TS_NAMESPACE  = 0               | 0              | 0            | BIND_FLAGS_TS_EXPORT_ONLY;\n\nexport type BindingTypes =\n  | typeof BIND_NONE\n  | typeof BIND_OUTSIDE\n  | typeof BIND_VAR\n  | typeof BIND_LEXICAL\n  | typeof BIND_CLASS\n  | typeof BIND_FUNCTION\n  | typeof BIND_TS_INTERFACE\n  | typeof BIND_TS_TYPE\n  | typeof BIND_TS_ENUM\n  | typeof BIND_TS_AMBIENT\n  | typeof BIND_TS_NAMESPACE;\n\n// prettier-ignore\nexport const CLASS_ELEMENT_FLAG_STATIC = 0b1_00,\n             CLASS_ELEMENT_KIND_GETTER = 0b0_10,\n             CLASS_ELEMENT_KIND_SETTER = 0b0_01,\n             CLASS_ELEMENT_KIND_ACCESSOR = CLASS_ELEMENT_KIND_GETTER | CLASS_ELEMENT_KIND_SETTER;\n\n// prettier-ignore\nexport const CLASS_ELEMENT_STATIC_GETTER   = CLASS_ELEMENT_KIND_GETTER | CLASS_ELEMENT_FLAG_STATIC,\n             CLASS_ELEMENT_STATIC_SETTER   = CLASS_ELEMENT_KIND_SETTER | CLASS_ELEMENT_FLAG_STATIC,\n             CLASS_ELEMENT_INSTANCE_GETTER = CLASS_ELEMENT_KIND_GETTER,\n             CLASS_ELEMENT_INSTANCE_SETTER = CLASS_ELEMENT_KIND_SETTER,\n             CLASS_ELEMENT_OTHER           = 0;\n\nexport type ClassElementTypes =\n  | typeof CLASS_ELEMENT_STATIC_GETTER\n  | typeof CLASS_ELEMENT_STATIC_SETTER\n  | typeof CLASS_ELEMENT_INSTANCE_GETTER\n  | typeof CLASS_ELEMENT_INSTANCE_SETTER\n  | typeof CLASS_ELEMENT_OTHER;\n","// @flow\n\nimport * as charCodes from \"charcodes\";\n\n// Matches a whole line break (where CRLF is considered a single\n// line break). Used to count lines.\nexport const lineBreak = /\\r\\n?|[\\n\\u2028\\u2029]/;\nexport const lineBreakG = new RegExp(lineBreak.source, \"g\");\n\n// https://tc39.github.io/ecma262/#sec-line-terminators\nexport function isNewLine(code: number): boolean {\n  switch (code) {\n    case charCodes.lineFeed:\n    case charCodes.carriageReturn:\n    case charCodes.lineSeparator:\n    case charCodes.paragraphSeparator:\n      return true;\n\n    default:\n      return false;\n  }\n}\n\nexport const skipWhiteSpace = /(?:\\s|\\/\\/.*|\\/\\*[^]*?\\*\\/)*/g;\n\n// https://tc39.github.io/ecma262/#sec-white-space\nexport function isWhitespace(code: number): boolean {\n  switch (code) {\n    case 0x0009: // CHARACTER TABULATION\n    case 0x000b: // LINE TABULATION\n    case 0x000c: // FORM FEED\n    case charCodes.space:\n    case charCodes.nonBreakingSpace:\n    case charCodes.oghamSpaceMark:\n    case 0x2000: // EN QUAD\n    case 0x2001: // EM QUAD\n    case 0x2002: // EN SPACE\n    case 0x2003: // EM SPACE\n    case 0x2004: // THREE-PER-EM SPACE\n    case 0x2005: // FOUR-PER-EM SPACE\n    case 0x2006: // SIX-PER-EM SPACE\n    case 0x2007: // FIGURE SPACE\n    case 0x2008: // PUNCTUATION SPACE\n    case 0x2009: // THIN SPACE\n    case 0x200a: // HAIR SPACE\n    case 0x202f: // NARROW NO-BREAK SPACE\n    case 0x205f: // MEDIUM MATHEMATICAL SPACE\n    case 0x3000: // IDEOGRAPHIC SPACE\n    case 0xfeff: // ZERO WIDTH NO-BREAK SPACE\n      return true;\n\n    default:\n      return false;\n  }\n}\n","// @flow\n\nimport { lineBreakG } from \"./whitespace\";\n\nexport type Pos = {\n  start: number,\n};\n\n// These are used when `options.locations` is on, for the\n// `startLoc` and `endLoc` properties.\n\nexport class Position {\n  line: number;\n  column: number;\n\n  constructor(line: number, col: number) {\n    this.line = line;\n    this.column = col;\n  }\n}\n\nexport class SourceLocation {\n  start: Position;\n  end: Position;\n  filename: string;\n  identifierName: ?string;\n\n  constructor(start: Position, end?: Position) {\n    this.start = start;\n    // $FlowIgnore (may start as null, but initialized later)\n    this.end = end;\n  }\n}\n\n// The `getLineInfo` function is mostly useful when the\n// `locations` option is off (for performance reasons) and you\n// want to find the line/column position for a given character\n// offset. `input` should be the code string that the offset refers\n// into.\n\nexport function getLineInfo(input: string, offset: number): Position {\n  let line = 1;\n  let lineStart = 0;\n  let match;\n  lineBreakG.lastIndex = 0;\n  while ((match = lineBreakG.exec(input)) && match.index < offset) {\n    line++;\n    lineStart = lineBreakG.lastIndex;\n  }\n\n  return new Position(line, offset - lineStart);\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport type State from \"../tokenizer/state\";\nimport type { PluginsMap } from \"./index\";\nimport type ScopeHandler from \"../util/scope\";\nimport type ClassScopeHandler from \"../util/class-scope\";\nimport type ProductionParameterHandler from \"../util/production-parameter\";\n\nexport default class BaseParser {\n  // Properties set by constructor in index.js\n  options: Options;\n  inModule: boolean;\n  scope: ScopeHandler<*>;\n  classScope: ClassScopeHandler;\n  prodParam: ProductionParameterHandler;\n  plugins: PluginsMap;\n  filename: ?string;\n  sawUnambiguousESM: boolean = false;\n  ambiguousScriptDifferentAst: boolean = false;\n\n  // Initialized by Tokenizer\n  state: State;\n  // input and length are not in state as they are constant and we do\n  // not want to ever copy them, which happens if state gets cloned\n  input: string;\n  length: number;\n\n  hasPlugin(name: string): boolean {\n    return this.plugins.has(name);\n  }\n\n  getPluginOption(plugin: string, name: string) {\n    // $FlowIssue\n    if (this.hasPlugin(plugin)) return this.plugins.get(plugin)[name];\n  }\n}\n","// @flow\n\n/**\n * Based on the comment attachment algorithm used in espree and estraverse.\n *\n * Redistribution and use in source and binary forms, with or without\n * modification, are permitted provided that the following conditions are met:\n *\n * * Redistributions of source code must retain the above copyright\n *   notice, this list of conditions and the following disclaimer.\n * * Redistributions in binary form must reproduce the above copyright\n *   notice, this list of conditions and the following disclaimer in the\n *   documentation and/or other materials provided with the distribution.\n *\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY\n * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n */\n\nimport BaseParser from \"./base\";\nimport type { Comment, Node } from \"../types\";\n\nfunction last<T>(stack: $ReadOnlyArray<T>): T {\n  return stack[stack.length - 1];\n}\n\nexport default class CommentsParser extends BaseParser {\n  addComment(comment: Comment): void {\n    if (this.filename) comment.loc.filename = this.filename;\n    this.state.trailingComments.push(comment);\n    this.state.leadingComments.push(comment);\n  }\n\n  adjustCommentsAfterTrailingComma(\n    node: Node,\n    elements: (Node | null)[],\n    // When the current node is followed by a token which hasn't a respective AST node, we\n    // need to take all the trailing comments to prevent them from being attached to an\n    // unrelated node. e.g. in\n    //     var { x } /* cmt */ = { y }\n    // we don't want /* cmt */ to be attached to { y }.\n    // On the other hand, in\n    //     fn(x) [new line] /* cmt */ [new line] y\n    // /* cmt */ is both a trailing comment of fn(x) and a leading comment of y\n    takeAllComments?: boolean,\n  ) {\n    if (this.state.leadingComments.length === 0) {\n      return;\n    }\n\n    let lastElement = null;\n    let i = elements.length;\n    while (lastElement === null && i > 0) {\n      lastElement = elements[--i];\n    }\n    if (lastElement === null) {\n      return;\n    }\n\n    for (let j = 0; j < this.state.leadingComments.length; j++) {\n      if (\n        this.state.leadingComments[j].end < this.state.commentPreviousNode.end\n      ) {\n        this.state.leadingComments.splice(j, 1);\n        j--;\n      }\n    }\n\n    const newTrailingComments = [];\n    for (let i = 0; i < this.state.leadingComments.length; i++) {\n      const leadingComment = this.state.leadingComments[i];\n      if (leadingComment.end < node.end) {\n        newTrailingComments.push(leadingComment);\n\n        // Perf: we don't need to splice if we are going to reset the array anyway\n        if (!takeAllComments) {\n          this.state.leadingComments.splice(i, 1);\n          i--;\n        }\n      } else {\n        if (node.trailingComments === undefined) {\n          node.trailingComments = [];\n        }\n        node.trailingComments.push(leadingComment);\n      }\n    }\n    if (takeAllComments) this.state.leadingComments = [];\n\n    if (newTrailingComments.length > 0) {\n      lastElement.trailingComments = newTrailingComments;\n    } else if (lastElement.trailingComments !== undefined) {\n      lastElement.trailingComments = [];\n    }\n  }\n\n  processComment(node: Node): void {\n    if (node.type === \"Program\" && node.body.length > 0) return;\n\n    const stack = this.state.commentStack;\n\n    let firstChild, lastChild, trailingComments, i, j;\n\n    if (this.state.trailingComments.length > 0) {\n      // If the first comment in trailingComments comes after the\n      // current node, then we're good - all comments in the array will\n      // come after the node and so it's safe to add them as official\n      // trailingComments.\n      if (this.state.trailingComments[0].start >= node.end) {\n        trailingComments = this.state.trailingComments;\n        this.state.trailingComments = [];\n      } else {\n        // Otherwise, if the first comment doesn't come after the\n        // current node, that means we have a mix of leading and trailing\n        // comments in the array and that leadingComments contains the\n        // same items as trailingComments. Reset trailingComments to\n        // zero items and we'll handle this by evaluating leadingComments\n        // later.\n        this.state.trailingComments.length = 0;\n      }\n    } else if (stack.length > 0) {\n      const lastInStack = last(stack);\n      if (\n        lastInStack.trailingComments &&\n        lastInStack.trailingComments[0].start >= node.end\n      ) {\n        trailingComments = lastInStack.trailingComments;\n        delete lastInStack.trailingComments;\n      }\n    }\n\n    // Eating the stack.\n    if (stack.length > 0 && last(stack).start >= node.start) {\n      firstChild = stack.pop();\n    }\n\n    while (stack.length > 0 && last(stack).start >= node.start) {\n      lastChild = stack.pop();\n    }\n\n    if (!lastChild && firstChild) lastChild = firstChild;\n\n    // Adjust comments that follow a trailing comma on the last element in a\n    // comma separated list of nodes to be the trailing comments on the last\n    // element\n    if (firstChild) {\n      switch (node.type) {\n        case \"ObjectExpression\":\n          this.adjustCommentsAfterTrailingComma(node, node.properties);\n          break;\n        case \"ObjectPattern\":\n          this.adjustCommentsAfterTrailingComma(node, node.properties, true);\n          break;\n        case \"CallExpression\":\n          this.adjustCommentsAfterTrailingComma(node, node.arguments);\n          break;\n        case \"ArrayExpression\":\n          this.adjustCommentsAfterTrailingComma(node, node.elements);\n          break;\n        case \"ArrayPattern\":\n          this.adjustCommentsAfterTrailingComma(node, node.elements, true);\n          break;\n      }\n    } else if (\n      this.state.commentPreviousNode &&\n      ((this.state.commentPreviousNode.type === \"ImportSpecifier\" &&\n        node.type !== \"ImportSpecifier\") ||\n        (this.state.commentPreviousNode.type === \"ExportSpecifier\" &&\n          node.type !== \"ExportSpecifier\"))\n    ) {\n      this.adjustCommentsAfterTrailingComma(node, [\n        this.state.commentPreviousNode,\n      ]);\n    }\n\n    if (lastChild) {\n      if (lastChild.leadingComments) {\n        if (\n          lastChild !== node &&\n          lastChild.leadingComments.length > 0 &&\n          last(lastChild.leadingComments).end <= node.start\n        ) {\n          node.leadingComments = lastChild.leadingComments;\n          delete lastChild.leadingComments;\n        } else {\n          // A leading comment for an anonymous class had been stolen by its first ClassMethod,\n          // so this takes back the leading comment.\n          // See also: https://github.com/eslint/espree/issues/158\n          for (i = lastChild.leadingComments.length - 2; i >= 0; --i) {\n            if (lastChild.leadingComments[i].end <= node.start) {\n              node.leadingComments = lastChild.leadingComments.splice(0, i + 1);\n              break;\n            }\n          }\n        }\n      }\n    } else if (this.state.leadingComments.length > 0) {\n      if (last(this.state.leadingComments).end <= node.start) {\n        if (this.state.commentPreviousNode) {\n          for (j = 0; j < this.state.leadingComments.length; j++) {\n            if (\n              this.state.leadingComments[j].end <\n              this.state.commentPreviousNode.end\n            ) {\n              this.state.leadingComments.splice(j, 1);\n              j--;\n            }\n          }\n        }\n        if (this.state.leadingComments.length > 0) {\n          node.leadingComments = this.state.leadingComments;\n          this.state.leadingComments = [];\n        }\n      } else {\n        // https://github.com/eslint/espree/issues/2\n        //\n        // In special cases, such as return (without a value) and\n        // debugger, all comments will end up as leadingComments and\n        // will otherwise be eliminated. This step runs when the\n        // commentStack is empty and there are comments left\n        // in leadingComments.\n        //\n        // This loop figures out the stopping point between the actual\n        // leading and trailing comments by finding the location of the\n        // first comment that comes after the given node.\n        for (i = 0; i < this.state.leadingComments.length; i++) {\n          if (this.state.leadingComments[i].end > node.start) {\n            break;\n          }\n        }\n\n        // Split the array based on the location of the first comment\n        // that comes after the node. Keep in mind that this could\n        // result in an empty array, and if so, the array must be\n        // deleted.\n        const leadingComments = this.state.leadingComments.slice(0, i);\n\n        if (leadingComments.length) {\n          node.leadingComments = leadingComments;\n        }\n\n        // Similarly, trailing comments are attached later. The variable\n        // must be reset to null if there are no trailing comments.\n        trailingComments = this.state.leadingComments.slice(i);\n        if (trailingComments.length === 0) {\n          trailingComments = null;\n        }\n      }\n    }\n\n    this.state.commentPreviousNode = node;\n\n    if (trailingComments) {\n      if (\n        trailingComments.length &&\n        trailingComments[0].start >= node.start &&\n        last(trailingComments).end <= node.end\n      ) {\n        node.innerComments = trailingComments;\n      } else {\n        node.trailingComments = trailingComments;\n      }\n    }\n\n    stack.push(node);\n  }\n}\n","// @flow\n/* eslint sort-keys: \"error\" */\nimport { getLineInfo, type Position } from \"../util/location\";\nimport CommentsParser from \"./comments\";\n\n// This function is used to raise exceptions on parse errors. It\n// takes an offset integer (into the current `input`) to indicate\n// the location of the error, attaches the position to the end\n// of the error message, and then raises a `SyntaxError` with that\n// message.\n\ntype ErrorContext = {\n  pos: number,\n  loc: Position,\n  missingPlugin?: Array<string>,\n  code?: string,\n};\n\n// The Errors key follows https://cs.chromium.org/chromium/src/v8/src/common/message-template.h unless it does not exist\nexport const Errors = Object.freeze({\n  ArgumentsDisallowedInInitializer:\n    \"'arguments' is not allowed in class field initializer\",\n  AsyncFunctionInSingleStatementContext:\n    \"Async functions can only be declared at the top level or inside a block\",\n  AwaitBindingIdentifier:\n    \"Can not use 'await' as identifier inside an async function\",\n  AwaitExpressionFormalParameter:\n    \"await is not allowed in async function parameters\",\n  AwaitNotInAsyncFunction:\n    \"Can not use keyword 'await' outside an async function\",\n  BadGetterArity: \"getter must not have any formal parameters\",\n  BadSetterArity: \"setter must have exactly one formal parameter\",\n  BadSetterRestParameter:\n    \"setter function argument must not be a rest parameter\",\n  ConstructorClassField: \"Classes may not have a field named 'constructor'\",\n  ConstructorClassPrivateField:\n    \"Classes may not have a private field named '#constructor'\",\n  ConstructorIsAccessor: \"Class constructor may not be an accessor\",\n  ConstructorIsAsync: \"Constructor can't be an async function\",\n  ConstructorIsGenerator: \"Constructor can't be a generator\",\n  DeclarationMissingInitializer: \"%0 require an initialization value\",\n  DecoratorBeforeExport:\n    \"Decorators must be placed *before* the 'export' keyword. You can set the 'decoratorsBeforeExport' option to false to use the 'export @decorator class {}' syntax\",\n  DecoratorConstructor:\n    \"Decorators can't be used with a constructor. Did you mean '@dec class { ... }'?\",\n  DecoratorExportClass:\n    \"Using the export keyword between a decorator and a class is not allowed. Please use `export @dec class` instead.\",\n  DecoratorSemicolon: \"Decorators must not be followed by a semicolon\",\n  DeletePrivateField: \"Deleting a private field is not allowed\",\n  DestructureNamedImport:\n    \"ES2015 named imports do not destructure. Use another statement for destructuring after the import.\",\n  DuplicateConstructor: \"Duplicate constructor in the same class\",\n  DuplicateDefaultExport: \"Only one default export allowed per module.\",\n  DuplicateExport:\n    \"`%0` has already been exported. Exported identifiers must be unique.\",\n  DuplicateProto: \"Redefinition of __proto__ property\",\n  DuplicateRegExpFlags: \"Duplicate regular expression flag\",\n  ElementAfterRest: \"Rest element must be last element\",\n  EscapedCharNotAnIdentifier: \"Invalid Unicode escape\",\n  ForInOfLoopInitializer:\n    \"%0 loop variable declaration may not have an initializer\",\n  GeneratorInSingleStatementContext:\n    \"Generators can only be declared at the top level or inside a block\",\n  IllegalBreakContinue: \"Unsyntactic %0\",\n  IllegalLanguageModeDirective:\n    \"Illegal 'use strict' directive in function with non-simple parameter list\",\n  IllegalReturn: \"'return' outside of function\",\n  ImportCallArgumentTrailingComma:\n    \"Trailing comma is disallowed inside import(...) arguments\",\n  ImportCallArity: \"import() requires exactly one argument\",\n  ImportCallArityLtOne: \"Dynamic imports require a parameter: import('a.js')\",\n  ImportCallNotNewExpression: \"Cannot use new with import(...)\",\n  ImportCallSpreadArgument: \"... is not allowed in import()\",\n  ImportMetaOutsideModule: `import.meta may appear only with 'sourceType: \"module\"'`,\n  ImportOutsideModule: `'import' and 'export' may appear only with 'sourceType: \"module\"'`,\n  InvalidCodePoint: \"Code point out of bounds\",\n  InvalidDigit: \"Expected number in radix %0\",\n  InvalidEscapeSequence: \"Bad character escape sequence\",\n  InvalidEscapeSequenceTemplate: \"Invalid escape sequence in template\",\n  InvalidEscapedReservedWord: \"Escape sequence in keyword %0\",\n  InvalidIdentifier: \"Invalid identifier %0\",\n  InvalidLhs: \"Invalid left-hand side in %0\",\n  InvalidLhsBinding: \"Binding invalid left-hand side in %0\",\n  InvalidNumber: \"Invalid number\",\n  InvalidOrUnexpectedToken: \"Unexpected character '%0'\",\n  InvalidParenthesizedAssignment: \"Invalid parenthesized assignment pattern\",\n  InvalidPrivateFieldResolution: \"Private name #%0 is not defined\",\n  InvalidPropertyBindingPattern: \"Binding member expression\",\n  InvalidRestAssignmentPattern: \"Invalid rest operator's argument\",\n  LabelRedeclaration: \"Label '%0' is already declared\",\n  LetInLexicalBinding:\n    \"'let' is not allowed to be used as a name in 'let' or 'const' declarations.\",\n  MalformedRegExpFlags: \"Invalid regular expression flag\",\n  MissingClassName: \"A class name is required\",\n  MissingEqInAssignment:\n    \"Only '=' operator can be used for specifying default value.\",\n  MissingUnicodeEscape: \"Expecting Unicode escape sequence \\\\uXXXX\",\n  MixingCoalesceWithLogical:\n    \"Nullish coalescing operator(??) requires parens when mixing with logical operators\",\n  ModuleExportUndefined: \"Export '%0' is not defined\",\n  MultipleDefaultsInSwitch: \"Multiple default clauses\",\n  NewlineAfterThrow: \"Illegal newline after throw\",\n  NoCatchOrFinally: \"Missing catch or finally clause\",\n  NumberIdentifier: \"Identifier directly after number\",\n  NumericSeparatorInEscapeSequence:\n    \"Numeric separators are not allowed inside unicode escape sequences or hex escape sequences\",\n  ObsoleteAwaitStar:\n    \"await* has been removed from the async functions proposal. Use Promise.all() instead.\",\n  OptionalChainingNoNew:\n    \"constructors in/after an Optional Chain are not allowed\",\n  OptionalChainingNoTemplate:\n    \"Tagged Template Literals are not allowed in optionalChain\",\n  ParamDupe: \"Argument name clash\",\n  PatternHasAccessor: \"Object pattern can't contain getter or setter\",\n  PatternHasMethod: \"Object pattern can't contain methods\",\n  PipelineBodyNoArrow:\n    'Unexpected arrow \"=>\" after pipeline body; arrow function in pipeline body must be parenthesized',\n  PipelineBodySequenceExpression:\n    \"Pipeline body may not be a comma-separated sequence expression\",\n  PipelineHeadSequenceExpression:\n    \"Pipeline head should not be a comma-separated sequence expression\",\n  PipelineTopicUnused:\n    \"Pipeline is in topic style but does not use topic reference\",\n  PrimaryTopicNotAllowed:\n    \"Topic reference was used in a lexical context without topic binding\",\n  PrimaryTopicRequiresSmartPipeline:\n    \"Primary Topic Reference found but pipelineOperator not passed 'smart' for 'proposal' option.\",\n  PrivateNameRedeclaration: \"Duplicate private name #%0\",\n  RecordExpressionBarIncorrectEndSyntaxType:\n    \"Record expressions ending with '|}' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'\",\n  RecordExpressionBarIncorrectStartSyntaxType:\n    \"Record expressions starting with '{|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'\",\n  RecordExpressionHashIncorrectStartSyntaxType:\n    \"Record expressions starting with '#{' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'\",\n  RestTrailingComma: \"Unexpected trailing comma after rest element\",\n  SloppyFunction:\n    \"In non-strict mode code, functions can only be declared at top level, inside a block, or as the body of an if statement\",\n  StaticPrototype: \"Classes may not have static property named prototype\",\n  StrictDelete: \"Deleting local variable in strict mode\",\n  StrictEvalArguments: \"Assigning to '%0' in strict mode\",\n  StrictEvalArgumentsBinding: \"Binding '%0' in strict mode\",\n  StrictFunction:\n    \"In strict mode code, functions can only be declared at top level or inside a block\",\n  StrictOctalLiteral: \"Legacy octal literals are not allowed in strict mode\",\n  StrictWith: \"'with' in strict mode\",\n  SuperNotAllowed:\n    \"super() is only valid inside a class constructor of a subclass. Maybe a typo in the method name ('constructor') or not extending another class?\",\n  SuperPrivateField: \"Private fields can't be accessed on super\",\n  TrailingDecorator: \"Decorators must be attached to a class element\",\n  TupleExpressionBarIncorrectEndSyntaxType:\n    \"Tuple expressions ending with '|]' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'\",\n  TupleExpressionBarIncorrectStartSyntaxType:\n    \"Tuple expressions starting with '[|' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'bar'\",\n  TupleExpressionHashIncorrectStartSyntaxType:\n    \"Tuple expressions starting with '#[' are only allowed when the 'syntaxType' option of the 'recordAndTuple' plugin is set to 'hash'\",\n  UnexpectedArgumentPlaceholder: \"Unexpected argument placeholder\",\n  UnexpectedAwaitAfterPipelineBody:\n    'Unexpected \"await\" after pipeline body; await must have parentheses in minimal proposal',\n  UnexpectedDigitAfterHash: \"Unexpected digit after hash token\",\n  UnexpectedImportExport:\n    \"'import' and 'export' may only appear at the top level\",\n  UnexpectedKeyword: \"Unexpected keyword '%0'\",\n  UnexpectedLeadingDecorator:\n    \"Leading decorators must be attached to a class declaration\",\n  UnexpectedLexicalDeclaration:\n    \"Lexical declaration cannot appear in a single-statement context\",\n  UnexpectedNewTarget: \"new.target can only be used in functions\",\n  UnexpectedNumericSeparator:\n    \"A numeric separator is only allowed between two digits\",\n  UnexpectedPrivateField:\n    \"Private names can only be used as the name of a class element (i.e. class C { #p = 42; #m() {} } )\\n or a property of member expression (i.e. this.#p).\",\n  UnexpectedReservedWord: \"Unexpected reserved word '%0'\",\n  UnexpectedSuper: \"super is only allowed in object methods and classes\",\n  UnexpectedToken: \"Unexpected token '%'\",\n  UnexpectedTokenUnaryExponentiation:\n    \"Illegal expression. Wrap left hand side or entire exponentiation in parentheses.\",\n  UnsupportedBind: \"Binding should be performed on object property.\",\n  UnsupportedDecoratorExport:\n    \"A decorated export must export a class declaration\",\n  UnsupportedDefaultExport:\n    \"Only expressions, functions or classes are allowed as the `default` export.\",\n  UnsupportedImport: \"import can only be used in import() or import.meta\",\n  UnsupportedMetaProperty: \"The only valid meta property for %0 is %0.%1\",\n  UnsupportedParameterDecorator:\n    \"Decorators cannot be used to decorate parameters\",\n  UnsupportedPropertyDecorator:\n    \"Decorators cannot be used to decorate object literal properties\",\n  UnsupportedSuper:\n    \"super can only be used with function calls (i.e. super()) or in property accesses (i.e. super.prop or super[prop])\",\n  UnterminatedComment: \"Unterminated comment\",\n  UnterminatedRegExp: \"Unterminated regular expression\",\n  UnterminatedString: \"Unterminated string constant\",\n  UnterminatedTemplate: \"Unterminated template\",\n  VarRedeclaration: \"Identifier '%0' has already been declared\",\n  YieldBindingIdentifier:\n    \"Can not use 'yield' as identifier inside a generator\",\n  YieldInParameter: \"yield is not allowed in generator parameters\",\n  ZeroDigitNumericSeparator:\n    \"Numeric separator can not be used after leading 0\",\n});\n\nexport default class LocationParser extends CommentsParser {\n  // Forward-declaration: defined in tokenizer/index.js\n  /*::\n  +isLookahead: boolean;\n  */\n\n  getLocationForPosition(pos: number): Position {\n    let loc;\n    if (pos === this.state.start) loc = this.state.startLoc;\n    else if (pos === this.state.lastTokStart) loc = this.state.lastTokStartLoc;\n    else if (pos === this.state.end) loc = this.state.endLoc;\n    else if (pos === this.state.lastTokEnd) loc = this.state.lastTokEndLoc;\n    else loc = getLineInfo(this.input, pos);\n\n    return loc;\n  }\n\n  raise(pos: number, errorTemplate: string, ...params: any): Error | empty {\n    return this.raiseWithData(pos, undefined, errorTemplate, ...params);\n  }\n\n  raiseWithData(\n    pos: number,\n    data?: {\n      missingPlugin?: Array<string>,\n      code?: string,\n    },\n    errorTemplate: string,\n    ...params: any\n  ): Error | empty {\n    const loc = this.getLocationForPosition(pos);\n    const message =\n      errorTemplate.replace(/%(\\d+)/g, (_, i: number) => params[i]) +\n      ` (${loc.line}:${loc.column})`;\n    return this._raise(Object.assign(({ loc, pos }: Object), data), message);\n  }\n\n  _raise(errorContext: ErrorContext, message: string): Error | empty {\n    // $FlowIgnore\n    const err: SyntaxError & ErrorContext = new SyntaxError(message);\n    Object.assign(err, errorContext);\n    if (this.options.errorRecovery) {\n      if (!this.isLookahead) this.state.errors.push(err);\n      return err;\n    } else {\n      throw err;\n    }\n  }\n}\n","// @flow\n\nimport { types as tt, TokenType } from \"../tokenizer/types\";\nimport type Parser from \"../parser\";\nimport type { ExpressionErrors } from \"../parser/util\";\nimport * as N from \"../types\";\nimport type { Position } from \"../util/location\";\nimport { type BindingTypes, BIND_NONE } from \"../util/scopeflags\";\nimport { Errors } from \"../parser/location\";\n\nfunction isSimpleProperty(node: N.Node): boolean {\n  return (\n    node != null &&\n    node.type === \"Property\" &&\n    node.kind === \"init\" &&\n    node.method === false\n  );\n}\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    estreeParseRegExpLiteral({ pattern, flags }: N.RegExpLiteral): N.Node {\n      let regex = null;\n      try {\n        regex = new RegExp(pattern, flags);\n      } catch (e) {\n        // In environments that don't support these flags value will\n        // be null as the regex can't be represented natively.\n      }\n      const node = this.estreeParseLiteral(regex);\n      node.regex = { pattern, flags };\n\n      return node;\n    }\n\n    estreeParseBigIntLiteral(value: any): N.Node {\n      // https://github.com/estree/estree/blob/master/es2020.md#bigintliteral\n      // $FlowIgnore\n      const bigInt = typeof BigInt !== \"undefined\" ? BigInt(value) : null;\n      const node = this.estreeParseLiteral(bigInt);\n      node.bigint = String(node.value || value);\n\n      return node;\n    }\n\n    estreeParseLiteral(value: any): N.Node {\n      return this.parseLiteral(value, \"Literal\");\n    }\n\n    directiveToStmt(directive: N.Directive): N.ExpressionStatement {\n      const directiveLiteral = directive.value;\n\n      const stmt = this.startNodeAt(directive.start, directive.loc.start);\n      const expression = this.startNodeAt(\n        directiveLiteral.start,\n        directiveLiteral.loc.start,\n      );\n\n      expression.value = directiveLiteral.value;\n      expression.raw = directiveLiteral.extra.raw;\n\n      stmt.expression = this.finishNodeAt(\n        expression,\n        \"Literal\",\n        directiveLiteral.end,\n        directiveLiteral.loc.end,\n      );\n      stmt.directive = directiveLiteral.extra.raw.slice(1, -1);\n\n      return this.finishNodeAt(\n        stmt,\n        \"ExpressionStatement\",\n        directive.end,\n        directive.loc.end,\n      );\n    }\n\n    // ==================================\n    // Overrides\n    // ==================================\n\n    initFunction(\n      node: N.BodilessFunctionOrMethodBase,\n      isAsync: ?boolean,\n    ): void {\n      super.initFunction(node, isAsync);\n      node.expression = false;\n    }\n\n    checkDeclaration(node: N.Pattern | N.ObjectProperty): void {\n      if (isSimpleProperty(node)) {\n        this.checkDeclaration(((node: any): N.EstreeProperty).value);\n      } else {\n        super.checkDeclaration(node);\n      }\n    }\n\n    checkGetterSetterParams(method: N.ObjectMethod | N.ClassMethod): void {\n      const prop = ((method: any): N.EstreeProperty | N.EstreeMethodDefinition);\n      const paramCount = prop.kind === \"get\" ? 0 : 1;\n      const start = prop.start;\n      if (prop.value.params.length !== paramCount) {\n        if (method.kind === \"get\") {\n          this.raise(start, Errors.BadGetterArity);\n        } else {\n          this.raise(start, Errors.BadSetterArity);\n        }\n      } else if (\n        prop.kind === \"set\" &&\n        prop.value.params[0].type === \"RestElement\"\n      ) {\n        this.raise(start, Errors.BadSetterRestParameter);\n      }\n    }\n\n    checkLVal(\n      expr: N.Expression,\n      bindingType: BindingTypes = BIND_NONE,\n      checkClashes: ?{ [key: string]: boolean },\n      contextDescription: string,\n      disallowLetBinding?: boolean,\n    ): void {\n      switch (expr.type) {\n        case \"ObjectPattern\":\n          expr.properties.forEach(prop => {\n            this.checkLVal(\n              prop.type === \"Property\" ? prop.value : prop,\n              bindingType,\n              checkClashes,\n              \"object destructuring pattern\",\n              disallowLetBinding,\n            );\n          });\n          break;\n        default:\n          super.checkLVal(\n            expr,\n            bindingType,\n            checkClashes,\n            contextDescription,\n            disallowLetBinding,\n          );\n      }\n    }\n\n    checkDuplicatedProto(\n      prop: N.ObjectMember | N.SpreadElement,\n      protoRef: { used: boolean },\n      refExpressionErrors: ?ExpressionErrors,\n    ): void {\n      if (\n        prop.type === \"SpreadElement\" ||\n        prop.computed ||\n        prop.method ||\n        // $FlowIgnore\n        prop.shorthand\n      ) {\n        return;\n      }\n\n      const key = prop.key;\n      // It is either an Identifier or a String/NumericLiteral\n      const name = key.type === \"Identifier\" ? key.name : String(key.value);\n\n      if (name === \"__proto__\" && prop.kind === \"init\") {\n        // Store the first redefinition's position\n        if (protoRef.used) {\n          if (refExpressionErrors && refExpressionErrors.doubleProto === -1) {\n            refExpressionErrors.doubleProto = key.start;\n          } else {\n            this.raise(key.start, Errors.DuplicateProto);\n          }\n        }\n\n        protoRef.used = true;\n      }\n    }\n\n    isValidDirective(stmt: N.Statement): boolean {\n      return (\n        stmt.type === \"ExpressionStatement\" &&\n        stmt.expression.type === \"Literal\" &&\n        typeof stmt.expression.value === \"string\" &&\n        (!stmt.expression.extra || !stmt.expression.extra.parenthesized)\n      );\n    }\n\n    stmtToDirective(stmt: N.Statement): N.Directive {\n      const directive = super.stmtToDirective(stmt);\n      const value = stmt.expression.value;\n\n      // Reset value to the actual value as in estree mode we want\n      // the stmt to have the real value and not the raw value\n      directive.value.value = value;\n\n      return directive;\n    }\n\n    parseBlockBody(\n      node: N.BlockStatementLike,\n      allowDirectives: ?boolean,\n      topLevel: boolean,\n      end: TokenType,\n    ): void {\n      super.parseBlockBody(node, allowDirectives, topLevel, end);\n\n      const directiveStatements = node.directives.map(d =>\n        this.directiveToStmt(d),\n      );\n      node.body = directiveStatements.concat(node.body);\n      delete node.directives;\n    }\n\n    pushClassMethod(\n      classBody: N.ClassBody,\n      method: N.ClassMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isConstructor: boolean,\n      allowsDirectSuper: boolean,\n    ): void {\n      this.parseMethod(\n        method,\n        isGenerator,\n        isAsync,\n        isConstructor,\n        allowsDirectSuper,\n        \"ClassMethod\",\n        true,\n      );\n      if (method.typeParameters) {\n        // $FlowIgnore\n        method.value.typeParameters = method.typeParameters;\n        delete method.typeParameters;\n      }\n      classBody.body.push(method);\n    }\n\n    parseExprAtom(refExpressionErrors?: ?ExpressionErrors): N.Expression {\n      switch (this.state.type) {\n        case tt.num:\n        case tt.string:\n          return this.estreeParseLiteral(this.state.value);\n\n        case tt.regexp:\n          return this.estreeParseRegExpLiteral(this.state.value);\n\n        case tt.bigint:\n          return this.estreeParseBigIntLiteral(this.state.value);\n\n        case tt._null:\n          return this.estreeParseLiteral(null);\n\n        case tt._true:\n          return this.estreeParseLiteral(true);\n\n        case tt._false:\n          return this.estreeParseLiteral(false);\n\n        default:\n          return super.parseExprAtom(refExpressionErrors);\n      }\n    }\n\n    parseLiteral<T: N.Literal>(\n      value: any,\n      type: /*T[\"kind\"]*/ string,\n      startPos?: number,\n      startLoc?: Position,\n    ): T {\n      const node = super.parseLiteral(value, type, startPos, startLoc);\n      node.raw = node.extra.raw;\n      delete node.extra;\n\n      return node;\n    }\n\n    parseFunctionBody(\n      node: N.Function,\n      allowExpression: ?boolean,\n      isMethod?: boolean = false,\n    ): void {\n      super.parseFunctionBody(node, allowExpression, isMethod);\n      node.expression = node.body.type !== \"BlockStatement\";\n    }\n\n    parseMethod<T: N.MethodLike>(\n      node: T,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isConstructor: boolean,\n      allowDirectSuper: boolean,\n      type: string,\n      inClassScope: boolean = false,\n    ): T {\n      let funcNode = this.startNode();\n      funcNode.kind = node.kind; // provide kind, so super method correctly sets state\n      funcNode = super.parseMethod(\n        funcNode,\n        isGenerator,\n        isAsync,\n        isConstructor,\n        allowDirectSuper,\n        type,\n        inClassScope,\n      );\n      funcNode.type = \"FunctionExpression\";\n      delete funcNode.kind;\n      // $FlowIgnore\n      node.value = funcNode;\n\n      type = type === \"ClassMethod\" ? \"MethodDefinition\" : type;\n      return this.finishNode(node, type);\n    }\n\n    parseObjectMethod(\n      prop: N.ObjectMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isPattern: boolean,\n      containsEsc: boolean,\n    ): ?N.ObjectMethod {\n      const node: N.EstreeProperty = (super.parseObjectMethod(\n        prop,\n        isGenerator,\n        isAsync,\n        isPattern,\n        containsEsc,\n      ): any);\n\n      if (node) {\n        node.type = \"Property\";\n        if (((node: any): N.ClassMethod).kind === \"method\") node.kind = \"init\";\n        node.shorthand = false;\n      }\n\n      return (node: any);\n    }\n\n    parseObjectProperty(\n      prop: N.ObjectProperty,\n      startPos: ?number,\n      startLoc: ?Position,\n      isPattern: boolean,\n      refExpressionErrors: ?ExpressionErrors,\n    ): ?N.ObjectProperty {\n      const node: N.EstreeProperty = (super.parseObjectProperty(\n        prop,\n        startPos,\n        startLoc,\n        isPattern,\n        refExpressionErrors,\n      ): any);\n\n      if (node) {\n        node.kind = \"init\";\n        node.type = \"Property\";\n      }\n\n      return (node: any);\n    }\n\n    toAssignable(node: N.Node): N.Node {\n      if (isSimpleProperty(node)) {\n        this.toAssignable(node.value);\n\n        return node;\n      }\n\n      return super.toAssignable(node);\n    }\n\n    toAssignableObjectExpressionProp(prop: N.Node, isLast: boolean) {\n      if (prop.kind === \"get\" || prop.kind === \"set\") {\n        throw this.raise(prop.key.start, Errors.PatternHasAccessor);\n      } else if (prop.method) {\n        throw this.raise(prop.key.start, Errors.PatternHasMethod);\n      } else {\n        super.toAssignableObjectExpressionProp(prop, isLast);\n      }\n    }\n\n    finishCallExpression<T: N.CallExpression | N.OptionalCallExpression>(\n      node: T,\n      optional: boolean,\n    ): N.Expression {\n      super.finishCallExpression(node, optional);\n\n      if (node.callee.type === \"Import\") {\n        ((node: N.Node): N.EstreeImportExpression).type = \"ImportExpression\";\n        ((node: N.Node): N.EstreeImportExpression).source = node.arguments[0];\n        delete node.arguments;\n        delete node.callee;\n      }\n\n      return node;\n    }\n\n    toReferencedListDeep(\n      exprList: $ReadOnlyArray<?N.Expression>,\n      isParenthesizedExpr?: boolean,\n    ): void {\n      // ImportExpressions do not have an arguments array.\n      if (!exprList) {\n        return;\n      }\n\n      super.toReferencedListDeep(exprList, isParenthesizedExpr);\n    }\n\n    parseExport(node: N.Node) {\n      super.parseExport(node);\n\n      switch (node.type) {\n        case \"ExportAllDeclaration\":\n          node.exported = null;\n          break;\n\n        case \"ExportNamedDeclaration\":\n          if (\n            node.specifiers.length === 1 &&\n            node.specifiers[0].type === \"ExportNamespaceSpecifier\"\n          ) {\n            node.type = \"ExportAllDeclaration\";\n            node.exported = node.specifiers[0].exported;\n            delete node.specifiers;\n          }\n\n          break;\n      }\n\n      return node;\n    }\n  };\n","// @flow\n\n// The algorithm used to determine whether a regexp can appear at a\n// given point in the program is loosely based on sweet.js' approach.\n// See https://github.com/mozilla/sweet.js/wiki/design\n\nimport { types as tt } from \"./types\";\nimport { lineBreak } from \"../util/whitespace\";\n\nexport class TokContext {\n  constructor(\n    token: string,\n    isExpr?: boolean,\n    preserveSpace?: boolean,\n    override?: ?Function, // Takes a Tokenizer as a this-parameter, and returns void.\n  ) {\n    this.token = token;\n    this.isExpr = !!isExpr;\n    this.preserveSpace = !!preserveSpace;\n    this.override = override;\n  }\n\n  token: string;\n  isExpr: boolean;\n  preserveSpace: boolean;\n  override: ?Function;\n}\n\nexport const types: {\n  [key: string]: TokContext,\n} = {\n  braceStatement: new TokContext(\"{\", false),\n  braceExpression: new TokContext(\"{\", true),\n  templateQuasi: new TokContext(\"${\", false),\n  parenStatement: new TokContext(\"(\", false),\n  parenExpression: new TokContext(\"(\", true),\n  template: new TokContext(\"`\", true, true, p => p.readTmplToken()),\n  functionExpression: new TokContext(\"function\", true),\n  functionStatement: new TokContext(\"function\", false),\n};\n\n// Token-specific context update code\n\ntt.parenR.updateContext = tt.braceR.updateContext = function() {\n  if (this.state.context.length === 1) {\n    this.state.exprAllowed = true;\n    return;\n  }\n\n  let out = this.state.context.pop();\n  if (out === types.braceStatement && this.curContext().token === \"function\") {\n    out = this.state.context.pop();\n  }\n\n  this.state.exprAllowed = !out.isExpr;\n};\n\ntt.name.updateContext = function(prevType) {\n  let allowed = false;\n  if (prevType !== tt.dot) {\n    if (\n      (this.state.value === \"of\" && !this.state.exprAllowed) ||\n      (this.state.value === \"yield\" && this.prodParam.hasYield)\n    ) {\n      allowed = true;\n    }\n  }\n  this.state.exprAllowed = allowed;\n\n  if (this.state.isIterator) {\n    this.state.isIterator = false;\n  }\n};\n\ntt.braceL.updateContext = function(prevType) {\n  this.state.context.push(\n    this.braceIsBlock(prevType) ? types.braceStatement : types.braceExpression,\n  );\n  this.state.exprAllowed = true;\n};\n\ntt.dollarBraceL.updateContext = function() {\n  this.state.context.push(types.templateQuasi);\n  this.state.exprAllowed = true;\n};\n\ntt.parenL.updateContext = function(prevType) {\n  const statementParens =\n    prevType === tt._if ||\n    prevType === tt._for ||\n    prevType === tt._with ||\n    prevType === tt._while;\n  this.state.context.push(\n    statementParens ? types.parenStatement : types.parenExpression,\n  );\n  this.state.exprAllowed = true;\n};\n\ntt.incDec.updateContext = function() {\n  // tokExprAllowed stays unchanged\n};\n\ntt._function.updateContext = tt._class.updateContext = function(prevType) {\n  if (\n    prevType.beforeExpr &&\n    prevType !== tt.semi &&\n    prevType !== tt._else &&\n    !(\n      prevType === tt._return &&\n      lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start))\n    ) &&\n    !(\n      (prevType === tt.colon || prevType === tt.braceL) &&\n      this.curContext() === types.b_stat\n    )\n  ) {\n    this.state.context.push(types.functionExpression);\n  } else {\n    this.state.context.push(types.functionStatement);\n  }\n\n  this.state.exprAllowed = false;\n};\n\ntt.backQuote.updateContext = function() {\n  if (this.curContext() === types.template) {\n    this.state.context.pop();\n  } else {\n    this.state.context.push(types.template);\n  }\n  this.state.exprAllowed = false;\n};\n","// @flow\n\nimport * as charCodes from \"charcodes\";\n\n// ## Character categories\n\n// Big ugly regular expressions that match characters in the\n// whitespace, identifier, and identifier-start categories. These\n// are only applied when a character is found to actually have a\n// code point between 0x80 and 0xffff.\n// Generated by `scripts/generate-identifier-regex.js`.\n\n/* prettier-ignore */\nlet nonASCIIidentifierStartChars = \"\\xaa\\xb5\\xba\\xc0-\\xd6\\xd8-\\xf6\\xf8-\\u02c1\\u02c6-\\u02d1\\u02e0-\\u02e4\\u02ec\\u02ee\\u0370-\\u0374\\u0376\\u0377\\u037a-\\u037d\\u037f\\u0386\\u0388-\\u038a\\u038c\\u038e-\\u03a1\\u03a3-\\u03f5\\u03f7-\\u0481\\u048a-\\u052f\\u0531-\\u0556\\u0559\\u0560-\\u0588\\u05d0-\\u05ea\\u05ef-\\u05f2\\u0620-\\u064a\\u066e\\u066f\\u0671-\\u06d3\\u06d5\\u06e5\\u06e6\\u06ee\\u06ef\\u06fa-\\u06fc\\u06ff\\u0710\\u0712-\\u072f\\u074d-\\u07a5\\u07b1\\u07ca-\\u07ea\\u07f4\\u07f5\\u07fa\\u0800-\\u0815\\u081a\\u0824\\u0828\\u0840-\\u0858\\u0860-\\u086a\\u08a0-\\u08b4\\u08b6-\\u08c7\\u0904-\\u0939\\u093d\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098c\\u098f\\u0990\\u0993-\\u09a8\\u09aa-\\u09b0\\u09b2\\u09b6-\\u09b9\\u09bd\\u09ce\\u09dc\\u09dd\\u09df-\\u09e1\\u09f0\\u09f1\\u09fc\\u0a05-\\u0a0a\\u0a0f\\u0a10\\u0a13-\\u0a28\\u0a2a-\\u0a30\\u0a32\\u0a33\\u0a35\\u0a36\\u0a38\\u0a39\\u0a59-\\u0a5c\\u0a5e\\u0a72-\\u0a74\\u0a85-\\u0a8d\\u0a8f-\\u0a91\\u0a93-\\u0aa8\\u0aaa-\\u0ab0\\u0ab2\\u0ab3\\u0ab5-\\u0ab9\\u0abd\\u0ad0\\u0ae0\\u0ae1\\u0af9\\u0b05-\\u0b0c\\u0b0f\\u0b10\\u0b13-\\u0b28\\u0b2a-\\u0b30\\u0b32\\u0b33\\u0b35-\\u0b39\\u0b3d\\u0b5c\\u0b5d\\u0b5f-\\u0b61\\u0b71\\u0b83\\u0b85-\\u0b8a\\u0b8e-\\u0b90\\u0b92-\\u0b95\\u0b99\\u0b9a\\u0b9c\\u0b9e\\u0b9f\\u0ba3\\u0ba4\\u0ba8-\\u0baa\\u0bae-\\u0bb9\\u0bd0\\u0c05-\\u0c0c\\u0c0e-\\u0c10\\u0c12-\\u0c28\\u0c2a-\\u0c39\\u0c3d\\u0c58-\\u0c5a\\u0c60\\u0c61\\u0c80\\u0c85-\\u0c8c\\u0c8e-\\u0c90\\u0c92-\\u0ca8\\u0caa-\\u0cb3\\u0cb5-\\u0cb9\\u0cbd\\u0cde\\u0ce0\\u0ce1\\u0cf1\\u0cf2\\u0d04-\\u0d0c\\u0d0e-\\u0d10\\u0d12-\\u0d3a\\u0d3d\\u0d4e\\u0d54-\\u0d56\\u0d5f-\\u0d61\\u0d7a-\\u0d7f\\u0d85-\\u0d96\\u0d9a-\\u0db1\\u0db3-\\u0dbb\\u0dbd\\u0dc0-\\u0dc6\\u0e01-\\u0e30\\u0e32\\u0e33\\u0e40-\\u0e46\\u0e81\\u0e82\\u0e84\\u0e86-\\u0e8a\\u0e8c-\\u0ea3\\u0ea5\\u0ea7-\\u0eb0\\u0eb2\\u0eb3\\u0ebd\\u0ec0-\\u0ec4\\u0ec6\\u0edc-\\u0edf\\u0f00\\u0f40-\\u0f47\\u0f49-\\u0f6c\\u0f88-\\u0f8c\\u1000-\\u102a\\u103f\\u1050-\\u1055\\u105a-\\u105d\\u1061\\u1065\\u1066\\u106e-\\u1070\\u1075-\\u1081\\u108e\\u10a0-\\u10c5\\u10c7\\u10cd\\u10d0-\\u10fa\\u10fc-\\u1248\\u124a-\\u124d\\u1250-\\u1256\\u1258\\u125a-\\u125d\\u1260-\\u1288\\u128a-\\u128d\\u1290-\\u12b0\\u12b2-\\u12b5\\u12b8-\\u12be\\u12c0\\u12c2-\\u12c5\\u12c8-\\u12d6\\u12d8-\\u1310\\u1312-\\u1315\\u1318-\\u135a\\u1380-\\u138f\\u13a0-\\u13f5\\u13f8-\\u13fd\\u1401-\\u166c\\u166f-\\u167f\\u1681-\\u169a\\u16a0-\\u16ea\\u16ee-\\u16f8\\u1700-\\u170c\\u170e-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176c\\u176e-\\u1770\\u1780-\\u17b3\\u17d7\\u17dc\\u1820-\\u1878\\u1880-\\u18a8\\u18aa\\u18b0-\\u18f5\\u1900-\\u191e\\u1950-\\u196d\\u1970-\\u1974\\u1980-\\u19ab\\u19b0-\\u19c9\\u1a00-\\u1a16\\u1a20-\\u1a54\\u1aa7\\u1b05-\\u1b33\\u1b45-\\u1b4b\\u1b83-\\u1ba0\\u1bae\\u1baf\\u1bba-\\u1be5\\u1c00-\\u1c23\\u1c4d-\\u1c4f\\u1c5a-\\u1c7d\\u1c80-\\u1c88\\u1c90-\\u1cba\\u1cbd-\\u1cbf\\u1ce9-\\u1cec\\u1cee-\\u1cf3\\u1cf5\\u1cf6\\u1cfa\\u1d00-\\u1dbf\\u1e00-\\u1f15\\u1f18-\\u1f1d\\u1f20-\\u1f45\\u1f48-\\u1f4d\\u1f50-\\u1f57\\u1f59\\u1f5b\\u1f5d\\u1f5f-\\u1f7d\\u1f80-\\u1fb4\\u1fb6-\\u1fbc\\u1fbe\\u1fc2-\\u1fc4\\u1fc6-\\u1fcc\\u1fd0-\\u1fd3\\u1fd6-\\u1fdb\\u1fe0-\\u1fec\\u1ff2-\\u1ff4\\u1ff6-\\u1ffc\\u2071\\u207f\\u2090-\\u209c\\u2102\\u2107\\u210a-\\u2113\\u2115\\u2118-\\u211d\\u2124\\u2126\\u2128\\u212a-\\u2139\\u213c-\\u213f\\u2145-\\u2149\\u214e\\u2160-\\u2188\\u2c00-\\u2c2e\\u2c30-\\u2c5e\\u2c60-\\u2ce4\\u2ceb-\\u2cee\\u2cf2\\u2cf3\\u2d00-\\u2d25\\u2d27\\u2d2d\\u2d30-\\u2d67\\u2d6f\\u2d80-\\u2d96\\u2da0-\\u2da6\\u2da8-\\u2dae\\u2db0-\\u2db6\\u2db8-\\u2dbe\\u2dc0-\\u2dc6\\u2dc8-\\u2dce\\u2dd0-\\u2dd6\\u2dd8-\\u2dde\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303c\\u3041-\\u3096\\u309b-\\u309f\\u30a1-\\u30fa\\u30fc-\\u30ff\\u3105-\\u312f\\u3131-\\u318e\\u31a0-\\u31bf\\u31f0-\\u31ff\\u3400-\\u4dbf\\u4e00-\\u9ffc\\ua000-\\ua48c\\ua4d0-\\ua4fd\\ua500-\\ua60c\\ua610-\\ua61f\\ua62a\\ua62b\\ua640-\\ua66e\\ua67f-\\ua69d\\ua6a0-\\ua6ef\\ua717-\\ua71f\\ua722-\\ua788\\ua78b-\\ua7bf\\ua7c2-\\ua7ca\\ua7f5-\\ua801\\ua803-\\ua805\\ua807-\\ua80a\\ua80c-\\ua822\\ua840-\\ua873\\ua882-\\ua8b3\\ua8f2-\\ua8f7\\ua8fb\\ua8fd\\ua8fe\\ua90a-\\ua925\\ua930-\\ua946\\ua960-\\ua97c\\ua984-\\ua9b2\\ua9cf\\ua9e0-\\ua9e4\\ua9e6-\\ua9ef\\ua9fa-\\ua9fe\\uaa00-\\uaa28\\uaa40-\\uaa42\\uaa44-\\uaa4b\\uaa60-\\uaa76\\uaa7a\\uaa7e-\\uaaaf\\uaab1\\uaab5\\uaab6\\uaab9-\\uaabd\\uaac0\\uaac2\\uaadb-\\uaadd\\uaae0-\\uaaea\\uaaf2-\\uaaf4\\uab01-\\uab06\\uab09-\\uab0e\\uab11-\\uab16\\uab20-\\uab26\\uab28-\\uab2e\\uab30-\\uab5a\\uab5c-\\uab69\\uab70-\\uabe2\\uac00-\\ud7a3\\ud7b0-\\ud7c6\\ud7cb-\\ud7fb\\uf900-\\ufa6d\\ufa70-\\ufad9\\ufb00-\\ufb06\\ufb13-\\ufb17\\ufb1d\\ufb1f-\\ufb28\\ufb2a-\\ufb36\\ufb38-\\ufb3c\\ufb3e\\ufb40\\ufb41\\ufb43\\ufb44\\ufb46-\\ufbb1\\ufbd3-\\ufd3d\\ufd50-\\ufd8f\\ufd92-\\ufdc7\\ufdf0-\\ufdfb\\ufe70-\\ufe74\\ufe76-\\ufefc\\uff21-\\uff3a\\uff41-\\uff5a\\uff66-\\uffbe\\uffc2-\\uffc7\\uffca-\\uffcf\\uffd2-\\uffd7\\uffda-\\uffdc\";\n/* prettier-ignore */\nlet nonASCIIidentifierChars = \"\\u200c\\u200d\\xb7\\u0300-\\u036f\\u0387\\u0483-\\u0487\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u064b-\\u0669\\u0670\\u06d6-\\u06dc\\u06df-\\u06e4\\u06e7\\u06e8\\u06ea-\\u06ed\\u06f0-\\u06f9\\u0711\\u0730-\\u074a\\u07a6-\\u07b0\\u07c0-\\u07c9\\u07eb-\\u07f3\\u07fd\\u0816-\\u0819\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0859-\\u085b\\u08d3-\\u08e1\\u08e3-\\u0903\\u093a-\\u093c\\u093e-\\u094f\\u0951-\\u0957\\u0962\\u0963\\u0966-\\u096f\\u0981-\\u0983\\u09bc\\u09be-\\u09c4\\u09c7\\u09c8\\u09cb-\\u09cd\\u09d7\\u09e2\\u09e3\\u09e6-\\u09ef\\u09fe\\u0a01-\\u0a03\\u0a3c\\u0a3e-\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a66-\\u0a71\\u0a75\\u0a81-\\u0a83\\u0abc\\u0abe-\\u0ac5\\u0ac7-\\u0ac9\\u0acb-\\u0acd\\u0ae2\\u0ae3\\u0ae6-\\u0aef\\u0afa-\\u0aff\\u0b01-\\u0b03\\u0b3c\\u0b3e-\\u0b44\\u0b47\\u0b48\\u0b4b-\\u0b4d\\u0b55-\\u0b57\\u0b62\\u0b63\\u0b66-\\u0b6f\\u0b82\\u0bbe-\\u0bc2\\u0bc6-\\u0bc8\\u0bca-\\u0bcd\\u0bd7\\u0be6-\\u0bef\\u0c00-\\u0c04\\u0c3e-\\u0c44\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62\\u0c63\\u0c66-\\u0c6f\\u0c81-\\u0c83\\u0cbc\\u0cbe-\\u0cc4\\u0cc6-\\u0cc8\\u0cca-\\u0ccd\\u0cd5\\u0cd6\\u0ce2\\u0ce3\\u0ce6-\\u0cef\\u0d00-\\u0d03\\u0d3b\\u0d3c\\u0d3e-\\u0d44\\u0d46-\\u0d48\\u0d4a-\\u0d4d\\u0d57\\u0d62\\u0d63\\u0d66-\\u0d6f\\u0d81-\\u0d83\\u0dca\\u0dcf-\\u0dd4\\u0dd6\\u0dd8-\\u0ddf\\u0de6-\\u0def\\u0df2\\u0df3\\u0e31\\u0e34-\\u0e3a\\u0e47-\\u0e4e\\u0e50-\\u0e59\\u0eb1\\u0eb4-\\u0ebc\\u0ec8-\\u0ecd\\u0ed0-\\u0ed9\\u0f18\\u0f19\\u0f20-\\u0f29\\u0f35\\u0f37\\u0f39\\u0f3e\\u0f3f\\u0f71-\\u0f84\\u0f86\\u0f87\\u0f8d-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u102b-\\u103e\\u1040-\\u1049\\u1056-\\u1059\\u105e-\\u1060\\u1062-\\u1064\\u1067-\\u106d\\u1071-\\u1074\\u1082-\\u108d\\u108f-\\u109d\\u135d-\\u135f\\u1369-\\u1371\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17b4-\\u17d3\\u17dd\\u17e0-\\u17e9\\u180b-\\u180d\\u1810-\\u1819\\u18a9\\u1920-\\u192b\\u1930-\\u193b\\u1946-\\u194f\\u19d0-\\u19da\\u1a17-\\u1a1b\\u1a55-\\u1a5e\\u1a60-\\u1a7c\\u1a7f-\\u1a89\\u1a90-\\u1a99\\u1ab0-\\u1abd\\u1abf\\u1ac0\\u1b00-\\u1b04\\u1b34-\\u1b44\\u1b50-\\u1b59\\u1b6b-\\u1b73\\u1b80-\\u1b82\\u1ba1-\\u1bad\\u1bb0-\\u1bb9\\u1be6-\\u1bf3\\u1c24-\\u1c37\\u1c40-\\u1c49\\u1c50-\\u1c59\\u1cd0-\\u1cd2\\u1cd4-\\u1ce8\\u1ced\\u1cf4\\u1cf7-\\u1cf9\\u1dc0-\\u1df9\\u1dfb-\\u1dff\\u203f\\u2040\\u2054\\u20d0-\\u20dc\\u20e1\\u20e5-\\u20f0\\u2cef-\\u2cf1\\u2d7f\\u2de0-\\u2dff\\u302a-\\u302f\\u3099\\u309a\\ua620-\\ua629\\ua66f\\ua674-\\ua67d\\ua69e\\ua69f\\ua6f0\\ua6f1\\ua802\\ua806\\ua80b\\ua823-\\ua827\\ua82c\\ua880\\ua881\\ua8b4-\\ua8c5\\ua8d0-\\ua8d9\\ua8e0-\\ua8f1\\ua8ff-\\ua909\\ua926-\\ua92d\\ua947-\\ua953\\ua980-\\ua983\\ua9b3-\\ua9c0\\ua9d0-\\ua9d9\\ua9e5\\ua9f0-\\ua9f9\\uaa29-\\uaa36\\uaa43\\uaa4c\\uaa4d\\uaa50-\\uaa59\\uaa7b-\\uaa7d\\uaab0\\uaab2-\\uaab4\\uaab7\\uaab8\\uaabe\\uaabf\\uaac1\\uaaeb-\\uaaef\\uaaf5\\uaaf6\\uabe3-\\uabea\\uabec\\uabed\\uabf0-\\uabf9\\ufb1e\\ufe00-\\ufe0f\\ufe20-\\ufe2f\\ufe33\\ufe34\\ufe4d-\\ufe4f\\uff10-\\uff19\\uff3f\";\n\nconst nonASCIIidentifierStart = new RegExp(\n  \"[\" + nonASCIIidentifierStartChars + \"]\",\n);\nconst nonASCIIidentifier = new RegExp(\n  \"[\" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + \"]\",\n);\n\nnonASCIIidentifierStartChars = nonASCIIidentifierChars = null;\n\n// These are a run-length and offset-encoded representation of the\n// >0xffff code points that are a valid part of identifiers. The\n// offset starts at 0x10000, and each pair of numbers represents an\n// offset to the next range, and then a size of the range. They were\n// generated by `scripts/generate-identifier-regex.js`.\n/* prettier-ignore */\n/* prettier-ignore */\nconst astralIdentifierStartCodes = [0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,14,29,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,28,43,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,14,35,349,41,7,1,79,28,11,0,9,21,107,20,28,22,13,52,76,44,33,24,27,35,30,0,3,0,9,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,21,2,31,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,14,0,72,26,230,43,117,63,32,7,3,0,3,7,2,1,2,23,16,0,2,0,95,7,3,38,17,0,2,0,29,0,11,39,8,0,22,0,12,45,20,0,35,56,264,8,2,36,18,0,50,29,113,6,2,1,2,37,22,0,26,5,2,1,2,31,15,0,328,18,190,0,80,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,689,63,129,74,6,0,67,12,65,1,2,0,29,6135,9,1237,43,8,8952,286,50,2,18,3,9,395,2309,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,2357,44,11,6,17,0,370,43,1301,196,60,67,8,0,1205,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42717,35,4148,12,221,3,5761,15,7472,3104,541,1507,4938];\n/* prettier-ignore */\nconst astralIdentifierCodes = [509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,574,3,9,9,370,1,154,10,176,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,6,1,45,0,13,2,49,13,9,3,2,11,83,11,7,0,161,11,6,9,7,3,56,1,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,5,0,82,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,243,14,166,9,71,5,2,1,3,3,2,0,2,1,13,9,120,6,3,6,4,0,29,9,41,6,2,3,9,0,10,10,47,15,406,7,2,7,17,9,57,21,2,13,123,5,4,0,2,1,2,6,2,0,9,9,49,4,2,1,2,4,9,9,330,3,19306,9,135,4,60,6,26,9,1014,0,2,54,8,3,82,0,12,1,19628,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,262,6,10,9,419,13,1495,6,110,6,6,9,4759,9,787719,239];\n\n// This has a complexity linear to the value of the code. The\n// assumption is that looking up astral identifier characters is\n// rare.\nfunction isInAstralSet(code: number, set: $ReadOnlyArray<number>): boolean {\n  let pos = 0x10000;\n  for (let i = 0, length = set.length; i < length; i += 2) {\n    pos += set[i];\n    if (pos > code) return false;\n\n    pos += set[i + 1];\n    if (pos >= code) return true;\n  }\n  return false;\n}\n\n// Test whether a given character code starts an identifier.\n\nexport function isIdentifierStart(code: number): boolean {\n  if (code < charCodes.uppercaseA) return code === charCodes.dollarSign;\n  if (code <= charCodes.uppercaseZ) return true;\n  if (code < charCodes.lowercaseA) return code === charCodes.underscore;\n  if (code <= charCodes.lowercaseZ) return true;\n  if (code <= 0xffff) {\n    return (\n      code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code))\n    );\n  }\n  return isInAstralSet(code, astralIdentifierStartCodes);\n}\n\n// Test whether a given character is part of an identifier.\n\nexport function isIdentifierChar(code: number): boolean {\n  if (code < charCodes.digit0) return code === charCodes.dollarSign;\n  if (code < charCodes.colon) return true;\n  if (code < charCodes.uppercaseA) return false;\n  if (code <= charCodes.uppercaseZ) return true;\n  if (code < charCodes.lowercaseA) return code === charCodes.underscore;\n  if (code <= charCodes.lowercaseZ) return true;\n  if (code <= 0xffff) {\n    return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));\n  }\n  return (\n    isInAstralSet(code, astralIdentifierStartCodes) ||\n    isInAstralSet(code, astralIdentifierCodes)\n  );\n}\n\n// Test whether a given string is a valid identifier name\n\nexport function isIdentifierName(name: string): boolean {\n  let isFirst = true;\n  for (const char of Array.from(name)) {\n    const cp = char.codePointAt(0);\n    if (isFirst) {\n      if (!isIdentifierStart(cp)) {\n        return false;\n      }\n      isFirst = false;\n    } else if (!isIdentifierChar(cp)) {\n      return false;\n    }\n  }\n  return true;\n}\n","// @flow\n\nconst reservedWords = {\n  keyword: [\n    \"break\",\n    \"case\",\n    \"catch\",\n    \"continue\",\n    \"debugger\",\n    \"default\",\n    \"do\",\n    \"else\",\n    \"finally\",\n    \"for\",\n    \"function\",\n    \"if\",\n    \"return\",\n    \"switch\",\n    \"throw\",\n    \"try\",\n    \"var\",\n    \"const\",\n    \"while\",\n    \"with\",\n    \"new\",\n    \"this\",\n    \"super\",\n    \"class\",\n    \"extends\",\n    \"export\",\n    \"import\",\n    \"null\",\n    \"true\",\n    \"false\",\n    \"in\",\n    \"instanceof\",\n    \"typeof\",\n    \"void\",\n    \"delete\",\n  ],\n  strict: [\n    \"implements\",\n    \"interface\",\n    \"let\",\n    \"package\",\n    \"private\",\n    \"protected\",\n    \"public\",\n    \"static\",\n    \"yield\",\n  ],\n  strictBind: [\"eval\", \"arguments\"],\n};\nconst keywords = new Set(reservedWords.keyword);\nconst reservedWordsStrictSet = new Set(reservedWords.strict);\nconst reservedWordsStrictBindSet = new Set(reservedWords.strictBind);\n\n/**\n * Checks if word is a reserved word in non-strict mode\n */\nexport function isReservedWord(word: string, inModule: boolean): boolean {\n  return (inModule && word === \"await\") || word === \"enum\";\n}\n\n/**\n * Checks if word is a reserved word in non-binding strict mode\n *\n * Includes non-strict reserved words\n */\nexport function isStrictReservedWord(word: string, inModule: boolean): boolean {\n  return isReservedWord(word, inModule) || reservedWordsStrictSet.has(word);\n}\n\n/**\n * Checks if word is a reserved word in binding strict mode, but it is allowed as\n * a normal identifier.\n */\nexport function isStrictBindOnlyReservedWord(word: string): boolean {\n  return reservedWordsStrictBindSet.has(word);\n}\n\n/**\n * Checks if word is a reserved word in binding strict mode\n *\n * Includes non-strict reserved words and non-binding strict reserved words\n */\nexport function isStrictBindReservedWord(\n  word: string,\n  inModule: boolean,\n): boolean {\n  return (\n    isStrictReservedWord(word, inModule) || isStrictBindOnlyReservedWord(word)\n  );\n}\n\nexport function isKeyword(word: string): boolean {\n  return keywords.has(word);\n}\n","/* eslint max-len: 0 */\n\n// @flow\n\nimport * as charCodes from \"charcodes\";\n\nexport {\n  isIdentifierStart,\n  isIdentifierChar,\n  isReservedWord,\n  isStrictBindOnlyReservedWord,\n  isStrictBindReservedWord,\n  isStrictReservedWord,\n  isKeyword,\n} from \"@babel/helper-validator-identifier\";\n\nexport const keywordRelationalOperator = /^in(stanceof)?$/;\n\n// Test whether a current state character code and next character code is @\n\nexport function isIteratorStart(current: number, next: number): boolean {\n  return current === charCodes.atSign && next === charCodes.atSign;\n}\n","// @flow\n\n/*:: declare var invariant; */\n\nimport type Parser from \"../parser\";\nimport { types as tt, type TokenType } from \"../tokenizer/types\";\nimport * as N from \"../types\";\nimport type { Options } from \"../options\";\nimport type { Pos, Position } from \"../util/location\";\nimport type State from \"../tokenizer/state\";\nimport { types as tc } from \"../tokenizer/context\";\nimport * as charCodes from \"charcodes\";\nimport { isIteratorStart } from \"../util/identifier\";\nimport {\n  type BindingTypes,\n  BIND_NONE,\n  BIND_LEXICAL,\n  BIND_VAR,\n  BIND_FUNCTION,\n  SCOPE_ARROW,\n  SCOPE_FUNCTION,\n  SCOPE_OTHER,\n} from \"../util/scopeflags\";\nimport type { ExpressionErrors } from \"../parser/util\";\nimport { Errors } from \"../parser/location\";\n\nconst reservedTypes = new Set([\n  \"_\",\n  \"any\",\n  \"bool\",\n  \"boolean\",\n  \"empty\",\n  \"extends\",\n  \"false\",\n  \"interface\",\n  \"mixed\",\n  \"null\",\n  \"number\",\n  \"static\",\n  \"string\",\n  \"true\",\n  \"typeof\",\n  \"void\",\n]);\n\n/* eslint sort-keys: \"error\" */\n// The Errors key follows https://github.com/facebook/flow/blob/master/src/parser/parse_error.ml unless it does not exist\nconst FlowErrors = Object.freeze({\n  AmbiguousConditionalArrow:\n    \"Ambiguous expression: wrap the arrow functions in parentheses to disambiguate.\",\n  AmbiguousDeclareModuleKind:\n    \"Found both `declare module.exports` and `declare export` in the same module. Modules can only have 1 since they are either an ES module or they are a CommonJS module\",\n  AssignReservedType: \"Cannot overwrite reserved type %0\",\n  DeclareClassElement:\n    \"The `declare` modifier can only appear on class fields.\",\n  DeclareClassFieldInitializer:\n    \"Initializers are not allowed in fields with the `declare` modifier.\",\n  DuplicateDeclareModuleExports: \"Duplicate `declare module.exports` statement\",\n  EnumBooleanMemberNotInitialized:\n    \"Boolean enum members need to be initialized. Use either `%0 = true,` or `%0 = false,` in enum `%1`.\",\n  EnumDuplicateMemberName:\n    \"Enum member names need to be unique, but the name `%0` has already been used before in enum `%1`.\",\n  EnumInconsistentMemberValues:\n    \"Enum `%0` has inconsistent member initializers. Either use no initializers, or consistently use literals (either booleans, numbers, or strings) for all member initializers.\",\n  EnumInvalidExplicitType:\n    \"Enum type `%1` is not valid. Use one of `boolean`, `number`, `string`, or `symbol` in enum `%0`.\",\n  EnumInvalidExplicitTypeUnknownSupplied:\n    \"Supplied enum type is not valid. Use one of `boolean`, `number`, `string`, or `symbol` in enum `%0`.\",\n  EnumInvalidMemberInitializerPrimaryType:\n    \"Enum `%0` has type `%2`, so the initializer of `%1` needs to be a %2 literal.\",\n  EnumInvalidMemberInitializerSymbolType:\n    \"Symbol enum members cannot be initialized. Use `%1,` in enum `%0`.\",\n  EnumInvalidMemberInitializerUnknownType:\n    \"The enum member initializer for `%1` needs to be a literal (either a boolean, number, or string) in enum `%0`.\",\n  EnumInvalidMemberName:\n    \"Enum member names cannot start with lowercase 'a' through 'z'. Instead of using `%0`, consider using `%1`, in enum `%2`.\",\n  EnumNumberMemberNotInitialized:\n    \"Number enum members need to be initialized, e.g. `%1 = 1` in enum `%0`.\",\n  EnumStringMemberInconsistentlyInitailized:\n    \"String enum members need to consistently either all use initializers, or use no initializers, in enum `%0`.\",\n  ImportTypeShorthandOnlyInPureImport:\n    \"The `type` and `typeof` keywords on named imports can only be used on regular `import` statements. It cannot be used with `import type` or `import typeof` statements\",\n  InexactInsideExact:\n    \"Explicit inexact syntax cannot appear inside an explicit exact object type\",\n  InexactInsideNonObject:\n    \"Explicit inexact syntax cannot appear in class or interface definitions\",\n  InexactVariance: \"Explicit inexact syntax cannot have variance\",\n  InvalidNonTypeImportInDeclareModule:\n    \"Imports within a `declare module` body must always be `import type` or `import typeof`\",\n  MissingTypeParamDefault:\n    \"Type parameter declaration needs a default, since a preceding type parameter declaration has a default.\",\n  NestedDeclareModule:\n    \"`declare module` cannot be used inside another `declare module`\",\n  NestedFlowComment: \"Cannot have a flow comment inside another flow comment\",\n  OptionalBindingPattern:\n    \"A binding pattern parameter cannot be optional in an implementation signature.\",\n  SpreadVariance: \"Spread properties cannot have variance\",\n  TypeBeforeInitializer:\n    \"Type annotations must come before default assignments, e.g. instead of `age = 25: number` use `age: number = 25`\",\n  TypeCastInPattern:\n    \"The type cast expression is expected to be wrapped with parenthesis\",\n  UnexpectedExplicitInexactInObject:\n    \"Explicit inexact syntax must appear at the end of an inexact object\",\n  UnexpectedReservedType: \"Unexpected reserved type %0\",\n  UnexpectedReservedUnderscore:\n    \"`_` is only allowed as a type argument to call or new\",\n  UnexpectedSpaceBetweenModuloChecks:\n    \"Spaces between `%` and `checks` are not allowed here.\",\n  UnexpectedSpreadType:\n    \"Spread operator cannot appear in class or interface definitions\",\n  UnexpectedSubtractionOperand:\n    'Unexpected token, expected \"number\" or \"bigint\"',\n  UnexpectedTokenAfterTypeParameter:\n    \"Expected an arrow function after this type parameter declaration\",\n  UnsupportedDeclareExportKind:\n    \"`declare export %0` is not supported. Use `%1` instead\",\n  UnsupportedStatementInDeclareModule:\n    \"Only declares and type imports are allowed inside declare module\",\n  UnterminatedFlowComment: \"Unterminated flow-comment\",\n});\n/* eslint-disable sort-keys */\n\nfunction isEsModuleType(bodyElement: N.Node): boolean {\n  return (\n    bodyElement.type === \"DeclareExportAllDeclaration\" ||\n    (bodyElement.type === \"DeclareExportDeclaration\" &&\n      (!bodyElement.declaration ||\n        (bodyElement.declaration.type !== \"TypeAlias\" &&\n          bodyElement.declaration.type !== \"InterfaceDeclaration\")))\n  );\n}\n\nfunction hasTypeImportKind(node: N.Node): boolean {\n  return node.importKind === \"type\" || node.importKind === \"typeof\";\n}\n\nfunction isMaybeDefaultImport(state: State): boolean {\n  return (\n    (state.type === tt.name || !!state.type.keyword) && state.value !== \"from\"\n  );\n}\n\nconst exportSuggestions = {\n  const: \"declare export var\",\n  let: \"declare export var\",\n  type: \"export type\",\n  interface: \"export interface\",\n};\n\n// Like Array#filter, but returns a tuple [ acceptedElements, discardedElements ]\nfunction partition<T>(\n  list: T[],\n  test: (T, number, T[]) => ?boolean,\n): [T[], T[]] {\n  const list1 = [];\n  const list2 = [];\n  for (let i = 0; i < list.length; i++) {\n    (test(list[i], i, list) ? list1 : list2).push(list[i]);\n  }\n  return [list1, list2];\n}\n\nconst FLOW_PRAGMA_REGEX = /\\*?\\s*@((?:no)?flow)\\b/;\n\n// Flow enums types\ntype EnumExplicitType = null | \"boolean\" | \"number\" | \"string\" | \"symbol\";\ntype EnumContext = {|\n  enumName: string,\n  explicitType: EnumExplicitType,\n  memberName: string,\n|};\ntype EnumMemberInit =\n  | {| type: \"number\", pos: number, value: N.Node |}\n  | {| type: \"string\", pos: number, value: N.Node |}\n  | {| type: \"boolean\", pos: number, value: N.Node |}\n  | {| type: \"invalid\", pos: number |}\n  | {| type: \"none\", pos: number |};\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    // The value of the @flow/@noflow pragma. Initially undefined, transitions\n    // to \"@flow\" or \"@noflow\" if we see a pragma. Transitions to null if we are\n    // past the initial comment.\n    flowPragma: void | null | \"flow\" | \"noflow\";\n\n    constructor(options: ?Options, input: string) {\n      super(options, input);\n      this.flowPragma = undefined;\n    }\n\n    shouldParseTypes(): boolean {\n      return this.getPluginOption(\"flow\", \"all\") || this.flowPragma === \"flow\";\n    }\n\n    shouldParseEnums(): boolean {\n      return !!this.getPluginOption(\"flow\", \"enums\");\n    }\n\n    finishToken(type: TokenType, val: any): void {\n      if (\n        type !== tt.string &&\n        type !== tt.semi &&\n        type !== tt.interpreterDirective\n      ) {\n        if (this.flowPragma === undefined) {\n          this.flowPragma = null;\n        }\n      }\n      return super.finishToken(type, val);\n    }\n\n    addComment(comment: N.Comment): void {\n      if (this.flowPragma === undefined) {\n        // Try to parse a flow pragma.\n        const matches = FLOW_PRAGMA_REGEX.exec(comment.value);\n        if (!matches) {\n          // do nothing\n        } else if (matches[1] === \"flow\") {\n          this.flowPragma = \"flow\";\n        } else if (matches[1] === \"noflow\") {\n          this.flowPragma = \"noflow\";\n        } else {\n          throw new Error(\"Unexpected flow pragma\");\n        }\n      }\n      return super.addComment(comment);\n    }\n\n    flowParseTypeInitialiser(tok?: TokenType): N.FlowType {\n      const oldInType = this.state.inType;\n      this.state.inType = true;\n      this.expect(tok || tt.colon);\n\n      const type = this.flowParseType();\n      this.state.inType = oldInType;\n      return type;\n    }\n\n    flowParsePredicate(): N.FlowType {\n      const node = this.startNode();\n      const moduloLoc = this.state.startLoc;\n      const moduloPos = this.state.start;\n      this.expect(tt.modulo);\n      const checksLoc = this.state.startLoc;\n      this.expectContextual(\"checks\");\n      // Force '%' and 'checks' to be adjacent\n      if (\n        moduloLoc.line !== checksLoc.line ||\n        moduloLoc.column !== checksLoc.column - 1\n      ) {\n        this.raise(moduloPos, FlowErrors.UnexpectedSpaceBetweenModuloChecks);\n      }\n      if (this.eat(tt.parenL)) {\n        node.value = this.parseExpression();\n        this.expect(tt.parenR);\n        return this.finishNode(node, \"DeclaredPredicate\");\n      } else {\n        return this.finishNode(node, \"InferredPredicate\");\n      }\n    }\n\n    flowParseTypeAndPredicateInitialiser(): [?N.FlowType, ?N.FlowPredicate] {\n      const oldInType = this.state.inType;\n      this.state.inType = true;\n      this.expect(tt.colon);\n      let type = null;\n      let predicate = null;\n      if (this.match(tt.modulo)) {\n        this.state.inType = oldInType;\n        predicate = this.flowParsePredicate();\n      } else {\n        type = this.flowParseType();\n        this.state.inType = oldInType;\n        if (this.match(tt.modulo)) {\n          predicate = this.flowParsePredicate();\n        }\n      }\n      return [type, predicate];\n    }\n\n    flowParseDeclareClass(node: N.FlowDeclareClass): N.FlowDeclareClass {\n      this.next();\n      this.flowParseInterfaceish(node, /*isClass*/ true);\n      return this.finishNode(node, \"DeclareClass\");\n    }\n\n    flowParseDeclareFunction(\n      node: N.FlowDeclareFunction,\n    ): N.FlowDeclareFunction {\n      this.next();\n\n      const id = (node.id = this.parseIdentifier());\n\n      const typeNode = this.startNode();\n      const typeContainer = this.startNode();\n\n      if (this.isRelational(\"<\")) {\n        typeNode.typeParameters = this.flowParseTypeParameterDeclaration();\n      } else {\n        typeNode.typeParameters = null;\n      }\n\n      this.expect(tt.parenL);\n      const tmp = this.flowParseFunctionTypeParams();\n      typeNode.params = tmp.params;\n      typeNode.rest = tmp.rest;\n      this.expect(tt.parenR);\n\n      [\n        // $FlowFixMe (destructuring not supported yet)\n        typeNode.returnType,\n        // $FlowFixMe (destructuring not supported yet)\n        node.predicate,\n      ] = this.flowParseTypeAndPredicateInitialiser();\n\n      typeContainer.typeAnnotation = this.finishNode(\n        typeNode,\n        \"FunctionTypeAnnotation\",\n      );\n\n      id.typeAnnotation = this.finishNode(typeContainer, \"TypeAnnotation\");\n\n      this.resetEndLocation(id);\n      this.semicolon();\n\n      return this.finishNode(node, \"DeclareFunction\");\n    }\n\n    flowParseDeclare(\n      node: N.FlowDeclare,\n      insideModule?: boolean,\n    ): N.FlowDeclare {\n      if (this.match(tt._class)) {\n        return this.flowParseDeclareClass(node);\n      } else if (this.match(tt._function)) {\n        return this.flowParseDeclareFunction(node);\n      } else if (this.match(tt._var)) {\n        return this.flowParseDeclareVariable(node);\n      } else if (this.eatContextual(\"module\")) {\n        if (this.match(tt.dot)) {\n          return this.flowParseDeclareModuleExports(node);\n        } else {\n          if (insideModule) {\n            this.raise(this.state.lastTokStart, FlowErrors.NestedDeclareModule);\n          }\n          return this.flowParseDeclareModule(node);\n        }\n      } else if (this.isContextual(\"type\")) {\n        return this.flowParseDeclareTypeAlias(node);\n      } else if (this.isContextual(\"opaque\")) {\n        return this.flowParseDeclareOpaqueType(node);\n      } else if (this.isContextual(\"interface\")) {\n        return this.flowParseDeclareInterface(node);\n      } else if (this.match(tt._export)) {\n        return this.flowParseDeclareExportDeclaration(node, insideModule);\n      } else {\n        throw this.unexpected();\n      }\n    }\n\n    flowParseDeclareVariable(\n      node: N.FlowDeclareVariable,\n    ): N.FlowDeclareVariable {\n      this.next();\n      node.id = this.flowParseTypeAnnotatableIdentifier(\n        /*allowPrimitiveOverride*/ true,\n      );\n      this.scope.declareName(node.id.name, BIND_VAR, node.id.start);\n      this.semicolon();\n      return this.finishNode(node, \"DeclareVariable\");\n    }\n\n    flowParseDeclareModule(node: N.FlowDeclareModule): N.FlowDeclareModule {\n      this.scope.enter(SCOPE_OTHER);\n\n      if (this.match(tt.string)) {\n        node.id = this.parseExprAtom();\n      } else {\n        node.id = this.parseIdentifier();\n      }\n\n      const bodyNode = (node.body = this.startNode());\n      const body = (bodyNode.body = []);\n      this.expect(tt.braceL);\n      while (!this.match(tt.braceR)) {\n        let bodyNode = this.startNode();\n\n        if (this.match(tt._import)) {\n          this.next();\n          if (!this.isContextual(\"type\") && !this.match(tt._typeof)) {\n            this.raise(\n              this.state.lastTokStart,\n              FlowErrors.InvalidNonTypeImportInDeclareModule,\n            );\n          }\n          this.parseImport(bodyNode);\n        } else {\n          this.expectContextual(\n            \"declare\",\n            FlowErrors.UnsupportedStatementInDeclareModule,\n          );\n\n          bodyNode = this.flowParseDeclare(bodyNode, true);\n        }\n\n        body.push(bodyNode);\n      }\n\n      this.scope.exit();\n\n      this.expect(tt.braceR);\n\n      this.finishNode(bodyNode, \"BlockStatement\");\n\n      let kind = null;\n      let hasModuleExport = false;\n      body.forEach(bodyElement => {\n        if (isEsModuleType(bodyElement)) {\n          if (kind === \"CommonJS\") {\n            this.raise(\n              bodyElement.start,\n              FlowErrors.AmbiguousDeclareModuleKind,\n            );\n          }\n          kind = \"ES\";\n        } else if (bodyElement.type === \"DeclareModuleExports\") {\n          if (hasModuleExport) {\n            this.raise(\n              bodyElement.start,\n              FlowErrors.DuplicateDeclareModuleExports,\n            );\n          }\n          if (kind === \"ES\") {\n            this.raise(\n              bodyElement.start,\n              FlowErrors.AmbiguousDeclareModuleKind,\n            );\n          }\n          kind = \"CommonJS\";\n          hasModuleExport = true;\n        }\n      });\n\n      node.kind = kind || \"CommonJS\";\n      return this.finishNode(node, \"DeclareModule\");\n    }\n\n    flowParseDeclareExportDeclaration(\n      node: N.FlowDeclareExportDeclaration,\n      insideModule: ?boolean,\n    ): N.FlowDeclareExportDeclaration {\n      this.expect(tt._export);\n\n      if (this.eat(tt._default)) {\n        if (this.match(tt._function) || this.match(tt._class)) {\n          // declare export default class ...\n          // declare export default function ...\n          node.declaration = this.flowParseDeclare(this.startNode());\n        } else {\n          // declare export default [type];\n          node.declaration = this.flowParseType();\n          this.semicolon();\n        }\n        node.default = true;\n\n        return this.finishNode(node, \"DeclareExportDeclaration\");\n      } else {\n        if (\n          this.match(tt._const) ||\n          this.isLet() ||\n          ((this.isContextual(\"type\") || this.isContextual(\"interface\")) &&\n            !insideModule)\n        ) {\n          const label = this.state.value;\n          const suggestion = exportSuggestions[label];\n          throw this.raise(\n            this.state.start,\n            FlowErrors.UnsupportedDeclareExportKind,\n            label,\n            suggestion,\n          );\n        }\n\n        if (\n          this.match(tt._var) || // declare export var ...\n          this.match(tt._function) || // declare export function ...\n          this.match(tt._class) || // declare export class ...\n          this.isContextual(\"opaque\") // declare export opaque ..\n        ) {\n          node.declaration = this.flowParseDeclare(this.startNode());\n          node.default = false;\n\n          return this.finishNode(node, \"DeclareExportDeclaration\");\n        } else if (\n          this.match(tt.star) || // declare export * from ''\n          this.match(tt.braceL) || // declare export {} ...\n          this.isContextual(\"interface\") || // declare export interface ...\n          this.isContextual(\"type\") || // declare export type ...\n          this.isContextual(\"opaque\") // declare export opaque type ...\n        ) {\n          node = this.parseExport(node);\n          if (node.type === \"ExportNamedDeclaration\") {\n            // flow does not support the ExportNamedDeclaration\n            // $FlowIgnore\n            node.type = \"ExportDeclaration\";\n            // $FlowFixMe\n            node.default = false;\n            delete node.exportKind;\n          }\n\n          // $FlowIgnore\n          node.type = \"Declare\" + node.type;\n\n          return node;\n        }\n      }\n\n      throw this.unexpected();\n    }\n\n    flowParseDeclareModuleExports(\n      node: N.FlowDeclareModuleExports,\n    ): N.FlowDeclareModuleExports {\n      this.next();\n      this.expectContextual(\"exports\");\n      node.typeAnnotation = this.flowParseTypeAnnotation();\n      this.semicolon();\n\n      return this.finishNode(node, \"DeclareModuleExports\");\n    }\n\n    flowParseDeclareTypeAlias(\n      node: N.FlowDeclareTypeAlias,\n    ): N.FlowDeclareTypeAlias {\n      this.next();\n      this.flowParseTypeAlias(node);\n      // Don't do finishNode as we don't want to process comments twice\n      node.type = \"DeclareTypeAlias\";\n      return node;\n    }\n\n    flowParseDeclareOpaqueType(\n      node: N.FlowDeclareOpaqueType,\n    ): N.FlowDeclareOpaqueType {\n      this.next();\n      this.flowParseOpaqueType(node, true);\n      // Don't do finishNode as we don't want to process comments twice\n      node.type = \"DeclareOpaqueType\";\n      return node;\n    }\n\n    flowParseDeclareInterface(\n      node: N.FlowDeclareInterface,\n    ): N.FlowDeclareInterface {\n      this.next();\n      this.flowParseInterfaceish(node);\n      return this.finishNode(node, \"DeclareInterface\");\n    }\n\n    // Interfaces\n\n    flowParseInterfaceish(\n      node: N.FlowDeclare,\n      isClass?: boolean = false,\n    ): void {\n      node.id = this.flowParseRestrictedIdentifier(\n        /* liberal */ !isClass,\n        /* declaration */ true,\n      );\n\n      this.scope.declareName(\n        node.id.name,\n        isClass ? BIND_FUNCTION : BIND_LEXICAL,\n        node.id.start,\n      );\n\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      } else {\n        node.typeParameters = null;\n      }\n\n      node.extends = [];\n      node.implements = [];\n      node.mixins = [];\n\n      if (this.eat(tt._extends)) {\n        do {\n          node.extends.push(this.flowParseInterfaceExtends());\n        } while (!isClass && this.eat(tt.comma));\n      }\n\n      if (this.isContextual(\"mixins\")) {\n        this.next();\n        do {\n          node.mixins.push(this.flowParseInterfaceExtends());\n        } while (this.eat(tt.comma));\n      }\n\n      if (this.isContextual(\"implements\")) {\n        this.next();\n        do {\n          node.implements.push(this.flowParseInterfaceExtends());\n        } while (this.eat(tt.comma));\n      }\n\n      node.body = this.flowParseObjectType({\n        allowStatic: isClass,\n        allowExact: false,\n        allowSpread: false,\n        allowProto: isClass,\n        allowInexact: false,\n      });\n    }\n\n    flowParseInterfaceExtends(): N.FlowInterfaceExtends {\n      const node = this.startNode();\n\n      node.id = this.flowParseQualifiedTypeIdentifier();\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterInstantiation();\n      } else {\n        node.typeParameters = null;\n      }\n\n      return this.finishNode(node, \"InterfaceExtends\");\n    }\n\n    flowParseInterface(node: N.FlowInterface): N.FlowInterface {\n      this.flowParseInterfaceish(node);\n      return this.finishNode(node, \"InterfaceDeclaration\");\n    }\n\n    checkNotUnderscore(word: string) {\n      if (word === \"_\") {\n        this.raise(this.state.start, FlowErrors.UnexpectedReservedUnderscore);\n      }\n    }\n\n    checkReservedType(word: string, startLoc: number, declaration?: boolean) {\n      if (!reservedTypes.has(word)) return;\n\n      this.raise(\n        startLoc,\n        declaration\n          ? FlowErrors.AssignReservedType\n          : FlowErrors.UnexpectedReservedType,\n        word,\n      );\n    }\n\n    flowParseRestrictedIdentifier(\n      liberal?: boolean,\n      declaration?: boolean,\n    ): N.Identifier {\n      this.checkReservedType(this.state.value, this.state.start, declaration);\n      return this.parseIdentifier(liberal);\n    }\n\n    // Type aliases\n\n    flowParseTypeAlias(node: N.FlowTypeAlias): N.FlowTypeAlias {\n      node.id = this.flowParseRestrictedIdentifier(\n        /* liberal */ false,\n        /* declaration */ true,\n      );\n      this.scope.declareName(node.id.name, BIND_LEXICAL, node.id.start);\n\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      } else {\n        node.typeParameters = null;\n      }\n\n      node.right = this.flowParseTypeInitialiser(tt.eq);\n      this.semicolon();\n\n      return this.finishNode(node, \"TypeAlias\");\n    }\n\n    flowParseOpaqueType(\n      node: N.FlowOpaqueType,\n      declare: boolean,\n    ): N.FlowOpaqueType {\n      this.expectContextual(\"type\");\n      node.id = this.flowParseRestrictedIdentifier(\n        /* liberal */ true,\n        /* declaration */ true,\n      );\n      this.scope.declareName(node.id.name, BIND_LEXICAL, node.id.start);\n\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      } else {\n        node.typeParameters = null;\n      }\n\n      // Parse the supertype\n      node.supertype = null;\n      if (this.match(tt.colon)) {\n        node.supertype = this.flowParseTypeInitialiser(tt.colon);\n      }\n\n      node.impltype = null;\n      if (!declare) {\n        node.impltype = this.flowParseTypeInitialiser(tt.eq);\n      }\n      this.semicolon();\n\n      return this.finishNode(node, \"OpaqueType\");\n    }\n\n    // Type annotations\n\n    flowParseTypeParameter(requireDefault?: boolean = false): N.TypeParameter {\n      const nodeStart = this.state.start;\n\n      const node = this.startNode();\n\n      const variance = this.flowParseVariance();\n\n      const ident = this.flowParseTypeAnnotatableIdentifier();\n      node.name = ident.name;\n      node.variance = variance;\n      node.bound = ident.typeAnnotation;\n\n      if (this.match(tt.eq)) {\n        this.eat(tt.eq);\n        node.default = this.flowParseType();\n      } else {\n        if (requireDefault) {\n          this.raise(nodeStart, FlowErrors.MissingTypeParamDefault);\n        }\n      }\n\n      return this.finishNode(node, \"TypeParameter\");\n    }\n\n    flowParseTypeParameterDeclaration(): N.TypeParameterDeclaration {\n      const oldInType = this.state.inType;\n      const node = this.startNode();\n      node.params = [];\n\n      this.state.inType = true;\n\n      // istanbul ignore else: this condition is already checked at all call sites\n      if (this.isRelational(\"<\") || this.match(tt.jsxTagStart)) {\n        this.next();\n      } else {\n        this.unexpected();\n      }\n\n      let defaultRequired = false;\n\n      do {\n        const typeParameter = this.flowParseTypeParameter(defaultRequired);\n\n        node.params.push(typeParameter);\n\n        if (typeParameter.default) {\n          defaultRequired = true;\n        }\n\n        if (!this.isRelational(\">\")) {\n          this.expect(tt.comma);\n        }\n      } while (!this.isRelational(\">\"));\n      this.expectRelational(\">\");\n\n      this.state.inType = oldInType;\n\n      return this.finishNode(node, \"TypeParameterDeclaration\");\n    }\n\n    flowParseTypeParameterInstantiation(): N.TypeParameterInstantiation {\n      const node = this.startNode();\n      const oldInType = this.state.inType;\n      node.params = [];\n\n      this.state.inType = true;\n\n      this.expectRelational(\"<\");\n      const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n      this.state.noAnonFunctionType = false;\n      while (!this.isRelational(\">\")) {\n        node.params.push(this.flowParseType());\n        if (!this.isRelational(\">\")) {\n          this.expect(tt.comma);\n        }\n      }\n      this.state.noAnonFunctionType = oldNoAnonFunctionType;\n      this.expectRelational(\">\");\n\n      this.state.inType = oldInType;\n\n      return this.finishNode(node, \"TypeParameterInstantiation\");\n    }\n\n    flowParseTypeParameterInstantiationCallOrNew(): N.TypeParameterInstantiation {\n      const node = this.startNode();\n      const oldInType = this.state.inType;\n      node.params = [];\n\n      this.state.inType = true;\n\n      this.expectRelational(\"<\");\n      while (!this.isRelational(\">\")) {\n        node.params.push(this.flowParseTypeOrImplicitInstantiation());\n        if (!this.isRelational(\">\")) {\n          this.expect(tt.comma);\n        }\n      }\n      this.expectRelational(\">\");\n\n      this.state.inType = oldInType;\n\n      return this.finishNode(node, \"TypeParameterInstantiation\");\n    }\n\n    flowParseInterfaceType(): N.FlowInterfaceType {\n      const node = this.startNode();\n      this.expectContextual(\"interface\");\n\n      node.extends = [];\n      if (this.eat(tt._extends)) {\n        do {\n          node.extends.push(this.flowParseInterfaceExtends());\n        } while (this.eat(tt.comma));\n      }\n\n      node.body = this.flowParseObjectType({\n        allowStatic: false,\n        allowExact: false,\n        allowSpread: false,\n        allowProto: false,\n        allowInexact: false,\n      });\n\n      return this.finishNode(node, \"InterfaceTypeAnnotation\");\n    }\n\n    flowParseObjectPropertyKey(): N.Expression {\n      return this.match(tt.num) || this.match(tt.string)\n        ? this.parseExprAtom()\n        : this.parseIdentifier(true);\n    }\n\n    flowParseObjectTypeIndexer(\n      node: N.FlowObjectTypeIndexer,\n      isStatic: boolean,\n      variance: ?N.FlowVariance,\n    ): N.FlowObjectTypeIndexer {\n      node.static = isStatic;\n\n      // Note: bracketL has already been consumed\n      if (this.lookahead().type === tt.colon) {\n        node.id = this.flowParseObjectPropertyKey();\n        node.key = this.flowParseTypeInitialiser();\n      } else {\n        node.id = null;\n        node.key = this.flowParseType();\n      }\n      this.expect(tt.bracketR);\n      node.value = this.flowParseTypeInitialiser();\n      node.variance = variance;\n\n      return this.finishNode(node, \"ObjectTypeIndexer\");\n    }\n\n    flowParseObjectTypeInternalSlot(\n      node: N.FlowObjectTypeInternalSlot,\n      isStatic: boolean,\n    ): N.FlowObjectTypeInternalSlot {\n      node.static = isStatic;\n      // Note: both bracketL have already been consumed\n      node.id = this.flowParseObjectPropertyKey();\n      this.expect(tt.bracketR);\n      this.expect(tt.bracketR);\n      if (this.isRelational(\"<\") || this.match(tt.parenL)) {\n        node.method = true;\n        node.optional = false;\n        node.value = this.flowParseObjectTypeMethodish(\n          this.startNodeAt(node.start, node.loc.start),\n        );\n      } else {\n        node.method = false;\n        if (this.eat(tt.question)) {\n          node.optional = true;\n        }\n        node.value = this.flowParseTypeInitialiser();\n      }\n      return this.finishNode(node, \"ObjectTypeInternalSlot\");\n    }\n\n    flowParseObjectTypeMethodish(\n      node: N.FlowFunctionTypeAnnotation,\n    ): N.FlowFunctionTypeAnnotation {\n      node.params = [];\n      node.rest = null;\n      node.typeParameters = null;\n\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      }\n\n      this.expect(tt.parenL);\n      while (!this.match(tt.parenR) && !this.match(tt.ellipsis)) {\n        node.params.push(this.flowParseFunctionTypeParam());\n        if (!this.match(tt.parenR)) {\n          this.expect(tt.comma);\n        }\n      }\n\n      if (this.eat(tt.ellipsis)) {\n        node.rest = this.flowParseFunctionTypeParam();\n      }\n      this.expect(tt.parenR);\n      node.returnType = this.flowParseTypeInitialiser();\n\n      return this.finishNode(node, \"FunctionTypeAnnotation\");\n    }\n\n    flowParseObjectTypeCallProperty(\n      node: N.FlowObjectTypeCallProperty,\n      isStatic: boolean,\n    ): N.FlowObjectTypeCallProperty {\n      const valueNode = this.startNode();\n      node.static = isStatic;\n      node.value = this.flowParseObjectTypeMethodish(valueNode);\n      return this.finishNode(node, \"ObjectTypeCallProperty\");\n    }\n\n    flowParseObjectType({\n      allowStatic,\n      allowExact,\n      allowSpread,\n      allowProto,\n      allowInexact,\n    }: {\n      allowStatic: boolean,\n      allowExact: boolean,\n      allowSpread: boolean,\n      allowProto: boolean,\n      allowInexact: boolean,\n    }): N.FlowObjectTypeAnnotation {\n      const oldInType = this.state.inType;\n      this.state.inType = true;\n\n      const nodeStart = this.startNode();\n\n      nodeStart.callProperties = [];\n      nodeStart.properties = [];\n      nodeStart.indexers = [];\n      nodeStart.internalSlots = [];\n\n      let endDelim;\n      let exact;\n      let inexact = false;\n      if (allowExact && this.match(tt.braceBarL)) {\n        this.expect(tt.braceBarL);\n        endDelim = tt.braceBarR;\n        exact = true;\n      } else {\n        this.expect(tt.braceL);\n        endDelim = tt.braceR;\n        exact = false;\n      }\n\n      nodeStart.exact = exact;\n\n      while (!this.match(endDelim)) {\n        let isStatic = false;\n        let protoStart: ?number = null;\n        let inexactStart: ?number = null;\n        const node = this.startNode();\n\n        if (allowProto && this.isContextual(\"proto\")) {\n          const lookahead = this.lookahead();\n\n          if (lookahead.type !== tt.colon && lookahead.type !== tt.question) {\n            this.next();\n            protoStart = this.state.start;\n            allowStatic = false;\n          }\n        }\n\n        if (allowStatic && this.isContextual(\"static\")) {\n          const lookahead = this.lookahead();\n\n          // static is a valid identifier name\n          if (lookahead.type !== tt.colon && lookahead.type !== tt.question) {\n            this.next();\n            isStatic = true;\n          }\n        }\n\n        const variance = this.flowParseVariance();\n\n        if (this.eat(tt.bracketL)) {\n          if (protoStart != null) {\n            this.unexpected(protoStart);\n          }\n          if (this.eat(tt.bracketL)) {\n            if (variance) {\n              this.unexpected(variance.start);\n            }\n            nodeStart.internalSlots.push(\n              this.flowParseObjectTypeInternalSlot(node, isStatic),\n            );\n          } else {\n            nodeStart.indexers.push(\n              this.flowParseObjectTypeIndexer(node, isStatic, variance),\n            );\n          }\n        } else if (this.match(tt.parenL) || this.isRelational(\"<\")) {\n          if (protoStart != null) {\n            this.unexpected(protoStart);\n          }\n          if (variance) {\n            this.unexpected(variance.start);\n          }\n          nodeStart.callProperties.push(\n            this.flowParseObjectTypeCallProperty(node, isStatic),\n          );\n        } else {\n          let kind = \"init\";\n\n          if (this.isContextual(\"get\") || this.isContextual(\"set\")) {\n            const lookahead = this.lookahead();\n            if (\n              lookahead.type === tt.name ||\n              lookahead.type === tt.string ||\n              lookahead.type === tt.num\n            ) {\n              kind = this.state.value;\n              this.next();\n            }\n          }\n\n          const propOrInexact = this.flowParseObjectTypeProperty(\n            node,\n            isStatic,\n            protoStart,\n            variance,\n            kind,\n            allowSpread,\n            allowInexact ?? !exact,\n          );\n\n          if (propOrInexact === null) {\n            inexact = true;\n            inexactStart = this.state.lastTokStart;\n          } else {\n            nodeStart.properties.push(propOrInexact);\n          }\n        }\n\n        this.flowObjectTypeSemicolon();\n\n        if (\n          inexactStart &&\n          !this.match(tt.braceR) &&\n          !this.match(tt.braceBarR)\n        ) {\n          this.raise(\n            inexactStart,\n            FlowErrors.UnexpectedExplicitInexactInObject,\n          );\n        }\n      }\n\n      this.expect(endDelim);\n\n      /* The inexact flag should only be added on ObjectTypeAnnotations that\n       * are not the body of an interface, declare interface, or declare class.\n       * Since spreads are only allowed in objec types, checking that is\n       * sufficient here.\n       */\n      if (allowSpread) {\n        nodeStart.inexact = inexact;\n      }\n\n      const out = this.finishNode(nodeStart, \"ObjectTypeAnnotation\");\n\n      this.state.inType = oldInType;\n\n      return out;\n    }\n\n    flowParseObjectTypeProperty(\n      node: N.FlowObjectTypeProperty | N.FlowObjectTypeSpreadProperty,\n      isStatic: boolean,\n      protoStart: ?number,\n      variance: ?N.FlowVariance,\n      kind: string,\n      allowSpread: boolean,\n      allowInexact: boolean,\n    ): (N.FlowObjectTypeProperty | N.FlowObjectTypeSpreadProperty) | null {\n      if (this.eat(tt.ellipsis)) {\n        const isInexactToken =\n          this.match(tt.comma) ||\n          this.match(tt.semi) ||\n          this.match(tt.braceR) ||\n          this.match(tt.braceBarR);\n\n        if (isInexactToken) {\n          if (!allowSpread) {\n            this.raise(\n              this.state.lastTokStart,\n              FlowErrors.InexactInsideNonObject,\n            );\n          } else if (!allowInexact) {\n            this.raise(this.state.lastTokStart, FlowErrors.InexactInsideExact);\n          }\n          if (variance) {\n            this.raise(variance.start, FlowErrors.InexactVariance);\n          }\n\n          return null;\n        }\n\n        if (!allowSpread) {\n          this.raise(this.state.lastTokStart, FlowErrors.UnexpectedSpreadType);\n        }\n        if (protoStart != null) {\n          this.unexpected(protoStart);\n        }\n        if (variance) {\n          this.raise(variance.start, FlowErrors.SpreadVariance);\n        }\n\n        node.argument = this.flowParseType();\n        return this.finishNode(node, \"ObjectTypeSpreadProperty\");\n      } else {\n        node.key = this.flowParseObjectPropertyKey();\n        node.static = isStatic;\n        node.proto = protoStart != null;\n        node.kind = kind;\n\n        let optional = false;\n        if (this.isRelational(\"<\") || this.match(tt.parenL)) {\n          // This is a method property\n          node.method = true;\n\n          if (protoStart != null) {\n            this.unexpected(protoStart);\n          }\n          if (variance) {\n            this.unexpected(variance.start);\n          }\n\n          node.value = this.flowParseObjectTypeMethodish(\n            this.startNodeAt(node.start, node.loc.start),\n          );\n          if (kind === \"get\" || kind === \"set\") {\n            this.flowCheckGetterSetterParams(node);\n          }\n        } else {\n          if (kind !== \"init\") this.unexpected();\n\n          node.method = false;\n\n          if (this.eat(tt.question)) {\n            optional = true;\n          }\n          node.value = this.flowParseTypeInitialiser();\n          node.variance = variance;\n        }\n\n        node.optional = optional;\n\n        return this.finishNode(node, \"ObjectTypeProperty\");\n      }\n    }\n\n    // This is similar to checkGetterSetterParams, but as\n    // @babel/parser uses non estree properties we cannot reuse it here\n    flowCheckGetterSetterParams(\n      property: N.FlowObjectTypeProperty | N.FlowObjectTypeSpreadProperty,\n    ): void {\n      const paramCount = property.kind === \"get\" ? 0 : 1;\n      const start = property.start;\n      const length =\n        property.value.params.length + (property.value.rest ? 1 : 0);\n      if (length !== paramCount) {\n        if (property.kind === \"get\") {\n          this.raise(start, Errors.BadGetterArity);\n        } else {\n          this.raise(start, Errors.BadSetterArity);\n        }\n      }\n\n      if (property.kind === \"set\" && property.value.rest) {\n        this.raise(start, Errors.BadSetterRestParameter);\n      }\n    }\n\n    flowObjectTypeSemicolon(): void {\n      if (\n        !this.eat(tt.semi) &&\n        !this.eat(tt.comma) &&\n        !this.match(tt.braceR) &&\n        !this.match(tt.braceBarR)\n      ) {\n        this.unexpected();\n      }\n    }\n\n    flowParseQualifiedTypeIdentifier(\n      startPos?: number,\n      startLoc?: Position,\n      id?: N.Identifier,\n    ): N.FlowQualifiedTypeIdentifier {\n      startPos = startPos || this.state.start;\n      startLoc = startLoc || this.state.startLoc;\n      let node = id || this.flowParseRestrictedIdentifier(true);\n\n      while (this.eat(tt.dot)) {\n        const node2 = this.startNodeAt(startPos, startLoc);\n        node2.qualification = node;\n        node2.id = this.flowParseRestrictedIdentifier(true);\n        node = this.finishNode(node2, \"QualifiedTypeIdentifier\");\n      }\n\n      return node;\n    }\n\n    flowParseGenericType(\n      startPos: number,\n      startLoc: Position,\n      id: N.Identifier,\n    ): N.FlowGenericTypeAnnotation {\n      const node = this.startNodeAt(startPos, startLoc);\n\n      node.typeParameters = null;\n      node.id = this.flowParseQualifiedTypeIdentifier(startPos, startLoc, id);\n\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterInstantiation();\n      }\n\n      return this.finishNode(node, \"GenericTypeAnnotation\");\n    }\n\n    flowParseTypeofType(): N.FlowTypeofTypeAnnotation {\n      const node = this.startNode();\n      this.expect(tt._typeof);\n      node.argument = this.flowParsePrimaryType();\n      return this.finishNode(node, \"TypeofTypeAnnotation\");\n    }\n\n    flowParseTupleType(): N.FlowTupleTypeAnnotation {\n      const node = this.startNode();\n      node.types = [];\n      this.expect(tt.bracketL);\n      // We allow trailing commas\n      while (this.state.pos < this.length && !this.match(tt.bracketR)) {\n        node.types.push(this.flowParseType());\n        if (this.match(tt.bracketR)) break;\n        this.expect(tt.comma);\n      }\n      this.expect(tt.bracketR);\n      return this.finishNode(node, \"TupleTypeAnnotation\");\n    }\n\n    flowParseFunctionTypeParam(): N.FlowFunctionTypeParam {\n      let name = null;\n      let optional = false;\n      let typeAnnotation = null;\n      const node = this.startNode();\n      const lh = this.lookahead();\n      if (lh.type === tt.colon || lh.type === tt.question) {\n        name = this.parseIdentifier();\n        if (this.eat(tt.question)) {\n          optional = true;\n        }\n        typeAnnotation = this.flowParseTypeInitialiser();\n      } else {\n        typeAnnotation = this.flowParseType();\n      }\n      node.name = name;\n      node.optional = optional;\n      node.typeAnnotation = typeAnnotation;\n      return this.finishNode(node, \"FunctionTypeParam\");\n    }\n\n    reinterpretTypeAsFunctionTypeParam(\n      type: N.FlowType,\n    ): N.FlowFunctionTypeParam {\n      const node = this.startNodeAt(type.start, type.loc.start);\n      node.name = null;\n      node.optional = false;\n      node.typeAnnotation = type;\n      return this.finishNode(node, \"FunctionTypeParam\");\n    }\n\n    flowParseFunctionTypeParams(\n      params: N.FlowFunctionTypeParam[] = [],\n    ): { params: N.FlowFunctionTypeParam[], rest: ?N.FlowFunctionTypeParam } {\n      let rest: ?N.FlowFunctionTypeParam = null;\n      while (!this.match(tt.parenR) && !this.match(tt.ellipsis)) {\n        params.push(this.flowParseFunctionTypeParam());\n        if (!this.match(tt.parenR)) {\n          this.expect(tt.comma);\n        }\n      }\n      if (this.eat(tt.ellipsis)) {\n        rest = this.flowParseFunctionTypeParam();\n      }\n      return { params, rest };\n    }\n\n    flowIdentToTypeAnnotation(\n      startPos: number,\n      startLoc: Position,\n      node: N.FlowTypeAnnotation,\n      id: N.Identifier,\n    ): N.FlowTypeAnnotation {\n      switch (id.name) {\n        case \"any\":\n          return this.finishNode(node, \"AnyTypeAnnotation\");\n\n        case \"bool\":\n        case \"boolean\":\n          return this.finishNode(node, \"BooleanTypeAnnotation\");\n\n        case \"mixed\":\n          return this.finishNode(node, \"MixedTypeAnnotation\");\n\n        case \"empty\":\n          return this.finishNode(node, \"EmptyTypeAnnotation\");\n\n        case \"number\":\n          return this.finishNode(node, \"NumberTypeAnnotation\");\n\n        case \"string\":\n          return this.finishNode(node, \"StringTypeAnnotation\");\n\n        case \"symbol\":\n          return this.finishNode(node, \"SymbolTypeAnnotation\");\n\n        default:\n          this.checkNotUnderscore(id.name);\n          return this.flowParseGenericType(startPos, startLoc, id);\n      }\n    }\n\n    // The parsing of types roughly parallels the parsing of expressions, and\n    // primary types are kind of like primary expressions...they're the\n    // primitives with which other types are constructed.\n    flowParsePrimaryType(): N.FlowTypeAnnotation {\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n      const node = this.startNode();\n      let tmp;\n      let type;\n      let isGroupedType = false;\n      const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n\n      switch (this.state.type) {\n        case tt.name:\n          if (this.isContextual(\"interface\")) {\n            return this.flowParseInterfaceType();\n          }\n\n          return this.flowIdentToTypeAnnotation(\n            startPos,\n            startLoc,\n            node,\n            this.parseIdentifier(),\n          );\n\n        case tt.braceL:\n          return this.flowParseObjectType({\n            allowStatic: false,\n            allowExact: false,\n            allowSpread: true,\n            allowProto: false,\n            allowInexact: true,\n          });\n\n        case tt.braceBarL:\n          return this.flowParseObjectType({\n            allowStatic: false,\n            allowExact: true,\n            allowSpread: true,\n            allowProto: false,\n            allowInexact: false,\n          });\n\n        case tt.bracketL:\n          this.state.noAnonFunctionType = false;\n          type = this.flowParseTupleType();\n          this.state.noAnonFunctionType = oldNoAnonFunctionType;\n          return type;\n\n        case tt.relational:\n          if (this.state.value === \"<\") {\n            node.typeParameters = this.flowParseTypeParameterDeclaration();\n            this.expect(tt.parenL);\n            tmp = this.flowParseFunctionTypeParams();\n            node.params = tmp.params;\n            node.rest = tmp.rest;\n            this.expect(tt.parenR);\n\n            this.expect(tt.arrow);\n\n            node.returnType = this.flowParseType();\n\n            return this.finishNode(node, \"FunctionTypeAnnotation\");\n          }\n          break;\n\n        case tt.parenL:\n          this.next();\n\n          // Check to see if this is actually a grouped type\n          if (!this.match(tt.parenR) && !this.match(tt.ellipsis)) {\n            if (this.match(tt.name)) {\n              const token = this.lookahead().type;\n              isGroupedType = token !== tt.question && token !== tt.colon;\n            } else {\n              isGroupedType = true;\n            }\n          }\n\n          if (isGroupedType) {\n            this.state.noAnonFunctionType = false;\n            type = this.flowParseType();\n            this.state.noAnonFunctionType = oldNoAnonFunctionType;\n\n            // A `,` or a `) =>` means this is an anonymous function type\n            if (\n              this.state.noAnonFunctionType ||\n              !(\n                this.match(tt.comma) ||\n                (this.match(tt.parenR) && this.lookahead().type === tt.arrow)\n              )\n            ) {\n              this.expect(tt.parenR);\n              return type;\n            } else {\n              // Eat a comma if there is one\n              this.eat(tt.comma);\n            }\n          }\n\n          if (type) {\n            tmp = this.flowParseFunctionTypeParams([\n              this.reinterpretTypeAsFunctionTypeParam(type),\n            ]);\n          } else {\n            tmp = this.flowParseFunctionTypeParams();\n          }\n\n          node.params = tmp.params;\n          node.rest = tmp.rest;\n\n          this.expect(tt.parenR);\n\n          this.expect(tt.arrow);\n\n          node.returnType = this.flowParseType();\n\n          node.typeParameters = null;\n\n          return this.finishNode(node, \"FunctionTypeAnnotation\");\n\n        case tt.string:\n          return this.parseLiteral(\n            this.state.value,\n            \"StringLiteralTypeAnnotation\",\n          );\n\n        case tt._true:\n        case tt._false:\n          node.value = this.match(tt._true);\n          this.next();\n          return this.finishNode(node, \"BooleanLiteralTypeAnnotation\");\n\n        case tt.plusMin:\n          if (this.state.value === \"-\") {\n            this.next();\n            if (this.match(tt.num)) {\n              return this.parseLiteral(\n                -this.state.value,\n                \"NumberLiteralTypeAnnotation\",\n                node.start,\n                node.loc.start,\n              );\n            }\n\n            if (this.match(tt.bigint)) {\n              return this.parseLiteral(\n                -this.state.value,\n                \"BigIntLiteralTypeAnnotation\",\n                node.start,\n                node.loc.start,\n              );\n            }\n\n            throw this.raise(\n              this.state.start,\n              FlowErrors.UnexpectedSubtractionOperand,\n            );\n          }\n\n          throw this.unexpected();\n        case tt.num:\n          return this.parseLiteral(\n            this.state.value,\n            \"NumberLiteralTypeAnnotation\",\n          );\n\n        case tt.bigint:\n          return this.parseLiteral(\n            this.state.value,\n            \"BigIntLiteralTypeAnnotation\",\n          );\n\n        case tt._void:\n          this.next();\n          return this.finishNode(node, \"VoidTypeAnnotation\");\n\n        case tt._null:\n          this.next();\n          return this.finishNode(node, \"NullLiteralTypeAnnotation\");\n\n        case tt._this:\n          this.next();\n          return this.finishNode(node, \"ThisTypeAnnotation\");\n\n        case tt.star:\n          this.next();\n          return this.finishNode(node, \"ExistsTypeAnnotation\");\n\n        default:\n          if (this.state.type.keyword === \"typeof\") {\n            return this.flowParseTypeofType();\n          } else if (this.state.type.keyword) {\n            const label = this.state.type.label;\n            this.next();\n            return super.createIdentifier(node, label);\n          }\n      }\n\n      throw this.unexpected();\n    }\n\n    flowParsePostfixType(): N.FlowTypeAnnotation {\n      const startPos = this.state.start,\n        startLoc = this.state.startLoc;\n      let type = this.flowParsePrimaryType();\n      while (this.match(tt.bracketL) && !this.canInsertSemicolon()) {\n        const node = this.startNodeAt(startPos, startLoc);\n        node.elementType = type;\n        this.expect(tt.bracketL);\n        this.expect(tt.bracketR);\n        type = this.finishNode(node, \"ArrayTypeAnnotation\");\n      }\n      return type;\n    }\n\n    flowParsePrefixType(): N.FlowTypeAnnotation {\n      const node = this.startNode();\n      if (this.eat(tt.question)) {\n        node.typeAnnotation = this.flowParsePrefixType();\n        return this.finishNode(node, \"NullableTypeAnnotation\");\n      } else {\n        return this.flowParsePostfixType();\n      }\n    }\n\n    flowParseAnonFunctionWithoutParens(): N.FlowTypeAnnotation {\n      const param = this.flowParsePrefixType();\n      if (!this.state.noAnonFunctionType && this.eat(tt.arrow)) {\n        // TODO: This should be a type error. Passing in a SourceLocation, and it expects a Position.\n        const node = this.startNodeAt(param.start, param.loc.start);\n        node.params = [this.reinterpretTypeAsFunctionTypeParam(param)];\n        node.rest = null;\n        node.returnType = this.flowParseType();\n        node.typeParameters = null;\n        return this.finishNode(node, \"FunctionTypeAnnotation\");\n      }\n      return param;\n    }\n\n    flowParseIntersectionType(): N.FlowTypeAnnotation {\n      const node = this.startNode();\n      this.eat(tt.bitwiseAND);\n      const type = this.flowParseAnonFunctionWithoutParens();\n      node.types = [type];\n      while (this.eat(tt.bitwiseAND)) {\n        node.types.push(this.flowParseAnonFunctionWithoutParens());\n      }\n      return node.types.length === 1\n        ? type\n        : this.finishNode(node, \"IntersectionTypeAnnotation\");\n    }\n\n    flowParseUnionType(): N.FlowTypeAnnotation {\n      const node = this.startNode();\n      this.eat(tt.bitwiseOR);\n      const type = this.flowParseIntersectionType();\n      node.types = [type];\n      while (this.eat(tt.bitwiseOR)) {\n        node.types.push(this.flowParseIntersectionType());\n      }\n      return node.types.length === 1\n        ? type\n        : this.finishNode(node, \"UnionTypeAnnotation\");\n    }\n\n    flowParseType(): N.FlowTypeAnnotation {\n      const oldInType = this.state.inType;\n      this.state.inType = true;\n      const type = this.flowParseUnionType();\n      this.state.inType = oldInType;\n      // Ensure that a brace after a function generic type annotation is a\n      // statement, except in arrow functions (noAnonFunctionType)\n      this.state.exprAllowed =\n        this.state.exprAllowed || this.state.noAnonFunctionType;\n      return type;\n    }\n\n    flowParseTypeOrImplicitInstantiation(): N.FlowTypeAnnotation {\n      if (this.state.type === tt.name && this.state.value === \"_\") {\n        const startPos = this.state.start;\n        const startLoc = this.state.startLoc;\n        const node = this.parseIdentifier();\n        return this.flowParseGenericType(startPos, startLoc, node);\n      } else {\n        return this.flowParseType();\n      }\n    }\n\n    flowParseTypeAnnotation(): N.FlowTypeAnnotation {\n      const node = this.startNode();\n      node.typeAnnotation = this.flowParseTypeInitialiser();\n      return this.finishNode(node, \"TypeAnnotation\");\n    }\n\n    flowParseTypeAnnotatableIdentifier(\n      allowPrimitiveOverride?: boolean,\n    ): N.Identifier {\n      const ident = allowPrimitiveOverride\n        ? this.parseIdentifier()\n        : this.flowParseRestrictedIdentifier();\n      if (this.match(tt.colon)) {\n        ident.typeAnnotation = this.flowParseTypeAnnotation();\n        this.resetEndLocation(ident);\n      }\n      return ident;\n    }\n\n    typeCastToParameter(node: N.Node): N.Node {\n      node.expression.typeAnnotation = node.typeAnnotation;\n\n      this.resetEndLocation(\n        node.expression,\n        node.typeAnnotation.end,\n        node.typeAnnotation.loc.end,\n      );\n\n      return node.expression;\n    }\n\n    flowParseVariance(): ?N.FlowVariance {\n      let variance = null;\n      if (this.match(tt.plusMin)) {\n        variance = this.startNode();\n        if (this.state.value === \"+\") {\n          variance.kind = \"plus\";\n        } else {\n          variance.kind = \"minus\";\n        }\n        this.next();\n        this.finishNode(variance, \"Variance\");\n      }\n      return variance;\n    }\n\n    // ==================================\n    // Overrides\n    // ==================================\n\n    parseFunctionBody(\n      node: N.Function,\n      allowExpressionBody: ?boolean,\n      isMethod?: boolean = false,\n    ): void {\n      if (allowExpressionBody) {\n        return this.forwardNoArrowParamsConversionAt(node, () =>\n          super.parseFunctionBody(node, true, isMethod),\n        );\n      }\n\n      return super.parseFunctionBody(node, false, isMethod);\n    }\n\n    parseFunctionBodyAndFinish(\n      node: N.BodilessFunctionOrMethodBase,\n      type: string,\n      isMethod?: boolean = false,\n    ): void {\n      if (this.match(tt.colon)) {\n        const typeNode = this.startNode();\n\n        [\n          // $FlowFixMe (destructuring not supported yet)\n          typeNode.typeAnnotation,\n          // $FlowFixMe (destructuring not supported yet)\n          node.predicate,\n        ] = this.flowParseTypeAndPredicateInitialiser();\n\n        node.returnType = typeNode.typeAnnotation\n          ? this.finishNode(typeNode, \"TypeAnnotation\")\n          : null;\n      }\n\n      super.parseFunctionBodyAndFinish(node, type, isMethod);\n    }\n\n    // interfaces and enums\n    parseStatement(context: ?string, topLevel?: boolean): N.Statement {\n      // strict mode handling of `interface` since it's a reserved word\n      if (\n        this.state.strict &&\n        this.match(tt.name) &&\n        this.state.value === \"interface\"\n      ) {\n        const node = this.startNode();\n        this.next();\n        return this.flowParseInterface(node);\n      } else if (this.shouldParseEnums() && this.isContextual(\"enum\")) {\n        const node = this.startNode();\n        this.next();\n        return this.flowParseEnumDeclaration(node);\n      } else {\n        const stmt = super.parseStatement(context, topLevel);\n        // We will parse a flow pragma in any comment before the first statement.\n        if (this.flowPragma === undefined && !this.isValidDirective(stmt)) {\n          this.flowPragma = null;\n        }\n        return stmt;\n      }\n    }\n\n    // declares, interfaces and type aliases\n    parseExpressionStatement(\n      node: N.ExpressionStatement,\n      expr: N.Expression,\n    ): N.ExpressionStatement {\n      if (expr.type === \"Identifier\") {\n        if (expr.name === \"declare\") {\n          if (\n            this.match(tt._class) ||\n            this.match(tt.name) ||\n            this.match(tt._function) ||\n            this.match(tt._var) ||\n            this.match(tt._export)\n          ) {\n            return this.flowParseDeclare(node);\n          }\n        } else if (this.match(tt.name)) {\n          if (expr.name === \"interface\") {\n            return this.flowParseInterface(node);\n          } else if (expr.name === \"type\") {\n            return this.flowParseTypeAlias(node);\n          } else if (expr.name === \"opaque\") {\n            return this.flowParseOpaqueType(node, false);\n          }\n        }\n      }\n\n      return super.parseExpressionStatement(node, expr);\n    }\n\n    // export type\n    shouldParseExportDeclaration(): boolean {\n      return (\n        this.isContextual(\"type\") ||\n        this.isContextual(\"interface\") ||\n        this.isContextual(\"opaque\") ||\n        (this.shouldParseEnums() && this.isContextual(\"enum\")) ||\n        super.shouldParseExportDeclaration()\n      );\n    }\n\n    isExportDefaultSpecifier(): boolean {\n      if (\n        this.match(tt.name) &&\n        (this.state.value === \"type\" ||\n          this.state.value === \"interface\" ||\n          this.state.value === \"opaque\" ||\n          (this.shouldParseEnums() && this.state.value === \"enum\"))\n      ) {\n        return false;\n      }\n\n      return super.isExportDefaultSpecifier();\n    }\n\n    parseExportDefaultExpression(): N.Expression | N.Declaration {\n      if (this.shouldParseEnums() && this.isContextual(\"enum\")) {\n        const node = this.startNode();\n        this.next();\n        return this.flowParseEnumDeclaration(node);\n      }\n      return super.parseExportDefaultExpression();\n    }\n\n    parseConditional(\n      expr: N.Expression,\n      noIn: ?boolean,\n      startPos: number,\n      startLoc: Position,\n      refNeedsArrowPos?: ?Pos,\n    ): N.Expression {\n      if (!this.match(tt.question)) return expr;\n\n      // only use the expensive \"tryParse\" method if there is a question mark\n      // and if we come from inside parens\n      if (refNeedsArrowPos) {\n        const result = this.tryParse(() =>\n          super.parseConditional(expr, noIn, startPos, startLoc),\n        );\n\n        if (!result.node) {\n          // $FlowIgnore\n          refNeedsArrowPos.start = result.error.pos || this.state.start;\n          return expr;\n        }\n\n        if (result.error) this.state = result.failState;\n        return result.node;\n      }\n\n      this.expect(tt.question);\n      const state = this.state.clone();\n      const originalNoArrowAt = this.state.noArrowAt;\n      const node = this.startNodeAt(startPos, startLoc);\n      let { consequent, failed } = this.tryParseConditionalConsequent();\n      let [valid, invalid] = this.getArrowLikeExpressions(consequent);\n\n      if (failed || invalid.length > 0) {\n        const noArrowAt = [...originalNoArrowAt];\n\n        if (invalid.length > 0) {\n          this.state = state;\n          this.state.noArrowAt = noArrowAt;\n\n          for (let i = 0; i < invalid.length; i++) {\n            noArrowAt.push(invalid[i].start);\n          }\n\n          ({ consequent, failed } = this.tryParseConditionalConsequent());\n          [valid, invalid] = this.getArrowLikeExpressions(consequent);\n        }\n\n        if (failed && valid.length > 1) {\n          // if there are two or more possible correct ways of parsing, throw an\n          // error.\n          // e.g.   Source: a ? (b): c => (d): e => f\n          //      Result 1: a ? b : (c => ((d): e => f))\n          //      Result 2: a ? ((b): c => d) : (e => f)\n          this.raise(state.start, FlowErrors.AmbiguousConditionalArrow);\n        }\n\n        if (failed && valid.length === 1) {\n          this.state = state;\n          this.state.noArrowAt = noArrowAt.concat(valid[0].start);\n          ({ consequent, failed } = this.tryParseConditionalConsequent());\n        }\n      }\n\n      this.getArrowLikeExpressions(consequent, true);\n\n      this.state.noArrowAt = originalNoArrowAt;\n      this.expect(tt.colon);\n\n      node.test = expr;\n      node.consequent = consequent;\n      node.alternate = this.forwardNoArrowParamsConversionAt(node, () =>\n        this.parseMaybeAssign(noIn, undefined, undefined, undefined),\n      );\n\n      return this.finishNode(node, \"ConditionalExpression\");\n    }\n\n    tryParseConditionalConsequent(): {\n      consequent: N.Expression,\n      failed: boolean,\n    } {\n      this.state.noArrowParamsConversionAt.push(this.state.start);\n\n      const consequent = this.parseMaybeAssign();\n      const failed = !this.match(tt.colon);\n\n      this.state.noArrowParamsConversionAt.pop();\n\n      return { consequent, failed };\n    }\n\n    // Given an expression, walks through out its arrow functions whose body is\n    // an expression and through out conditional expressions. It returns every\n    // function which has been parsed with a return type but could have been\n    // parenthesized expressions.\n    // These functions are separated into two arrays: one containing the ones\n    // whose parameters can be converted to assignable lists, one containing the\n    // others.\n    getArrowLikeExpressions(\n      node: N.Expression,\n      disallowInvalid?: boolean,\n    ): [N.ArrowFunctionExpression[], N.ArrowFunctionExpression[]] {\n      const stack = [node];\n      const arrows: N.ArrowFunctionExpression[] = [];\n\n      while (stack.length !== 0) {\n        const node = stack.pop();\n        if (node.type === \"ArrowFunctionExpression\") {\n          if (node.typeParameters || !node.returnType) {\n            // This is an arrow expression without ambiguity, so check its parameters\n            this.finishArrowValidation(node);\n          } else {\n            arrows.push(node);\n          }\n          stack.push(node.body);\n        } else if (node.type === \"ConditionalExpression\") {\n          stack.push(node.consequent);\n          stack.push(node.alternate);\n        }\n      }\n\n      if (disallowInvalid) {\n        arrows.forEach(node => this.finishArrowValidation(node));\n        return [arrows, []];\n      }\n\n      return partition(arrows, node =>\n        node.params.every(param => this.isAssignable(param, true)),\n      );\n    }\n\n    finishArrowValidation(node: N.ArrowFunctionExpression) {\n      this.toAssignableList(\n        // node.params is Expression[] instead of $ReadOnlyArray<Pattern> because it\n        // has not been converted yet.\n        ((node.params: any): N.Expression[]),\n        node.extra?.trailingComma,\n      );\n      // Enter scope, as checkParams defines bindings\n      this.scope.enter(SCOPE_FUNCTION | SCOPE_ARROW);\n      // Use super's method to force the parameters to be checked\n      super.checkParams(node, false, true);\n      this.scope.exit();\n    }\n\n    forwardNoArrowParamsConversionAt<T>(node: N.Node, parse: () => T): T {\n      let result: T;\n      if (this.state.noArrowParamsConversionAt.indexOf(node.start) !== -1) {\n        this.state.noArrowParamsConversionAt.push(this.state.start);\n        result = parse();\n        this.state.noArrowParamsConversionAt.pop();\n      } else {\n        result = parse();\n      }\n\n      return result;\n    }\n\n    parseParenItem(\n      node: N.Expression,\n      startPos: number,\n      startLoc: Position,\n    ): N.Expression {\n      node = super.parseParenItem(node, startPos, startLoc);\n      if (this.eat(tt.question)) {\n        node.optional = true;\n        // Include questionmark in location of node\n        // Don't use this.finishNode() as otherwise we might process comments twice and\n        // include already consumed parens\n        this.resetEndLocation(node);\n      }\n\n      if (this.match(tt.colon)) {\n        const typeCastNode = this.startNodeAt(startPos, startLoc);\n        typeCastNode.expression = node;\n        typeCastNode.typeAnnotation = this.flowParseTypeAnnotation();\n\n        return this.finishNode(typeCastNode, \"TypeCastExpression\");\n      }\n\n      return node;\n    }\n\n    assertModuleNodeAllowed(node: N.Node) {\n      if (\n        (node.type === \"ImportDeclaration\" &&\n          (node.importKind === \"type\" || node.importKind === \"typeof\")) ||\n        (node.type === \"ExportNamedDeclaration\" &&\n          node.exportKind === \"type\") ||\n        (node.type === \"ExportAllDeclaration\" && node.exportKind === \"type\")\n      ) {\n        // Allow Flowtype imports and exports in all conditions because\n        // Flow itself does not care about 'sourceType'.\n        return;\n      }\n\n      super.assertModuleNodeAllowed(node);\n    }\n\n    parseExport(node: N.Node): N.AnyExport {\n      const decl = super.parseExport(node);\n      if (\n        decl.type === \"ExportNamedDeclaration\" ||\n        decl.type === \"ExportAllDeclaration\"\n      ) {\n        decl.exportKind = decl.exportKind || \"value\";\n      }\n      return decl;\n    }\n\n    parseExportDeclaration(node: N.ExportNamedDeclaration): ?N.Declaration {\n      if (this.isContextual(\"type\")) {\n        node.exportKind = \"type\";\n\n        const declarationNode = this.startNode();\n        this.next();\n\n        if (this.match(tt.braceL)) {\n          // export type { foo, bar };\n          node.specifiers = this.parseExportSpecifiers();\n          this.parseExportFrom(node);\n          return null;\n        } else {\n          // export type Foo = Bar;\n          return this.flowParseTypeAlias(declarationNode);\n        }\n      } else if (this.isContextual(\"opaque\")) {\n        node.exportKind = \"type\";\n\n        const declarationNode = this.startNode();\n        this.next();\n        // export opaque type Foo = Bar;\n        return this.flowParseOpaqueType(declarationNode, false);\n      } else if (this.isContextual(\"interface\")) {\n        node.exportKind = \"type\";\n        const declarationNode = this.startNode();\n        this.next();\n        return this.flowParseInterface(declarationNode);\n      } else if (this.shouldParseEnums() && this.isContextual(\"enum\")) {\n        node.exportKind = \"value\";\n        const declarationNode = this.startNode();\n        this.next();\n        return this.flowParseEnumDeclaration(declarationNode);\n      } else {\n        return super.parseExportDeclaration(node);\n      }\n    }\n\n    eatExportStar(node: N.Node): boolean {\n      if (super.eatExportStar(...arguments)) return true;\n\n      if (this.isContextual(\"type\") && this.lookahead().type === tt.star) {\n        node.exportKind = \"type\";\n        this.next();\n        this.next();\n        return true;\n      }\n\n      return false;\n    }\n\n    maybeParseExportNamespaceSpecifier(node: N.Node): boolean {\n      const pos = this.state.start;\n      const hasNamespace = super.maybeParseExportNamespaceSpecifier(node);\n      if (hasNamespace && node.exportKind === \"type\") {\n        this.unexpected(pos);\n      }\n      return hasNamespace;\n    }\n\n    parseClassId(node: N.Class, isStatement: boolean, optionalId: ?boolean) {\n      super.parseClassId(node, isStatement, optionalId);\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      }\n    }\n\n    parseClassMember(\n      classBody: N.ClassBody,\n      member: any,\n      state: { hadConstructor: boolean },\n      constructorAllowsSuper: boolean,\n    ): void {\n      const pos = this.state.start;\n      if (this.isContextual(\"declare\")) {\n        if (this.parseClassMemberFromModifier(classBody, member)) {\n          // 'declare' is a class element name\n          return;\n        }\n\n        member.declare = true;\n      }\n\n      super.parseClassMember(classBody, member, state, constructorAllowsSuper);\n\n      if (member.declare) {\n        if (\n          member.type !== \"ClassProperty\" &&\n          member.type !== \"ClassPrivateProperty\"\n        ) {\n          this.raise(pos, FlowErrors.DeclareClassElement);\n        } else if (member.value) {\n          this.raise(\n            member.value.start,\n            FlowErrors.DeclareClassFieldInitializer,\n          );\n        }\n      }\n    }\n\n    // ensure that inside flow types, we bypass the jsx parser plugin\n    getTokenFromCode(code: number): void {\n      const next = this.input.charCodeAt(this.state.pos + 1);\n      if (code === charCodes.leftCurlyBrace && next === charCodes.verticalBar) {\n        return this.finishOp(tt.braceBarL, 2);\n      } else if (\n        this.state.inType &&\n        (code === charCodes.greaterThan || code === charCodes.lessThan)\n      ) {\n        return this.finishOp(tt.relational, 1);\n      } else if (isIteratorStart(code, next)) {\n        this.state.isIterator = true;\n        return super.readWord();\n      } else {\n        return super.getTokenFromCode(code);\n      }\n    }\n\n    isAssignable(node: N.Node, isBinding?: boolean): boolean {\n      switch (node.type) {\n        case \"Identifier\":\n        case \"ObjectPattern\":\n        case \"ArrayPattern\":\n        case \"AssignmentPattern\":\n          return true;\n\n        case \"ObjectExpression\": {\n          const last = node.properties.length - 1;\n          return node.properties.every((prop, i) => {\n            return (\n              prop.type !== \"ObjectMethod\" &&\n              (i === last || prop.type === \"SpreadElement\") &&\n              this.isAssignable(prop)\n            );\n          });\n        }\n\n        case \"ObjectProperty\":\n          return this.isAssignable(node.value);\n\n        case \"SpreadElement\":\n          return this.isAssignable(node.argument);\n\n        case \"ArrayExpression\":\n          return node.elements.every(element => this.isAssignable(element));\n\n        case \"AssignmentExpression\":\n          return node.operator === \"=\";\n\n        case \"ParenthesizedExpression\":\n        case \"TypeCastExpression\":\n          return this.isAssignable(node.expression);\n\n        case \"MemberExpression\":\n        case \"OptionalMemberExpression\":\n          return !isBinding;\n\n        default:\n          return false;\n      }\n    }\n\n    toAssignable(node: N.Node): N.Node {\n      if (node.type === \"TypeCastExpression\") {\n        return super.toAssignable(this.typeCastToParameter(node));\n      } else {\n        return super.toAssignable(node);\n      }\n    }\n\n    // turn type casts that we found in function parameter head into type annotated params\n    toAssignableList(\n      exprList: N.Expression[],\n      trailingCommaPos?: ?number,\n    ): $ReadOnlyArray<N.Pattern> {\n      for (let i = 0; i < exprList.length; i++) {\n        const expr = exprList[i];\n        if (expr && expr.type === \"TypeCastExpression\") {\n          exprList[i] = this.typeCastToParameter(expr);\n        }\n      }\n      return super.toAssignableList(exprList, trailingCommaPos);\n    }\n\n    // this is a list of nodes, from something like a call expression, we need to filter the\n    // type casts that we've found that are illegal in this context\n    toReferencedList(\n      exprList: $ReadOnlyArray<?N.Expression>,\n      isParenthesizedExpr?: boolean,\n    ): $ReadOnlyArray<?N.Expression> {\n      for (let i = 0; i < exprList.length; i++) {\n        const expr = exprList[i];\n        if (\n          expr &&\n          expr.type === \"TypeCastExpression\" &&\n          (!expr.extra || !expr.extra.parenthesized) &&\n          (exprList.length > 1 || !isParenthesizedExpr)\n        ) {\n          this.raise(expr.typeAnnotation.start, FlowErrors.TypeCastInPattern);\n        }\n      }\n\n      return exprList;\n    }\n\n    checkLVal(\n      expr: N.Expression,\n      bindingType: BindingTypes = BIND_NONE,\n      checkClashes: ?{ [key: string]: boolean },\n      contextDescription: string,\n    ): void {\n      if (expr.type !== \"TypeCastExpression\") {\n        return super.checkLVal(\n          expr,\n          bindingType,\n          checkClashes,\n          contextDescription,\n        );\n      }\n    }\n\n    // parse class property type annotations\n    parseClassProperty(node: N.ClassProperty): N.ClassProperty {\n      if (this.match(tt.colon)) {\n        node.typeAnnotation = this.flowParseTypeAnnotation();\n      }\n      return super.parseClassProperty(node);\n    }\n\n    parseClassPrivateProperty(\n      node: N.ClassPrivateProperty,\n    ): N.ClassPrivateProperty {\n      if (this.match(tt.colon)) {\n        node.typeAnnotation = this.flowParseTypeAnnotation();\n      }\n      return super.parseClassPrivateProperty(node);\n    }\n\n    // determine whether or not we're currently in the position where a class method would appear\n    isClassMethod(): boolean {\n      return this.isRelational(\"<\") || super.isClassMethod();\n    }\n\n    // determine whether or not we're currently in the position where a class property would appear\n    isClassProperty(): boolean {\n      return this.match(tt.colon) || super.isClassProperty();\n    }\n\n    isNonstaticConstructor(method: N.ClassMethod | N.ClassProperty): boolean {\n      return !this.match(tt.colon) && super.isNonstaticConstructor(method);\n    }\n\n    // parse type parameters for class methods\n    pushClassMethod(\n      classBody: N.ClassBody,\n      method: N.ClassMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isConstructor: boolean,\n      allowsDirectSuper: boolean,\n    ): void {\n      if ((method: $FlowFixMe).variance) {\n        this.unexpected((method: $FlowFixMe).variance.start);\n      }\n      delete (method: $FlowFixMe).variance;\n      if (this.isRelational(\"<\")) {\n        method.typeParameters = this.flowParseTypeParameterDeclaration();\n      }\n\n      super.pushClassMethod(\n        classBody,\n        method,\n        isGenerator,\n        isAsync,\n        isConstructor,\n        allowsDirectSuper,\n      );\n    }\n\n    pushClassPrivateMethod(\n      classBody: N.ClassBody,\n      method: N.ClassPrivateMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n    ): void {\n      if ((method: $FlowFixMe).variance) {\n        this.unexpected((method: $FlowFixMe).variance.start);\n      }\n      delete (method: $FlowFixMe).variance;\n      if (this.isRelational(\"<\")) {\n        method.typeParameters = this.flowParseTypeParameterDeclaration();\n      }\n\n      super.pushClassPrivateMethod(classBody, method, isGenerator, isAsync);\n    }\n\n    // parse a the super class type parameters and implements\n    parseClassSuper(node: N.Class): void {\n      super.parseClassSuper(node);\n      if (node.superClass && this.isRelational(\"<\")) {\n        node.superTypeParameters = this.flowParseTypeParameterInstantiation();\n      }\n      if (this.isContextual(\"implements\")) {\n        this.next();\n        const implemented: N.FlowClassImplements[] = (node.implements = []);\n        do {\n          const node = this.startNode();\n          node.id = this.flowParseRestrictedIdentifier(/*liberal*/ true);\n          if (this.isRelational(\"<\")) {\n            node.typeParameters = this.flowParseTypeParameterInstantiation();\n          } else {\n            node.typeParameters = null;\n          }\n          implemented.push(this.finishNode(node, \"ClassImplements\"));\n        } while (this.eat(tt.comma));\n      }\n    }\n\n    parsePropertyName(\n      node: N.ObjectOrClassMember | N.ClassMember | N.TsNamedTypeElementBase,\n      isPrivateNameAllowed: boolean,\n    ): N.Identifier {\n      const variance = this.flowParseVariance();\n      const key = super.parsePropertyName(node, isPrivateNameAllowed);\n      // $FlowIgnore (\"variance\" not defined on TsNamedTypeElementBase)\n      node.variance = variance;\n      return key;\n    }\n\n    // parse type parameters for object method shorthand\n    parseObjPropValue(\n      prop: N.ObjectMember,\n      startPos: ?number,\n      startLoc: ?Position,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isPattern: boolean,\n      refExpressionErrors: ?ExpressionErrors,\n      containsEsc: boolean,\n    ): void {\n      if ((prop: $FlowFixMe).variance) {\n        this.unexpected((prop: $FlowFixMe).variance.start);\n      }\n      delete (prop: $FlowFixMe).variance;\n\n      let typeParameters;\n\n      // method shorthand\n      if (this.isRelational(\"<\")) {\n        typeParameters = this.flowParseTypeParameterDeclaration();\n        if (!this.match(tt.parenL)) this.unexpected();\n      }\n\n      super.parseObjPropValue(\n        prop,\n        startPos,\n        startLoc,\n        isGenerator,\n        isAsync,\n        isPattern,\n        refExpressionErrors,\n        containsEsc,\n      );\n\n      // add typeParameters if we found them\n      if (typeParameters) {\n        (prop.value || prop).typeParameters = typeParameters;\n      }\n    }\n\n    parseAssignableListItemTypes(param: N.Pattern): N.Pattern {\n      if (this.eat(tt.question)) {\n        if (param.type !== \"Identifier\") {\n          this.raise(param.start, FlowErrors.OptionalBindingPattern);\n        }\n\n        ((param: any): N.Identifier).optional = true;\n      }\n      if (this.match(tt.colon)) {\n        param.typeAnnotation = this.flowParseTypeAnnotation();\n      }\n      this.resetEndLocation(param);\n      return param;\n    }\n\n    parseMaybeDefault(\n      startPos?: ?number,\n      startLoc?: ?Position,\n      left?: ?N.Pattern,\n    ): N.Pattern {\n      const node = super.parseMaybeDefault(startPos, startLoc, left);\n\n      if (\n        node.type === \"AssignmentPattern\" &&\n        node.typeAnnotation &&\n        node.right.start < node.typeAnnotation.start\n      ) {\n        this.raise(node.typeAnnotation.start, FlowErrors.TypeBeforeInitializer);\n      }\n\n      return node;\n    }\n\n    shouldParseDefaultImport(node: N.ImportDeclaration): boolean {\n      if (!hasTypeImportKind(node)) {\n        return super.shouldParseDefaultImport(node);\n      }\n\n      return isMaybeDefaultImport(this.state);\n    }\n\n    parseImportSpecifierLocal(\n      node: N.ImportDeclaration,\n      specifier: N.Node,\n      type: string,\n      contextDescription: string,\n    ): void {\n      specifier.local = hasTypeImportKind(node)\n        ? this.flowParseRestrictedIdentifier(\n            /* liberal */ true,\n            /* declaration */ true,\n          )\n        : this.parseIdentifier();\n\n      this.checkLVal(\n        specifier.local,\n        BIND_LEXICAL,\n        undefined,\n        contextDescription,\n      );\n      node.specifiers.push(this.finishNode(specifier, type));\n    }\n\n    // parse typeof and type imports\n    maybeParseDefaultImportSpecifier(node: N.ImportDeclaration): boolean {\n      node.importKind = \"value\";\n\n      let kind = null;\n      if (this.match(tt._typeof)) {\n        kind = \"typeof\";\n      } else if (this.isContextual(\"type\")) {\n        kind = \"type\";\n      }\n      if (kind) {\n        const lh = this.lookahead();\n\n        // import type * is not allowed\n        if (kind === \"type\" && lh.type === tt.star) {\n          this.unexpected(lh.start);\n        }\n\n        if (\n          isMaybeDefaultImport(lh) ||\n          lh.type === tt.braceL ||\n          lh.type === tt.star\n        ) {\n          this.next();\n          node.importKind = kind;\n        }\n      }\n\n      return super.maybeParseDefaultImportSpecifier(node);\n    }\n\n    // parse import-type/typeof shorthand\n    parseImportSpecifier(node: N.ImportDeclaration): void {\n      const specifier = this.startNode();\n      const firstIdentLoc = this.state.start;\n      const firstIdent = this.parseIdentifier(true);\n\n      let specifierTypeKind = null;\n      if (firstIdent.name === \"type\") {\n        specifierTypeKind = \"type\";\n      } else if (firstIdent.name === \"typeof\") {\n        specifierTypeKind = \"typeof\";\n      }\n\n      let isBinding = false;\n      if (this.isContextual(\"as\") && !this.isLookaheadContextual(\"as\")) {\n        const as_ident = this.parseIdentifier(true);\n        if (\n          specifierTypeKind !== null &&\n          !this.match(tt.name) &&\n          !this.state.type.keyword\n        ) {\n          // `import {type as ,` or `import {type as }`\n          specifier.imported = as_ident;\n          specifier.importKind = specifierTypeKind;\n          specifier.local = as_ident.__clone();\n        } else {\n          // `import {type as foo`\n          specifier.imported = firstIdent;\n          specifier.importKind = null;\n          specifier.local = this.parseIdentifier();\n        }\n      } else if (\n        specifierTypeKind !== null &&\n        (this.match(tt.name) || this.state.type.keyword)\n      ) {\n        // `import {type foo`\n        specifier.imported = this.parseIdentifier(true);\n        specifier.importKind = specifierTypeKind;\n        if (this.eatContextual(\"as\")) {\n          specifier.local = this.parseIdentifier();\n        } else {\n          isBinding = true;\n          specifier.local = specifier.imported.__clone();\n        }\n      } else {\n        isBinding = true;\n        specifier.imported = firstIdent;\n        specifier.importKind = null;\n        specifier.local = specifier.imported.__clone();\n      }\n\n      const nodeIsTypeImport = hasTypeImportKind(node);\n      const specifierIsTypeImport = hasTypeImportKind(specifier);\n\n      if (nodeIsTypeImport && specifierIsTypeImport) {\n        this.raise(\n          firstIdentLoc,\n          FlowErrors.ImportTypeShorthandOnlyInPureImport,\n        );\n      }\n\n      if (nodeIsTypeImport || specifierIsTypeImport) {\n        this.checkReservedType(\n          specifier.local.name,\n          specifier.local.start,\n          /* declaration */ true,\n        );\n      }\n\n      if (isBinding && !nodeIsTypeImport && !specifierIsTypeImport) {\n        this.checkReservedWord(\n          specifier.local.name,\n          specifier.start,\n          true,\n          true,\n        );\n      }\n\n      this.checkLVal(\n        specifier.local,\n        BIND_LEXICAL,\n        undefined,\n        \"import specifier\",\n      );\n      node.specifiers.push(this.finishNode(specifier, \"ImportSpecifier\"));\n    }\n\n    // parse function type parameters - function foo<T>() {}\n    parseFunctionParams(node: N.Function, allowModifiers?: boolean): void {\n      // $FlowFixMe\n      const kind = node.kind;\n      if (kind !== \"get\" && kind !== \"set\" && this.isRelational(\"<\")) {\n        node.typeParameters = this.flowParseTypeParameterDeclaration();\n      }\n      super.parseFunctionParams(node, allowModifiers);\n    }\n\n    // parse flow type annotations on variable declarator heads - let foo: string = bar\n    parseVarId(\n      decl: N.VariableDeclarator,\n      kind: \"var\" | \"let\" | \"const\",\n    ): void {\n      super.parseVarId(decl, kind);\n      if (this.match(tt.colon)) {\n        decl.id.typeAnnotation = this.flowParseTypeAnnotation();\n        this.resetEndLocation(decl.id); // set end position to end of type\n      }\n    }\n\n    // parse the return type of an async arrow function - let foo = (async (): number => {});\n    parseAsyncArrowFromCallExpression(\n      node: N.ArrowFunctionExpression,\n      call: N.CallExpression,\n    ): N.ArrowFunctionExpression {\n      if (this.match(tt.colon)) {\n        const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n        this.state.noAnonFunctionType = true;\n        node.returnType = this.flowParseTypeAnnotation();\n        this.state.noAnonFunctionType = oldNoAnonFunctionType;\n      }\n\n      return super.parseAsyncArrowFromCallExpression(node, call);\n    }\n\n    // todo description\n    shouldParseAsyncArrow(): boolean {\n      return this.match(tt.colon) || super.shouldParseAsyncArrow();\n    }\n\n    // We need to support type parameter declarations for arrow functions. This\n    // is tricky. There are three situations we need to handle\n    //\n    // 1. This is either JSX or an arrow function. We'll try JSX first. If that\n    //    fails, we'll try an arrow function. If that fails, we'll throw the JSX\n    //    error.\n    // 2. This is an arrow function. We'll parse the type parameter declaration,\n    //    parse the rest, make sure the rest is an arrow function, and go from\n    //    there\n    // 3. This is neither. Just call the super method\n    parseMaybeAssign(\n      noIn?: ?boolean,\n      refExpressionErrors?: ?ExpressionErrors,\n      afterLeftParse?: Function,\n      refNeedsArrowPos?: ?Pos,\n    ): N.Expression {\n      let state = null;\n\n      let jsx;\n\n      if (\n        this.hasPlugin(\"jsx\") &&\n        (this.match(tt.jsxTagStart) || this.isRelational(\"<\"))\n      ) {\n        state = this.state.clone();\n\n        jsx = this.tryParse(\n          () =>\n            super.parseMaybeAssign(\n              noIn,\n              refExpressionErrors,\n              afterLeftParse,\n              refNeedsArrowPos,\n            ),\n          state,\n        );\n        /*:: invariant(!jsx.aborted) */\n\n        if (!jsx.error) return jsx.node;\n\n        // Remove `tc.j_expr` and `tc.j_oTag` from context added\n        // by parsing `jsxTagStart` to stop the JSX plugin from\n        // messing with the tokens\n        const { context } = this.state;\n        if (context[context.length - 1] === tc.j_oTag) {\n          context.length -= 2;\n        } else if (context[context.length - 1] === tc.j_expr) {\n          context.length -= 1;\n        }\n      }\n\n      if ((jsx && jsx.error) || this.isRelational(\"<\")) {\n        state = state || this.state.clone();\n\n        let typeParameters;\n\n        const arrow = this.tryParse(() => {\n          typeParameters = this.flowParseTypeParameterDeclaration();\n\n          const arrowExpression = this.forwardNoArrowParamsConversionAt(\n            typeParameters,\n            () =>\n              super.parseMaybeAssign(\n                noIn,\n                refExpressionErrors,\n                afterLeftParse,\n                refNeedsArrowPos,\n              ),\n          );\n          arrowExpression.typeParameters = typeParameters;\n          this.resetStartLocationFromNode(arrowExpression, typeParameters);\n\n          return arrowExpression;\n        }, state);\n\n        const arrowExpression: ?N.ArrowFunctionExpression =\n          arrow.node && arrow.node.type === \"ArrowFunctionExpression\"\n            ? arrow.node\n            : null;\n\n        if (!arrow.error && arrowExpression) return arrowExpression;\n\n        // If we are here, both JSX and Flow parsing attemps failed.\n        // Give the precedence to the JSX error, except if JSX had an\n        // unrecoverable error while Flow didn't.\n        // If the error is recoverable, we can only re-report it if there is\n        // a node we can return.\n\n        if (jsx && jsx.node) {\n          /*:: invariant(jsx.failState) */\n          this.state = jsx.failState;\n          return jsx.node;\n        }\n\n        if (arrowExpression) {\n          /*:: invariant(arrow.failState) */\n          this.state = arrow.failState;\n          return arrowExpression;\n        }\n\n        if (jsx && jsx.thrown) throw jsx.error;\n        if (arrow.thrown) throw arrow.error;\n\n        /*:: invariant(typeParameters) */\n        throw this.raise(\n          typeParameters.start,\n          FlowErrors.UnexpectedTokenAfterTypeParameter,\n        );\n      }\n\n      return super.parseMaybeAssign(\n        noIn,\n        refExpressionErrors,\n        afterLeftParse,\n        refNeedsArrowPos,\n      );\n    }\n\n    // handle return types for arrow functions\n    parseArrow(node: N.ArrowFunctionExpression): ?N.ArrowFunctionExpression {\n      if (this.match(tt.colon)) {\n        const result = this.tryParse(() => {\n          const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n          this.state.noAnonFunctionType = true;\n\n          const typeNode = this.startNode();\n\n          [\n            // $FlowFixMe (destructuring not supported yet)\n            typeNode.typeAnnotation,\n            // $FlowFixMe (destructuring not supported yet)\n            node.predicate,\n          ] = this.flowParseTypeAndPredicateInitialiser();\n\n          this.state.noAnonFunctionType = oldNoAnonFunctionType;\n\n          if (this.canInsertSemicolon()) this.unexpected();\n          if (!this.match(tt.arrow)) this.unexpected();\n\n          return typeNode;\n        });\n\n        if (result.thrown) return null;\n        /*:: invariant(result.node) */\n\n        if (result.error) this.state = result.failState;\n\n        // assign after it is clear it is an arrow\n        node.returnType = result.node.typeAnnotation\n          ? this.finishNode(result.node, \"TypeAnnotation\")\n          : null;\n      }\n\n      return super.parseArrow(node);\n    }\n\n    shouldParseArrow(): boolean {\n      return this.match(tt.colon) || super.shouldParseArrow();\n    }\n\n    setArrowFunctionParameters(\n      node: N.ArrowFunctionExpression,\n      params: N.Expression[],\n    ): void {\n      if (this.state.noArrowParamsConversionAt.indexOf(node.start) !== -1) {\n        node.params = params;\n      } else {\n        super.setArrowFunctionParameters(node, params);\n      }\n    }\n\n    checkParams(\n      node: N.Function,\n      allowDuplicates: boolean,\n      isArrowFunction: ?boolean,\n    ): void {\n      if (\n        isArrowFunction &&\n        this.state.noArrowParamsConversionAt.indexOf(node.start) !== -1\n      ) {\n        return;\n      }\n\n      return super.checkParams(...arguments);\n    }\n\n    parseParenAndDistinguishExpression(canBeArrow: boolean): N.Expression {\n      return super.parseParenAndDistinguishExpression(\n        canBeArrow && this.state.noArrowAt.indexOf(this.state.start) === -1,\n      );\n    }\n\n    parseSubscripts(\n      base: N.Expression,\n      startPos: number,\n      startLoc: Position,\n      noCalls?: ?boolean,\n    ): N.Expression {\n      if (\n        base.type === \"Identifier\" &&\n        base.name === \"async\" &&\n        this.state.noArrowAt.indexOf(startPos) !== -1\n      ) {\n        this.next();\n\n        const node = this.startNodeAt(startPos, startLoc);\n        node.callee = base;\n        node.arguments = this.parseCallExpressionArguments(tt.parenR, false);\n        base = this.finishNode(node, \"CallExpression\");\n      } else if (\n        base.type === \"Identifier\" &&\n        base.name === \"async\" &&\n        this.isRelational(\"<\")\n      ) {\n        const state = this.state.clone();\n        const arrow = this.tryParse(\n          abort =>\n            this.parseAsyncArrowWithTypeParameters(startPos, startLoc) ||\n            abort(),\n          state,\n        );\n\n        if (!arrow.error && !arrow.aborted) return arrow.node;\n\n        const result = this.tryParse(\n          () => super.parseSubscripts(base, startPos, startLoc, noCalls),\n          state,\n        );\n\n        if (result.node && !result.error) return result.node;\n\n        if (arrow.node) {\n          this.state = arrow.failState;\n          return arrow.node;\n        }\n\n        if (result.node) {\n          this.state = result.failState;\n          return result.node;\n        }\n\n        throw arrow.error || result.error;\n      }\n\n      return super.parseSubscripts(base, startPos, startLoc, noCalls);\n    }\n\n    parseSubscript(\n      base: N.Expression,\n      startPos: number,\n      startLoc: Position,\n      noCalls: ?boolean,\n      subscriptState: N.ParseSubscriptState,\n    ): N.Expression {\n      if (this.match(tt.questionDot) && this.isLookaheadRelational(\"<\")) {\n        subscriptState.optionalChainMember = true;\n        if (noCalls) {\n          subscriptState.stop = true;\n          return base;\n        }\n        this.next();\n        const node: N.OptionalCallExpression = this.startNodeAt(\n          startPos,\n          startLoc,\n        );\n        node.callee = base;\n        node.typeArguments = this.flowParseTypeParameterInstantiation();\n        this.expect(tt.parenL);\n        // $FlowFixMe\n        node.arguments = this.parseCallExpressionArguments(tt.parenR, false);\n        node.optional = true;\n        return this.finishCallExpression(node, /* optional */ true);\n      } else if (\n        !noCalls &&\n        this.shouldParseTypes() &&\n        this.isRelational(\"<\")\n      ) {\n        const node = this.startNodeAt(startPos, startLoc);\n        node.callee = base;\n\n        const result = this.tryParse(() => {\n          node.typeArguments = this.flowParseTypeParameterInstantiationCallOrNew();\n          this.expect(tt.parenL);\n          node.arguments = this.parseCallExpressionArguments(tt.parenR, false);\n          if (subscriptState.optionalChainMember) node.optional = false;\n          return this.finishCallExpression(\n            node,\n            subscriptState.optionalChainMember,\n          );\n        });\n\n        if (result.node) {\n          if (result.error) this.state = result.failState;\n          return result.node;\n        }\n      }\n\n      return super.parseSubscript(\n        base,\n        startPos,\n        startLoc,\n        noCalls,\n        subscriptState,\n      );\n    }\n\n    parseNewArguments(node: N.NewExpression): void {\n      let targs = null;\n      if (this.shouldParseTypes() && this.isRelational(\"<\")) {\n        targs = this.tryParse(() =>\n          this.flowParseTypeParameterInstantiationCallOrNew(),\n        ).node;\n      }\n      node.typeArguments = targs;\n\n      super.parseNewArguments(node);\n    }\n\n    parseAsyncArrowWithTypeParameters(\n      startPos: number,\n      startLoc: Position,\n    ): ?N.ArrowFunctionExpression {\n      const node = this.startNodeAt(startPos, startLoc);\n      this.parseFunctionParams(node);\n      if (!this.parseArrow(node)) return;\n      return this.parseArrowExpression(\n        node,\n        /* params */ undefined,\n        /* isAsync */ true,\n      );\n    }\n\n    readToken_mult_modulo(code: number): void {\n      const next = this.input.charCodeAt(this.state.pos + 1);\n      if (\n        code === charCodes.asterisk &&\n        next === charCodes.slash &&\n        this.state.hasFlowComment\n      ) {\n        this.state.hasFlowComment = false;\n        this.state.pos += 2;\n        this.nextToken();\n        return;\n      }\n\n      super.readToken_mult_modulo(code);\n    }\n\n    readToken_pipe_amp(code: number): void {\n      const next = this.input.charCodeAt(this.state.pos + 1);\n      if (\n        code === charCodes.verticalBar &&\n        next === charCodes.rightCurlyBrace\n      ) {\n        // '|}'\n        this.finishOp(tt.braceBarR, 2);\n        return;\n      }\n\n      super.readToken_pipe_amp(code);\n    }\n\n    parseTopLevel(file: N.File, program: N.Program): N.File {\n      const fileNode = super.parseTopLevel(file, program);\n      if (this.state.hasFlowComment) {\n        this.raise(this.state.pos, FlowErrors.UnterminatedFlowComment);\n      }\n      return fileNode;\n    }\n\n    skipBlockComment(): void {\n      if (this.hasPlugin(\"flowComments\") && this.skipFlowComment()) {\n        if (this.state.hasFlowComment) {\n          this.unexpected(null, FlowErrors.NestedFlowComment);\n        }\n        this.hasFlowCommentCompletion();\n        this.state.pos += this.skipFlowComment();\n        this.state.hasFlowComment = true;\n        return;\n      }\n\n      if (this.state.hasFlowComment) {\n        const end = this.input.indexOf(\"*-/\", (this.state.pos += 2));\n        if (end === -1) {\n          throw this.raise(this.state.pos - 2, Errors.UnterminatedComment);\n        }\n        this.state.pos = end + 3;\n        return;\n      }\n\n      super.skipBlockComment();\n    }\n\n    skipFlowComment(): number | boolean {\n      const { pos } = this.state;\n      let shiftToFirstNonWhiteSpace = 2;\n      while (\n        [charCodes.space, charCodes.tab].includes(\n          this.input.charCodeAt(pos + shiftToFirstNonWhiteSpace),\n        )\n      ) {\n        shiftToFirstNonWhiteSpace++;\n      }\n\n      const ch2 = this.input.charCodeAt(shiftToFirstNonWhiteSpace + pos);\n      const ch3 = this.input.charCodeAt(shiftToFirstNonWhiteSpace + pos + 1);\n\n      if (ch2 === charCodes.colon && ch3 === charCodes.colon) {\n        return shiftToFirstNonWhiteSpace + 2; // check for /*::\n      }\n      if (\n        this.input.slice(\n          shiftToFirstNonWhiteSpace + pos,\n          shiftToFirstNonWhiteSpace + pos + 12,\n        ) === \"flow-include\"\n      ) {\n        return shiftToFirstNonWhiteSpace + 12; // check for /*flow-include\n      }\n      if (ch2 === charCodes.colon && ch3 !== charCodes.colon) {\n        return shiftToFirstNonWhiteSpace; // check for /*:, advance up to :\n      }\n      return false;\n    }\n\n    hasFlowCommentCompletion(): void {\n      const end = this.input.indexOf(\"*/\", this.state.pos);\n      if (end === -1) {\n        throw this.raise(this.state.pos, Errors.UnterminatedComment);\n      }\n    }\n\n    // Flow enum parsing\n\n    flowEnumErrorBooleanMemberNotInitialized(\n      pos: number,\n      { enumName, memberName }: { enumName: string, memberName: string },\n    ): void {\n      this.raise(\n        pos,\n        FlowErrors.EnumBooleanMemberNotInitialized,\n        memberName,\n        enumName,\n      );\n    }\n\n    flowEnumErrorInvalidMemberName(\n      pos: number,\n      { enumName, memberName }: { enumName: string, memberName: string },\n    ): void {\n      const suggestion = memberName[0].toUpperCase() + memberName.slice(1);\n      this.raise(\n        pos,\n        FlowErrors.EnumInvalidMemberName,\n        memberName,\n        suggestion,\n        enumName,\n      );\n    }\n\n    flowEnumErrorDuplicateMemberName(\n      pos: number,\n      { enumName, memberName }: { enumName: string, memberName: string },\n    ): void {\n      this.raise(pos, FlowErrors.EnumDuplicateMemberName, memberName, enumName);\n    }\n\n    flowEnumErrorInconsistentMemberValues(\n      pos: number,\n      { enumName }: { enumName: string },\n    ): void {\n      this.raise(pos, FlowErrors.EnumInconsistentMemberValues, enumName);\n    }\n\n    flowEnumErrorInvalidExplicitType(\n      pos: number,\n      {\n        enumName,\n        suppliedType,\n      }: { enumName: string, suppliedType: null | string },\n    ) {\n      return this.raise(\n        pos,\n        suppliedType === null\n          ? FlowErrors.EnumInvalidExplicitTypeUnknownSupplied\n          : FlowErrors.EnumInvalidExplicitType,\n        enumName,\n        suppliedType,\n      );\n    }\n\n    flowEnumErrorInvalidMemberInitializer(\n      pos: number,\n      { enumName, explicitType, memberName }: EnumContext,\n    ) {\n      let message = null;\n      switch (explicitType) {\n        case \"boolean\":\n        case \"number\":\n        case \"string\":\n          message = FlowErrors.EnumInvalidMemberInitializerPrimaryType;\n          break;\n        case \"symbol\":\n          message = FlowErrors.EnumInvalidMemberInitializerSymbolType;\n          break;\n        default:\n          // null\n          message = FlowErrors.EnumInvalidMemberInitializerUnknownType;\n      }\n      return this.raise(pos, message, enumName, memberName, explicitType);\n    }\n\n    flowEnumErrorNumberMemberNotInitialized(\n      pos: number,\n      { enumName, memberName }: { enumName: string, memberName: string },\n    ): void {\n      this.raise(\n        pos,\n        FlowErrors.EnumNumberMemberNotInitialized,\n        enumName,\n        memberName,\n      );\n    }\n\n    flowEnumErrorStringMemberInconsistentlyInitailized(\n      pos: number,\n      { enumName }: { enumName: string },\n    ): void {\n      this.raise(\n        pos,\n        FlowErrors.EnumStringMemberInconsistentlyInitailized,\n        enumName,\n      );\n    }\n\n    flowEnumMemberInit(): EnumMemberInit {\n      const startPos = this.state.start;\n      const endOfInit = () => this.match(tt.comma) || this.match(tt.braceR);\n      switch (this.state.type) {\n        case tt.num: {\n          const literal = this.parseLiteral(this.state.value, \"NumericLiteral\");\n          if (endOfInit()) {\n            return { type: \"number\", pos: literal.start, value: literal };\n          }\n          return { type: \"invalid\", pos: startPos };\n        }\n        case tt.string: {\n          const literal = this.parseLiteral(this.state.value, \"StringLiteral\");\n          if (endOfInit()) {\n            return { type: \"string\", pos: literal.start, value: literal };\n          }\n          return { type: \"invalid\", pos: startPos };\n        }\n        case tt._true:\n        case tt._false: {\n          const literal = this.parseBooleanLiteral();\n          if (endOfInit()) {\n            return {\n              type: \"boolean\",\n              pos: literal.start,\n              value: literal,\n            };\n          }\n          return { type: \"invalid\", pos: startPos };\n        }\n        default:\n          return { type: \"invalid\", pos: startPos };\n      }\n    }\n\n    flowEnumMemberRaw(): { id: N.Node, init: EnumMemberInit } {\n      const pos = this.state.start;\n      const id = this.parseIdentifier(true);\n      const init = this.eat(tt.eq)\n        ? this.flowEnumMemberInit()\n        : { type: \"none\", pos };\n      return { id, init };\n    }\n\n    flowEnumCheckExplicitTypeMismatch(\n      pos: number,\n      context: EnumContext,\n      expectedType: EnumExplicitType,\n    ): void {\n      const { explicitType } = context;\n      if (explicitType === null) {\n        return;\n      }\n      if (explicitType !== expectedType) {\n        this.flowEnumErrorInvalidMemberInitializer(pos, context);\n      }\n    }\n\n    flowEnumMembers({\n      enumName,\n      explicitType,\n    }: {\n      enumName: string,\n      explicitType: EnumExplicitType,\n    }): {|\n      booleanMembers: Array<N.Node>,\n      numberMembers: Array<N.Node>,\n      stringMembers: Array<N.Node>,\n      defaultedMembers: Array<N.Node>,\n    |} {\n      const seenNames = new Set();\n      const members = {\n        booleanMembers: [],\n        numberMembers: [],\n        stringMembers: [],\n        defaultedMembers: [],\n      };\n      while (!this.match(tt.braceR)) {\n        const memberNode = this.startNode();\n        const { id, init } = this.flowEnumMemberRaw();\n        const memberName = id.name;\n        if (memberName === \"\") {\n          continue;\n        }\n        if (/^[a-z]/.test(memberName)) {\n          this.flowEnumErrorInvalidMemberName(id.start, {\n            enumName,\n            memberName,\n          });\n        }\n        if (seenNames.has(memberName)) {\n          this.flowEnumErrorDuplicateMemberName(id.start, {\n            enumName,\n            memberName,\n          });\n        }\n        seenNames.add(memberName);\n        const context = { enumName, explicitType, memberName };\n        memberNode.id = id;\n        switch (init.type) {\n          case \"boolean\": {\n            this.flowEnumCheckExplicitTypeMismatch(\n              init.pos,\n              context,\n              \"boolean\",\n            );\n            memberNode.init = init.value;\n            members.booleanMembers.push(\n              this.finishNode(memberNode, \"EnumBooleanMember\"),\n            );\n            break;\n          }\n          case \"number\": {\n            this.flowEnumCheckExplicitTypeMismatch(init.pos, context, \"number\");\n            memberNode.init = init.value;\n            members.numberMembers.push(\n              this.finishNode(memberNode, \"EnumNumberMember\"),\n            );\n            break;\n          }\n          case \"string\": {\n            this.flowEnumCheckExplicitTypeMismatch(init.pos, context, \"string\");\n            memberNode.init = init.value;\n            members.stringMembers.push(\n              this.finishNode(memberNode, \"EnumStringMember\"),\n            );\n            break;\n          }\n          case \"invalid\": {\n            throw this.flowEnumErrorInvalidMemberInitializer(init.pos, context);\n          }\n          case \"none\": {\n            switch (explicitType) {\n              case \"boolean\":\n                this.flowEnumErrorBooleanMemberNotInitialized(\n                  init.pos,\n                  context,\n                );\n                break;\n              case \"number\":\n                this.flowEnumErrorNumberMemberNotInitialized(init.pos, context);\n                break;\n              default:\n                members.defaultedMembers.push(\n                  this.finishNode(memberNode, \"EnumDefaultedMember\"),\n                );\n            }\n          }\n        }\n\n        if (!this.match(tt.braceR)) {\n          this.expect(tt.comma);\n        }\n      }\n      return members;\n    }\n\n    flowEnumStringMembers(\n      initializedMembers: Array<N.Node>,\n      defaultedMembers: Array<N.Node>,\n      { enumName }: { enumName: string },\n    ): Array<N.Node> {\n      if (initializedMembers.length === 0) {\n        return defaultedMembers;\n      } else if (defaultedMembers.length === 0) {\n        return initializedMembers;\n      } else if (defaultedMembers.length > initializedMembers.length) {\n        for (const member of initializedMembers) {\n          this.flowEnumErrorStringMemberInconsistentlyInitailized(\n            member.start,\n            { enumName },\n          );\n        }\n        return defaultedMembers;\n      } else {\n        for (const member of defaultedMembers) {\n          this.flowEnumErrorStringMemberInconsistentlyInitailized(\n            member.start,\n            { enumName },\n          );\n        }\n        return initializedMembers;\n      }\n    }\n\n    flowEnumParseExplicitType({\n      enumName,\n    }: {\n      enumName: string,\n    }): EnumExplicitType {\n      if (this.eatContextual(\"of\")) {\n        if (!this.match(tt.name)) {\n          throw this.flowEnumErrorInvalidExplicitType(this.state.start, {\n            enumName,\n            suppliedType: null,\n          });\n        }\n\n        const { value } = this.state;\n        this.next();\n\n        if (\n          value !== \"boolean\" &&\n          value !== \"number\" &&\n          value !== \"string\" &&\n          value !== \"symbol\"\n        ) {\n          this.flowEnumErrorInvalidExplicitType(this.state.start, {\n            enumName,\n            suppliedType: value,\n          });\n        }\n\n        return value;\n      }\n      return null;\n    }\n\n    flowEnumBody(node: N.Node, { enumName, nameLoc }): N.Node {\n      const explicitType = this.flowEnumParseExplicitType({ enumName });\n      this.expect(tt.braceL);\n      const members = this.flowEnumMembers({ enumName, explicitType });\n\n      switch (explicitType) {\n        case \"boolean\":\n          node.explicitType = true;\n          node.members = members.booleanMembers;\n          this.expect(tt.braceR);\n          return this.finishNode(node, \"EnumBooleanBody\");\n        case \"number\":\n          node.explicitType = true;\n          node.members = members.numberMembers;\n          this.expect(tt.braceR);\n          return this.finishNode(node, \"EnumNumberBody\");\n        case \"string\":\n          node.explicitType = true;\n          node.members = this.flowEnumStringMembers(\n            members.stringMembers,\n            members.defaultedMembers,\n            { enumName },\n          );\n          this.expect(tt.braceR);\n          return this.finishNode(node, \"EnumStringBody\");\n        case \"symbol\":\n          node.members = members.defaultedMembers;\n          this.expect(tt.braceR);\n          return this.finishNode(node, \"EnumSymbolBody\");\n        default: {\n          // `explicitType` is `null`\n          const empty = () => {\n            node.members = [];\n            this.expect(tt.braceR);\n            return this.finishNode(node, \"EnumStringBody\");\n          };\n          node.explicitType = false;\n\n          const boolsLen = members.booleanMembers.length;\n          const numsLen = members.numberMembers.length;\n          const strsLen = members.stringMembers.length;\n          const defaultedLen = members.defaultedMembers.length;\n\n          if (!boolsLen && !numsLen && !strsLen && !defaultedLen) {\n            return empty();\n          } else if (!boolsLen && !numsLen) {\n            node.members = this.flowEnumStringMembers(\n              members.stringMembers,\n              members.defaultedMembers,\n              { enumName },\n            );\n            this.expect(tt.braceR);\n            return this.finishNode(node, \"EnumStringBody\");\n          } else if (!numsLen && !strsLen && boolsLen >= defaultedLen) {\n            for (const member of members.defaultedMembers) {\n              this.flowEnumErrorBooleanMemberNotInitialized(member.start, {\n                enumName,\n                memberName: member.id.name,\n              });\n            }\n            node.members = members.booleanMembers;\n            this.expect(tt.braceR);\n            return this.finishNode(node, \"EnumBooleanBody\");\n          } else if (!boolsLen && !strsLen && numsLen >= defaultedLen) {\n            for (const member of members.defaultedMembers) {\n              this.flowEnumErrorNumberMemberNotInitialized(member.start, {\n                enumName,\n                memberName: member.id.name,\n              });\n            }\n            node.members = members.numberMembers;\n            this.expect(tt.braceR);\n            return this.finishNode(node, \"EnumNumberBody\");\n          } else {\n            this.flowEnumErrorInconsistentMemberValues(nameLoc, { enumName });\n            return empty();\n          }\n        }\n      }\n    }\n\n    flowParseEnumDeclaration(node: N.Node): N.Node {\n      const id = this.parseIdentifier();\n      node.id = id;\n      node.body = this.flowEnumBody(this.startNode(), {\n        enumName: id.name,\n        nameLoc: id.start,\n      });\n      return this.finishNode(node, \"EnumDeclaration\");\n    }\n  };\n","// @flow\n\nconst entities: { [name: string]: string } = {\n  quot: \"\\u0022\",\n  amp: \"&\",\n  apos: \"\\u0027\",\n  lt: \"<\",\n  gt: \">\",\n  nbsp: \"\\u00A0\",\n  iexcl: \"\\u00A1\",\n  cent: \"\\u00A2\",\n  pound: \"\\u00A3\",\n  curren: \"\\u00A4\",\n  yen: \"\\u00A5\",\n  brvbar: \"\\u00A6\",\n  sect: \"\\u00A7\",\n  uml: \"\\u00A8\",\n  copy: \"\\u00A9\",\n  ordf: \"\\u00AA\",\n  laquo: \"\\u00AB\",\n  not: \"\\u00AC\",\n  shy: \"\\u00AD\",\n  reg: \"\\u00AE\",\n  macr: \"\\u00AF\",\n  deg: \"\\u00B0\",\n  plusmn: \"\\u00B1\",\n  sup2: \"\\u00B2\",\n  sup3: \"\\u00B3\",\n  acute: \"\\u00B4\",\n  micro: \"\\u00B5\",\n  para: \"\\u00B6\",\n  middot: \"\\u00B7\",\n  cedil: \"\\u00B8\",\n  sup1: \"\\u00B9\",\n  ordm: \"\\u00BA\",\n  raquo: \"\\u00BB\",\n  frac14: \"\\u00BC\",\n  frac12: \"\\u00BD\",\n  frac34: \"\\u00BE\",\n  iquest: \"\\u00BF\",\n  Agrave: \"\\u00C0\",\n  Aacute: \"\\u00C1\",\n  Acirc: \"\\u00C2\",\n  Atilde: \"\\u00C3\",\n  Auml: \"\\u00C4\",\n  Aring: \"\\u00C5\",\n  AElig: \"\\u00C6\",\n  Ccedil: \"\\u00C7\",\n  Egrave: \"\\u00C8\",\n  Eacute: \"\\u00C9\",\n  Ecirc: \"\\u00CA\",\n  Euml: \"\\u00CB\",\n  Igrave: \"\\u00CC\",\n  Iacute: \"\\u00CD\",\n  Icirc: \"\\u00CE\",\n  Iuml: \"\\u00CF\",\n  ETH: \"\\u00D0\",\n  Ntilde: \"\\u00D1\",\n  Ograve: \"\\u00D2\",\n  Oacute: \"\\u00D3\",\n  Ocirc: \"\\u00D4\",\n  Otilde: \"\\u00D5\",\n  Ouml: \"\\u00D6\",\n  times: \"\\u00D7\",\n  Oslash: \"\\u00D8\",\n  Ugrave: \"\\u00D9\",\n  Uacute: \"\\u00DA\",\n  Ucirc: \"\\u00DB\",\n  Uuml: \"\\u00DC\",\n  Yacute: \"\\u00DD\",\n  THORN: \"\\u00DE\",\n  szlig: \"\\u00DF\",\n  agrave: \"\\u00E0\",\n  aacute: \"\\u00E1\",\n  acirc: \"\\u00E2\",\n  atilde: \"\\u00E3\",\n  auml: \"\\u00E4\",\n  aring: \"\\u00E5\",\n  aelig: \"\\u00E6\",\n  ccedil: \"\\u00E7\",\n  egrave: \"\\u00E8\",\n  eacute: \"\\u00E9\",\n  ecirc: \"\\u00EA\",\n  euml: \"\\u00EB\",\n  igrave: \"\\u00EC\",\n  iacute: \"\\u00ED\",\n  icirc: \"\\u00EE\",\n  iuml: \"\\u00EF\",\n  eth: \"\\u00F0\",\n  ntilde: \"\\u00F1\",\n  ograve: \"\\u00F2\",\n  oacute: \"\\u00F3\",\n  ocirc: \"\\u00F4\",\n  otilde: \"\\u00F5\",\n  ouml: \"\\u00F6\",\n  divide: \"\\u00F7\",\n  oslash: \"\\u00F8\",\n  ugrave: \"\\u00F9\",\n  uacute: \"\\u00FA\",\n  ucirc: \"\\u00FB\",\n  uuml: \"\\u00FC\",\n  yacute: \"\\u00FD\",\n  thorn: \"\\u00FE\",\n  yuml: \"\\u00FF\",\n  OElig: \"\\u0152\",\n  oelig: \"\\u0153\",\n  Scaron: \"\\u0160\",\n  scaron: \"\\u0161\",\n  Yuml: \"\\u0178\",\n  fnof: \"\\u0192\",\n  circ: \"\\u02C6\",\n  tilde: \"\\u02DC\",\n  Alpha: \"\\u0391\",\n  Beta: \"\\u0392\",\n  Gamma: \"\\u0393\",\n  Delta: \"\\u0394\",\n  Epsilon: \"\\u0395\",\n  Zeta: \"\\u0396\",\n  Eta: \"\\u0397\",\n  Theta: \"\\u0398\",\n  Iota: \"\\u0399\",\n  Kappa: \"\\u039A\",\n  Lambda: \"\\u039B\",\n  Mu: \"\\u039C\",\n  Nu: \"\\u039D\",\n  Xi: \"\\u039E\",\n  Omicron: \"\\u039F\",\n  Pi: \"\\u03A0\",\n  Rho: \"\\u03A1\",\n  Sigma: \"\\u03A3\",\n  Tau: \"\\u03A4\",\n  Upsilon: \"\\u03A5\",\n  Phi: \"\\u03A6\",\n  Chi: \"\\u03A7\",\n  Psi: \"\\u03A8\",\n  Omega: \"\\u03A9\",\n  alpha: \"\\u03B1\",\n  beta: \"\\u03B2\",\n  gamma: \"\\u03B3\",\n  delta: \"\\u03B4\",\n  epsilon: \"\\u03B5\",\n  zeta: \"\\u03B6\",\n  eta: \"\\u03B7\",\n  theta: \"\\u03B8\",\n  iota: \"\\u03B9\",\n  kappa: \"\\u03BA\",\n  lambda: \"\\u03BB\",\n  mu: \"\\u03BC\",\n  nu: \"\\u03BD\",\n  xi: \"\\u03BE\",\n  omicron: \"\\u03BF\",\n  pi: \"\\u03C0\",\n  rho: \"\\u03C1\",\n  sigmaf: \"\\u03C2\",\n  sigma: \"\\u03C3\",\n  tau: \"\\u03C4\",\n  upsilon: \"\\u03C5\",\n  phi: \"\\u03C6\",\n  chi: \"\\u03C7\",\n  psi: \"\\u03C8\",\n  omega: \"\\u03C9\",\n  thetasym: \"\\u03D1\",\n  upsih: \"\\u03D2\",\n  piv: \"\\u03D6\",\n  ensp: \"\\u2002\",\n  emsp: \"\\u2003\",\n  thinsp: \"\\u2009\",\n  zwnj: \"\\u200C\",\n  zwj: \"\\u200D\",\n  lrm: \"\\u200E\",\n  rlm: \"\\u200F\",\n  ndash: \"\\u2013\",\n  mdash: \"\\u2014\",\n  lsquo: \"\\u2018\",\n  rsquo: \"\\u2019\",\n  sbquo: \"\\u201A\",\n  ldquo: \"\\u201C\",\n  rdquo: \"\\u201D\",\n  bdquo: \"\\u201E\",\n  dagger: \"\\u2020\",\n  Dagger: \"\\u2021\",\n  bull: \"\\u2022\",\n  hellip: \"\\u2026\",\n  permil: \"\\u2030\",\n  prime: \"\\u2032\",\n  Prime: \"\\u2033\",\n  lsaquo: \"\\u2039\",\n  rsaquo: \"\\u203A\",\n  oline: \"\\u203E\",\n  frasl: \"\\u2044\",\n  euro: \"\\u20AC\",\n  image: \"\\u2111\",\n  weierp: \"\\u2118\",\n  real: \"\\u211C\",\n  trade: \"\\u2122\",\n  alefsym: \"\\u2135\",\n  larr: \"\\u2190\",\n  uarr: \"\\u2191\",\n  rarr: \"\\u2192\",\n  darr: \"\\u2193\",\n  harr: \"\\u2194\",\n  crarr: \"\\u21B5\",\n  lArr: \"\\u21D0\",\n  uArr: \"\\u21D1\",\n  rArr: \"\\u21D2\",\n  dArr: \"\\u21D3\",\n  hArr: \"\\u21D4\",\n  forall: \"\\u2200\",\n  part: \"\\u2202\",\n  exist: \"\\u2203\",\n  empty: \"\\u2205\",\n  nabla: \"\\u2207\",\n  isin: \"\\u2208\",\n  notin: \"\\u2209\",\n  ni: \"\\u220B\",\n  prod: \"\\u220F\",\n  sum: \"\\u2211\",\n  minus: \"\\u2212\",\n  lowast: \"\\u2217\",\n  radic: \"\\u221A\",\n  prop: \"\\u221D\",\n  infin: \"\\u221E\",\n  ang: \"\\u2220\",\n  and: \"\\u2227\",\n  or: \"\\u2228\",\n  cap: \"\\u2229\",\n  cup: \"\\u222A\",\n  int: \"\\u222B\",\n  there4: \"\\u2234\",\n  sim: \"\\u223C\",\n  cong: \"\\u2245\",\n  asymp: \"\\u2248\",\n  ne: \"\\u2260\",\n  equiv: \"\\u2261\",\n  le: \"\\u2264\",\n  ge: \"\\u2265\",\n  sub: \"\\u2282\",\n  sup: \"\\u2283\",\n  nsub: \"\\u2284\",\n  sube: \"\\u2286\",\n  supe: \"\\u2287\",\n  oplus: \"\\u2295\",\n  otimes: \"\\u2297\",\n  perp: \"\\u22A5\",\n  sdot: \"\\u22C5\",\n  lceil: \"\\u2308\",\n  rceil: \"\\u2309\",\n  lfloor: \"\\u230A\",\n  rfloor: \"\\u230B\",\n  lang: \"\\u2329\",\n  rang: \"\\u232A\",\n  loz: \"\\u25CA\",\n  spades: \"\\u2660\",\n  clubs: \"\\u2663\",\n  hearts: \"\\u2665\",\n  diams: \"\\u2666\",\n};\nexport default entities;\n","// @flow\n\nimport * as charCodes from \"charcodes\";\n\nimport XHTMLEntities from \"./xhtml\";\nimport type Parser from \"../../parser\";\nimport type { ExpressionErrors } from \"../../parser/util\";\nimport { TokenType, types as tt } from \"../../tokenizer/types\";\nimport { TokContext, types as tc } from \"../../tokenizer/context\";\nimport * as N from \"../../types\";\nimport { isIdentifierChar, isIdentifierStart } from \"../../util/identifier\";\nimport type { Position } from \"../../util/location\";\nimport { isNewLine } from \"../../util/whitespace\";\nimport { Errors } from \"../../parser/location\";\n\nconst HEX_NUMBER = /^[\\da-fA-F]+$/;\nconst DECIMAL_NUMBER = /^\\d+$/;\n\nconst JsxErrors = Object.freeze({\n  AttributeIsEmpty:\n    \"JSX attributes must only be assigned a non-empty expression\",\n  MissingClosingTagFragment: \"Expected corresponding JSX closing tag for <>\",\n  MissingClosingTagElement: \"Expected corresponding JSX closing tag for <%0>\",\n  UnsupportedJsxValue:\n    \"JSX value should be either an expression or a quoted JSX text\",\n  UnterminatedJsxContent: \"Unterminated JSX contents\",\n  UnwrappedAdjacentJSXElements:\n    \"Adjacent JSX elements must be wrapped in an enclosing tag. Did you want a JSX fragment <>...</>?\",\n});\n\n// Be aware that this file is always executed and not only when the plugin is enabled.\n// Therefore this contexts and tokens do always exist.\ntc.j_oTag = new TokContext(\"<tag\", false);\ntc.j_cTag = new TokContext(\"</tag\", false);\ntc.j_expr = new TokContext(\"<tag>...</tag>\", true, true);\n\ntt.jsxName = new TokenType(\"jsxName\");\ntt.jsxText = new TokenType(\"jsxText\", { beforeExpr: true });\ntt.jsxTagStart = new TokenType(\"jsxTagStart\", { startsExpr: true });\ntt.jsxTagEnd = new TokenType(\"jsxTagEnd\");\n\ntt.jsxTagStart.updateContext = function() {\n  this.state.context.push(tc.j_expr); // treat as beginning of JSX expression\n  this.state.context.push(tc.j_oTag); // start opening tag context\n  this.state.exprAllowed = false;\n};\n\ntt.jsxTagEnd.updateContext = function(prevType) {\n  const out = this.state.context.pop();\n  if ((out === tc.j_oTag && prevType === tt.slash) || out === tc.j_cTag) {\n    this.state.context.pop();\n    this.state.exprAllowed = this.curContext() === tc.j_expr;\n  } else {\n    this.state.exprAllowed = true;\n  }\n};\n\nfunction isFragment(object: ?N.JSXElement): boolean {\n  return object\n    ? object.type === \"JSXOpeningFragment\" ||\n        object.type === \"JSXClosingFragment\"\n    : false;\n}\n\n// Transforms JSX element name to string.\n\nfunction getQualifiedJSXName(\n  object: N.JSXIdentifier | N.JSXNamespacedName | N.JSXMemberExpression,\n): string {\n  if (object.type === \"JSXIdentifier\") {\n    return object.name;\n  }\n\n  if (object.type === \"JSXNamespacedName\") {\n    return object.namespace.name + \":\" + object.name.name;\n  }\n\n  if (object.type === \"JSXMemberExpression\") {\n    return (\n      getQualifiedJSXName(object.object) +\n      \".\" +\n      getQualifiedJSXName(object.property)\n    );\n  }\n\n  // istanbul ignore next\n  throw new Error(\"Node had unexpected type: \" + object.type);\n}\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    // Reads inline JSX contents token.\n\n    jsxReadToken(): void {\n      let out = \"\";\n      let chunkStart = this.state.pos;\n      for (;;) {\n        if (this.state.pos >= this.length) {\n          throw this.raise(this.state.start, JsxErrors.UnterminatedJsxContent);\n        }\n\n        const ch = this.input.charCodeAt(this.state.pos);\n\n        switch (ch) {\n          case charCodes.lessThan:\n          case charCodes.leftCurlyBrace:\n            if (this.state.pos === this.state.start) {\n              if (ch === charCodes.lessThan && this.state.exprAllowed) {\n                ++this.state.pos;\n                return this.finishToken(tt.jsxTagStart);\n              }\n              return super.getTokenFromCode(ch);\n            }\n            out += this.input.slice(chunkStart, this.state.pos);\n            return this.finishToken(tt.jsxText, out);\n\n          case charCodes.ampersand:\n            out += this.input.slice(chunkStart, this.state.pos);\n            out += this.jsxReadEntity();\n            chunkStart = this.state.pos;\n            break;\n\n          default:\n            if (isNewLine(ch)) {\n              out += this.input.slice(chunkStart, this.state.pos);\n              out += this.jsxReadNewLine(true);\n              chunkStart = this.state.pos;\n            } else {\n              ++this.state.pos;\n            }\n        }\n      }\n    }\n\n    jsxReadNewLine(normalizeCRLF: boolean): string {\n      const ch = this.input.charCodeAt(this.state.pos);\n      let out;\n      ++this.state.pos;\n      if (\n        ch === charCodes.carriageReturn &&\n        this.input.charCodeAt(this.state.pos) === charCodes.lineFeed\n      ) {\n        ++this.state.pos;\n        out = normalizeCRLF ? \"\\n\" : \"\\r\\n\";\n      } else {\n        out = String.fromCharCode(ch);\n      }\n      ++this.state.curLine;\n      this.state.lineStart = this.state.pos;\n\n      return out;\n    }\n\n    jsxReadString(quote: number): void {\n      let out = \"\";\n      let chunkStart = ++this.state.pos;\n      for (;;) {\n        if (this.state.pos >= this.length) {\n          throw this.raise(this.state.start, Errors.UnterminatedString);\n        }\n\n        const ch = this.input.charCodeAt(this.state.pos);\n        if (ch === quote) break;\n        if (ch === charCodes.ampersand) {\n          out += this.input.slice(chunkStart, this.state.pos);\n          out += this.jsxReadEntity();\n          chunkStart = this.state.pos;\n        } else if (isNewLine(ch)) {\n          out += this.input.slice(chunkStart, this.state.pos);\n          out += this.jsxReadNewLine(false);\n          chunkStart = this.state.pos;\n        } else {\n          ++this.state.pos;\n        }\n      }\n      out += this.input.slice(chunkStart, this.state.pos++);\n      return this.finishToken(tt.string, out);\n    }\n\n    jsxReadEntity(): string {\n      let str = \"\";\n      let count = 0;\n      let entity;\n      let ch = this.input[this.state.pos];\n\n      const startPos = ++this.state.pos;\n      while (this.state.pos < this.length && count++ < 10) {\n        ch = this.input[this.state.pos++];\n        if (ch === \";\") {\n          if (str[0] === \"#\") {\n            if (str[1] === \"x\") {\n              str = str.substr(2);\n              if (HEX_NUMBER.test(str)) {\n                entity = String.fromCodePoint(parseInt(str, 16));\n              }\n            } else {\n              str = str.substr(1);\n              if (DECIMAL_NUMBER.test(str)) {\n                entity = String.fromCodePoint(parseInt(str, 10));\n              }\n            }\n          } else {\n            entity = XHTMLEntities[str];\n          }\n          break;\n        }\n        str += ch;\n      }\n      if (!entity) {\n        this.state.pos = startPos;\n        return \"&\";\n      }\n      return entity;\n    }\n\n    // Read a JSX identifier (valid tag or attribute name).\n    //\n    // Optimized version since JSX identifiers can\"t contain\n    // escape characters and so can be read as single slice.\n    // Also assumes that first character was already checked\n    // by isIdentifierStart in readToken.\n\n    jsxReadWord(): void {\n      let ch;\n      const start = this.state.pos;\n      do {\n        ch = this.input.charCodeAt(++this.state.pos);\n      } while (isIdentifierChar(ch) || ch === charCodes.dash);\n      return this.finishToken(\n        tt.jsxName,\n        this.input.slice(start, this.state.pos),\n      );\n    }\n\n    // Parse next token as JSX identifier\n\n    jsxParseIdentifier(): N.JSXIdentifier {\n      const node = this.startNode();\n      if (this.match(tt.jsxName)) {\n        node.name = this.state.value;\n      } else if (this.state.type.keyword) {\n        node.name = this.state.type.keyword;\n      } else {\n        this.unexpected();\n      }\n      this.next();\n      return this.finishNode(node, \"JSXIdentifier\");\n    }\n\n    // Parse namespaced identifier.\n\n    jsxParseNamespacedName(): N.JSXNamespacedName {\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n      const name = this.jsxParseIdentifier();\n      if (!this.eat(tt.colon)) return name;\n\n      const node = this.startNodeAt(startPos, startLoc);\n      node.namespace = name;\n      node.name = this.jsxParseIdentifier();\n      return this.finishNode(node, \"JSXNamespacedName\");\n    }\n\n    // Parses element name in any form - namespaced, member\n    // or single identifier.\n\n    jsxParseElementName():\n      | N.JSXIdentifier\n      | N.JSXNamespacedName\n      | N.JSXMemberExpression {\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n      let node = this.jsxParseNamespacedName();\n      if (node.type === \"JSXNamespacedName\") {\n        return node;\n      }\n      while (this.eat(tt.dot)) {\n        const newNode = this.startNodeAt(startPos, startLoc);\n        newNode.object = node;\n        newNode.property = this.jsxParseIdentifier();\n        node = this.finishNode(newNode, \"JSXMemberExpression\");\n      }\n      return node;\n    }\n\n    // Parses any type of JSX attribute value.\n\n    jsxParseAttributeValue(): N.Expression {\n      let node;\n      switch (this.state.type) {\n        case tt.braceL:\n          node = this.startNode();\n          this.next();\n          node = this.jsxParseExpressionContainer(node);\n          if (node.expression.type === \"JSXEmptyExpression\") {\n            this.raise(node.start, JsxErrors.AttributeIsEmpty);\n          }\n          return node;\n\n        case tt.jsxTagStart:\n        case tt.string:\n          return this.parseExprAtom();\n\n        default:\n          throw this.raise(this.state.start, JsxErrors.UnsupportedJsxValue);\n      }\n    }\n\n    // JSXEmptyExpression is unique type since it doesn't actually parse anything,\n    // and so it should start at the end of last read token (left brace) and finish\n    // at the beginning of the next one (right brace).\n\n    jsxParseEmptyExpression(): N.JSXEmptyExpression {\n      const node = this.startNodeAt(\n        this.state.lastTokEnd,\n        this.state.lastTokEndLoc,\n      );\n      return this.finishNodeAt(\n        node,\n        \"JSXEmptyExpression\",\n        this.state.start,\n        this.state.startLoc,\n      );\n    }\n\n    // Parse JSX spread child\n\n    jsxParseSpreadChild(node: N.JSXSpreadChild): N.JSXSpreadChild {\n      this.next(); // ellipsis\n      node.expression = this.parseExpression();\n      this.expect(tt.braceR);\n\n      return this.finishNode(node, \"JSXSpreadChild\");\n    }\n\n    // Parses JSX expression enclosed into curly brackets.\n\n    jsxParseExpressionContainer(\n      node: N.JSXExpressionContainer,\n    ): N.JSXExpressionContainer {\n      if (this.match(tt.braceR)) {\n        node.expression = this.jsxParseEmptyExpression();\n      } else {\n        node.expression = this.parseExpression();\n      }\n      this.expect(tt.braceR);\n      return this.finishNode(node, \"JSXExpressionContainer\");\n    }\n\n    // Parses following JSX attribute name-value pair.\n\n    jsxParseAttribute(): N.JSXAttribute {\n      const node = this.startNode();\n      if (this.eat(tt.braceL)) {\n        this.expect(tt.ellipsis);\n        node.argument = this.parseMaybeAssign();\n        this.expect(tt.braceR);\n        return this.finishNode(node, \"JSXSpreadAttribute\");\n      }\n      node.name = this.jsxParseNamespacedName();\n      node.value = this.eat(tt.eq) ? this.jsxParseAttributeValue() : null;\n      return this.finishNode(node, \"JSXAttribute\");\n    }\n\n    // Parses JSX opening tag starting after \"<\".\n\n    jsxParseOpeningElementAt(\n      startPos: number,\n      startLoc: Position,\n    ): N.JSXOpeningElement {\n      const node = this.startNodeAt(startPos, startLoc);\n      if (this.match(tt.jsxTagEnd)) {\n        this.expect(tt.jsxTagEnd);\n        return this.finishNode(node, \"JSXOpeningFragment\");\n      }\n      node.name = this.jsxParseElementName();\n      return this.jsxParseOpeningElementAfterName(node);\n    }\n\n    jsxParseOpeningElementAfterName(\n      node: N.JSXOpeningElement,\n    ): N.JSXOpeningElement {\n      const attributes: N.JSXAttribute[] = [];\n      while (!this.match(tt.slash) && !this.match(tt.jsxTagEnd)) {\n        attributes.push(this.jsxParseAttribute());\n      }\n      node.attributes = attributes;\n      node.selfClosing = this.eat(tt.slash);\n      this.expect(tt.jsxTagEnd);\n      return this.finishNode(node, \"JSXOpeningElement\");\n    }\n\n    // Parses JSX closing tag starting after \"</\".\n\n    jsxParseClosingElementAt(\n      startPos: number,\n      startLoc: Position,\n    ): N.JSXClosingElement {\n      const node = this.startNodeAt(startPos, startLoc);\n      if (this.match(tt.jsxTagEnd)) {\n        this.expect(tt.jsxTagEnd);\n        return this.finishNode(node, \"JSXClosingFragment\");\n      }\n      node.name = this.jsxParseElementName();\n      this.expect(tt.jsxTagEnd);\n      return this.finishNode(node, \"JSXClosingElement\");\n    }\n\n    // Parses entire JSX element, including it\"s opening tag\n    // (starting after \"<\"), attributes, contents and closing tag.\n\n    jsxParseElementAt(startPos: number, startLoc: Position): N.JSXElement {\n      const node = this.startNodeAt(startPos, startLoc);\n      const children = [];\n      const openingElement = this.jsxParseOpeningElementAt(startPos, startLoc);\n      let closingElement = null;\n\n      if (!openingElement.selfClosing) {\n        contents: for (;;) {\n          switch (this.state.type) {\n            case tt.jsxTagStart:\n              startPos = this.state.start;\n              startLoc = this.state.startLoc;\n              this.next();\n              if (this.eat(tt.slash)) {\n                closingElement = this.jsxParseClosingElementAt(\n                  startPos,\n                  startLoc,\n                );\n                break contents;\n              }\n              children.push(this.jsxParseElementAt(startPos, startLoc));\n              break;\n\n            case tt.jsxText:\n              children.push(this.parseExprAtom());\n              break;\n\n            case tt.braceL: {\n              const node = this.startNode();\n              this.next();\n              if (this.match(tt.ellipsis)) {\n                children.push(this.jsxParseSpreadChild(node));\n              } else {\n                children.push(this.jsxParseExpressionContainer(node));\n              }\n\n              break;\n            }\n            // istanbul ignore next - should never happen\n            default:\n              throw this.unexpected();\n          }\n        }\n\n        if (isFragment(openingElement) && !isFragment(closingElement)) {\n          this.raise(\n            // $FlowIgnore\n            closingElement.start,\n            JsxErrors.MissingClosingTagFragment,\n          );\n        } else if (!isFragment(openingElement) && isFragment(closingElement)) {\n          this.raise(\n            // $FlowIgnore\n            closingElement.start,\n            JsxErrors.MissingClosingTagElement,\n            getQualifiedJSXName(openingElement.name),\n          );\n        } else if (!isFragment(openingElement) && !isFragment(closingElement)) {\n          if (\n            // $FlowIgnore\n            getQualifiedJSXName(closingElement.name) !==\n            getQualifiedJSXName(openingElement.name)\n          ) {\n            this.raise(\n              // $FlowIgnore\n              closingElement.start,\n              JsxErrors.MissingClosingTagElement,\n              getQualifiedJSXName(openingElement.name),\n            );\n          }\n        }\n      }\n\n      if (isFragment(openingElement)) {\n        node.openingFragment = openingElement;\n        node.closingFragment = closingElement;\n      } else {\n        node.openingElement = openingElement;\n        node.closingElement = closingElement;\n      }\n      node.children = children;\n      if (this.isRelational(\"<\")) {\n        throw this.raise(\n          this.state.start,\n          JsxErrors.UnwrappedAdjacentJSXElements,\n        );\n      }\n\n      return isFragment(openingElement)\n        ? this.finishNode(node, \"JSXFragment\")\n        : this.finishNode(node, \"JSXElement\");\n    }\n\n    // Parses entire JSX element from current position.\n\n    jsxParseElement(): N.JSXElement {\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n      this.next();\n      return this.jsxParseElementAt(startPos, startLoc);\n    }\n\n    // ==================================\n    // Overrides\n    // ==================================\n\n    parseExprAtom(refExpressionErrors: ?ExpressionErrors): N.Expression {\n      if (this.match(tt.jsxText)) {\n        return this.parseLiteral(this.state.value, \"JSXText\");\n      } else if (this.match(tt.jsxTagStart)) {\n        return this.jsxParseElement();\n      } else if (\n        this.isRelational(\"<\") &&\n        this.input.charCodeAt(this.state.pos) !== charCodes.exclamationMark\n      ) {\n        // In case we encounter an lt token here it will always be the start of\n        // jsx as the lt sign is not allowed in places that expect an expression\n        this.finishToken(tt.jsxTagStart);\n        return this.jsxParseElement();\n      } else {\n        return super.parseExprAtom(refExpressionErrors);\n      }\n    }\n\n    getTokenFromCode(code: number): void {\n      if (this.state.inPropertyName) return super.getTokenFromCode(code);\n\n      const context = this.curContext();\n\n      if (context === tc.j_expr) {\n        return this.jsxReadToken();\n      }\n\n      if (context === tc.j_oTag || context === tc.j_cTag) {\n        if (isIdentifierStart(code)) {\n          return this.jsxReadWord();\n        }\n\n        if (code === charCodes.greaterThan) {\n          ++this.state.pos;\n          return this.finishToken(tt.jsxTagEnd);\n        }\n\n        if (\n          (code === charCodes.quotationMark || code === charCodes.apostrophe) &&\n          context === tc.j_oTag\n        ) {\n          return this.jsxReadString(code);\n        }\n      }\n\n      if (\n        code === charCodes.lessThan &&\n        this.state.exprAllowed &&\n        this.input.charCodeAt(this.state.pos + 1) !== charCodes.exclamationMark\n      ) {\n        ++this.state.pos;\n        return this.finishToken(tt.jsxTagStart);\n      }\n\n      return super.getTokenFromCode(code);\n    }\n\n    updateContext(prevType: TokenType): void {\n      if (this.match(tt.braceL)) {\n        const curContext = this.curContext();\n        if (curContext === tc.j_oTag) {\n          this.state.context.push(tc.braceExpression);\n        } else if (curContext === tc.j_expr) {\n          this.state.context.push(tc.templateQuasi);\n        } else {\n          super.updateContext(prevType);\n        }\n        this.state.exprAllowed = true;\n      } else if (this.match(tt.slash) && prevType === tt.jsxTagStart) {\n        this.state.context.length -= 2; // do not consider JSX expr -> JSX open tag -> ... anymore\n        this.state.context.push(tc.j_cTag); // reconsider as closing tag context\n        this.state.exprAllowed = false;\n      } else {\n        return super.updateContext(prevType);\n      }\n    }\n  };\n","// @flow\nimport {\n  SCOPE_ARROW,\n  SCOPE_DIRECT_SUPER,\n  SCOPE_FUNCTION,\n  SCOPE_SIMPLE_CATCH,\n  SCOPE_SUPER,\n  SCOPE_PROGRAM,\n  SCOPE_VAR,\n  SCOPE_CLASS,\n  BIND_SCOPE_FUNCTION,\n  BIND_SCOPE_VAR,\n  BIND_SCOPE_LEXICAL,\n  BIND_KIND_VALUE,\n  type ScopeFlags,\n  type BindingTypes,\n} from \"./scopeflags\";\nimport * as N from \"../types\";\nimport { Errors } from \"../parser/location\";\n\n// Start an AST node, attaching a start offset.\nexport class Scope {\n  flags: ScopeFlags;\n  // A list of var-declared names in the current lexical scope\n  var: string[] = [];\n  // A list of lexically-declared names in the current lexical scope\n  lexical: string[] = [];\n  // A list of lexically-declared FunctionDeclaration names in the current lexical scope\n  functions: string[] = [];\n\n  constructor(flags: ScopeFlags) {\n    this.flags = flags;\n  }\n}\n\ntype raiseFunction = (number, string, ...any) => void;\n\n// The functions in this module keep track of declared variables in the\n// current scope in order to detect duplicate variable names.\nexport default class ScopeHandler<IScope: Scope = Scope> {\n  scopeStack: Array<IScope> = [];\n  raise: raiseFunction;\n  inModule: boolean;\n  undefinedExports: Map<string, number> = new Map();\n  undefinedPrivateNames: Map<string, number> = new Map();\n\n  constructor(raise: raiseFunction, inModule: boolean) {\n    this.raise = raise;\n    this.inModule = inModule;\n  }\n\n  get inFunction() {\n    return (this.currentVarScope().flags & SCOPE_FUNCTION) > 0;\n  }\n  get allowSuper() {\n    return (this.currentThisScope().flags & SCOPE_SUPER) > 0;\n  }\n  get allowDirectSuper() {\n    return (this.currentThisScope().flags & SCOPE_DIRECT_SUPER) > 0;\n  }\n  get inClass() {\n    return (this.currentThisScope().flags & SCOPE_CLASS) > 0;\n  }\n  get inNonArrowFunction() {\n    return (this.currentThisScope().flags & SCOPE_FUNCTION) > 0;\n  }\n  get treatFunctionsAsVar() {\n    return this.treatFunctionsAsVarInScope(this.currentScope());\n  }\n\n  createScope(flags: ScopeFlags): Scope {\n    return new Scope(flags);\n  }\n  // This method will be overwritten by subclasses\n  /*:: +createScope: (flags: ScopeFlags) => IScope; */\n\n  enter(flags: ScopeFlags) {\n    this.scopeStack.push(this.createScope(flags));\n  }\n\n  exit() {\n    this.scopeStack.pop();\n  }\n\n  // The spec says:\n  // > At the top level of a function, or script, function declarations are\n  // > treated like var declarations rather than like lexical declarations.\n  treatFunctionsAsVarInScope(scope: IScope): boolean {\n    return !!(\n      scope.flags & SCOPE_FUNCTION ||\n      (!this.inModule && scope.flags & SCOPE_PROGRAM)\n    );\n  }\n\n  declareName(name: string, bindingType: BindingTypes, pos: number) {\n    let scope = this.currentScope();\n    if (bindingType & BIND_SCOPE_LEXICAL || bindingType & BIND_SCOPE_FUNCTION) {\n      this.checkRedeclarationInScope(scope, name, bindingType, pos);\n\n      if (bindingType & BIND_SCOPE_FUNCTION) {\n        scope.functions.push(name);\n      } else {\n        scope.lexical.push(name);\n      }\n\n      if (bindingType & BIND_SCOPE_LEXICAL) {\n        this.maybeExportDefined(scope, name);\n      }\n    } else if (bindingType & BIND_SCOPE_VAR) {\n      for (let i = this.scopeStack.length - 1; i >= 0; --i) {\n        scope = this.scopeStack[i];\n        this.checkRedeclarationInScope(scope, name, bindingType, pos);\n        scope.var.push(name);\n        this.maybeExportDefined(scope, name);\n\n        if (scope.flags & SCOPE_VAR) break;\n      }\n    }\n    if (this.inModule && scope.flags & SCOPE_PROGRAM) {\n      this.undefinedExports.delete(name);\n    }\n  }\n\n  maybeExportDefined(scope: IScope, name: string) {\n    if (this.inModule && scope.flags & SCOPE_PROGRAM) {\n      this.undefinedExports.delete(name);\n    }\n  }\n\n  checkRedeclarationInScope(\n    scope: IScope,\n    name: string,\n    bindingType: BindingTypes,\n    pos: number,\n  ) {\n    if (this.isRedeclaredInScope(scope, name, bindingType)) {\n      this.raise(pos, Errors.VarRedeclaration, name);\n    }\n  }\n\n  isRedeclaredInScope(\n    scope: IScope,\n    name: string,\n    bindingType: BindingTypes,\n  ): boolean {\n    if (!(bindingType & BIND_KIND_VALUE)) return false;\n\n    if (bindingType & BIND_SCOPE_LEXICAL) {\n      return (\n        scope.lexical.indexOf(name) > -1 ||\n        scope.functions.indexOf(name) > -1 ||\n        scope.var.indexOf(name) > -1\n      );\n    }\n\n    if (bindingType & BIND_SCOPE_FUNCTION) {\n      return (\n        scope.lexical.indexOf(name) > -1 ||\n        (!this.treatFunctionsAsVarInScope(scope) &&\n          scope.var.indexOf(name) > -1)\n      );\n    }\n\n    return (\n      (scope.lexical.indexOf(name) > -1 &&\n        !(scope.flags & SCOPE_SIMPLE_CATCH && scope.lexical[0] === name)) ||\n      (!this.treatFunctionsAsVarInScope(scope) &&\n        scope.functions.indexOf(name) > -1)\n    );\n  }\n\n  checkLocalExport(id: N.Identifier) {\n    if (\n      this.scopeStack[0].lexical.indexOf(id.name) === -1 &&\n      this.scopeStack[0].var.indexOf(id.name) === -1 &&\n      // In strict mode, scope.functions will always be empty.\n      // Modules are strict by default, but the `scriptMode` option\n      // can overwrite this behavior.\n      this.scopeStack[0].functions.indexOf(id.name) === -1\n    ) {\n      this.undefinedExports.set(id.name, id.start);\n    }\n  }\n\n  currentScope(): IScope {\n    return this.scopeStack[this.scopeStack.length - 1];\n  }\n\n  // $FlowIgnore\n  currentVarScope(): IScope {\n    for (let i = this.scopeStack.length - 1; ; i--) {\n      const scope = this.scopeStack[i];\n      if (scope.flags & SCOPE_VAR) {\n        return scope;\n      }\n    }\n  }\n\n  // Could be useful for `arguments`, `this`, `new.target`, `super()`, `super.property`, and `super[property]`.\n  // $FlowIgnore\n  currentThisScope(): IScope {\n    for (let i = this.scopeStack.length - 1; ; i--) {\n      const scope = this.scopeStack[i];\n      if (\n        (scope.flags & SCOPE_VAR || scope.flags & SCOPE_CLASS) &&\n        !(scope.flags & SCOPE_ARROW)\n      ) {\n        return scope;\n      }\n    }\n  }\n}\n","// @flow\n\nimport ScopeHandler, { Scope } from \"../../util/scope\";\nimport {\n  BIND_KIND_TYPE,\n  BIND_FLAGS_TS_ENUM,\n  BIND_FLAGS_TS_CONST_ENUM,\n  BIND_FLAGS_TS_EXPORT_ONLY,\n  BIND_KIND_VALUE,\n  BIND_FLAGS_CLASS,\n  type ScopeFlags,\n  type BindingTypes,\n} from \"../../util/scopeflags\";\nimport * as N from \"../../types\";\n\nclass TypeScriptScope extends Scope {\n  types: string[] = [];\n\n  // enums (which are also in .types)\n  enums: string[] = [];\n\n  // const enums (which are also in .enums and .types)\n  constEnums: string[] = [];\n\n  // classes (which are also in .lexical) and interface (which are also in .types)\n  classes: string[] = [];\n\n  // namespaces and ambient functions (or classes) are too difficult to track,\n  // especially without type analysis.\n  // We need to track them anyway, to avoid \"X is not defined\" errors\n  // when exporting them.\n  exportOnlyBindings: string[] = [];\n}\n\n// See https://github.com/babel/babel/pull/9766#discussion_r268920730 for an\n// explanation of how typescript handles scope.\n\nexport default class TypeScriptScopeHandler extends ScopeHandler<TypeScriptScope> {\n  createScope(flags: ScopeFlags): TypeScriptScope {\n    return new TypeScriptScope(flags);\n  }\n\n  declareName(name: string, bindingType: BindingTypes, pos: number) {\n    const scope = this.currentScope();\n    if (bindingType & BIND_FLAGS_TS_EXPORT_ONLY) {\n      this.maybeExportDefined(scope, name);\n      scope.exportOnlyBindings.push(name);\n      return;\n    }\n\n    super.declareName(...arguments);\n\n    if (bindingType & BIND_KIND_TYPE) {\n      if (!(bindingType & BIND_KIND_VALUE)) {\n        // \"Value\" bindings have already been registered by the superclass.\n        this.checkRedeclarationInScope(scope, name, bindingType, pos);\n        this.maybeExportDefined(scope, name);\n      }\n      scope.types.push(name);\n    }\n    if (bindingType & BIND_FLAGS_TS_ENUM) scope.enums.push(name);\n    if (bindingType & BIND_FLAGS_TS_CONST_ENUM) scope.constEnums.push(name);\n    if (bindingType & BIND_FLAGS_CLASS) scope.classes.push(name);\n  }\n\n  isRedeclaredInScope(\n    scope: TypeScriptScope,\n    name: string,\n    bindingType: BindingTypes,\n  ): boolean {\n    if (scope.enums.indexOf(name) > -1) {\n      if (bindingType & BIND_FLAGS_TS_ENUM) {\n        // Enums can be merged with other enums if they are both\n        //  const or both non-const.\n        const isConst = !!(bindingType & BIND_FLAGS_TS_CONST_ENUM);\n        const wasConst = scope.constEnums.indexOf(name) > -1;\n        return isConst !== wasConst;\n      }\n      return true;\n    }\n    if (bindingType & BIND_FLAGS_CLASS && scope.classes.indexOf(name) > -1) {\n      if (scope.lexical.indexOf(name) > -1) {\n        // Classes can be merged with interfaces\n        return !!(bindingType & BIND_KIND_VALUE);\n      } else {\n        // Interface can be merged with other classes or interfaces\n        return false;\n      }\n    }\n    if (bindingType & BIND_KIND_TYPE && scope.types.indexOf(name) > -1) {\n      return true;\n    }\n\n    return super.isRedeclaredInScope(...arguments);\n  }\n\n  checkLocalExport(id: N.Identifier) {\n    if (\n      this.scopeStack[0].types.indexOf(id.name) === -1 &&\n      this.scopeStack[0].exportOnlyBindings.indexOf(id.name) === -1\n    ) {\n      super.checkLocalExport(id);\n    }\n  }\n}\n","// @flow\nexport const PARAM = 0b000, // Initial Parameter flags\n  PARAM_YIELD = 0b001, // track [Yield] production parameter\n  PARAM_AWAIT = 0b010, // track [Await] production parameter\n  PARAM_RETURN = 0b100; // track [Return] production parameter\n\n// ProductionParameterHandler is a stack fashioned production parameter tracker\n// https://tc39.es/ecma262/#sec-grammar-notation\n// The tracked parameters are defined above. Note that the [In] parameter is\n// tracked in `noIn` argument of `parseExpression`.\n//\n// Whenever [+Await]/[+Yield] appears in the right-hand sides of a production,\n// we must enter a new tracking stack. For example when parsing\n//\n// AsyncFunctionDeclaration [Yield, Await]:\n//   async [no LineTerminator here] function BindingIdentifier[?Yield, ?Await]\n//     ( FormalParameters[~Yield, +Await] ) { AsyncFunctionBody }\n//\n// we must follow such process:\n//\n// 1. parse async keyword\n// 2. parse function keyword\n// 3. parse bindingIdentifier <= inherit current parameters: [?Await]\n// 4. enter new stack with (PARAM_AWAIT)\n// 5. parse formal parameters <= must have [Await] parameter [+Await]\n// 6. parse function body\n// 7. exit current stack\n\nexport type ParamKind = typeof PARAM | typeof PARAM_AWAIT | typeof PARAM_YIELD;\n\nexport default class ProductionParameterHandler {\n  stacks: Array<ParamKind> = [];\n  enter(flags: ParamKind) {\n    this.stacks.push(flags);\n  }\n\n  exit() {\n    this.stacks.pop();\n  }\n\n  currentFlags(): ParamKind {\n    return this.stacks[this.stacks.length - 1];\n  }\n\n  get hasAwait(): boolean {\n    return (this.currentFlags() & PARAM_AWAIT) > 0;\n  }\n\n  get hasYield(): boolean {\n    return (this.currentFlags() & PARAM_YIELD) > 0;\n  }\n\n  get hasReturn(): boolean {\n    return (this.currentFlags() & PARAM_RETURN) > 0;\n  }\n}\n\nexport function functionFlags(\n  isAsync: boolean,\n  isGenerator: boolean,\n): ParamKind {\n  return (isAsync ? PARAM_AWAIT : 0) | (isGenerator ? PARAM_YIELD : 0);\n}\n","// @flow\n\n/*:: declare var invariant; */\n\nimport type { TokenType } from \"../../tokenizer/types\";\nimport type State from \"../../tokenizer/state\";\nimport { types as tt } from \"../../tokenizer/types\";\nimport { types as ct } from \"../../tokenizer/context\";\nimport * as N from \"../../types\";\nimport type { Pos, Position } from \"../../util/location\";\nimport type Parser from \"../../parser\";\nimport {\n  type BindingTypes,\n  BIND_NONE,\n  SCOPE_TS_MODULE,\n  SCOPE_OTHER,\n  BIND_TS_ENUM,\n  BIND_TS_CONST_ENUM,\n  BIND_TS_TYPE,\n  BIND_TS_INTERFACE,\n  BIND_TS_AMBIENT,\n  BIND_TS_NAMESPACE,\n  BIND_CLASS,\n  BIND_LEXICAL,\n} from \"../../util/scopeflags\";\nimport TypeScriptScopeHandler from \"./scope\";\nimport * as charCodes from \"charcodes\";\nimport type { ExpressionErrors } from \"../../parser/util\";\nimport { PARAM } from \"../../util/production-parameter\";\nimport { Errors } from \"../../parser/location\";\n\ntype TsModifier =\n  | \"readonly\"\n  | \"abstract\"\n  | \"declare\"\n  | \"static\"\n  | \"public\"\n  | \"private\"\n  | \"protected\";\n\nfunction nonNull<T>(x: ?T): T {\n  if (x == null) {\n    // $FlowIgnore\n    throw new Error(`Unexpected ${x} value.`);\n  }\n  return x;\n}\n\nfunction assert(x: boolean): void {\n  if (!x) {\n    throw new Error(\"Assert fail\");\n  }\n}\n\ntype ParsingContext =\n  | \"EnumMembers\"\n  | \"HeritageClauseElement\"\n  | \"TupleElementTypes\"\n  | \"TypeMembers\"\n  | \"TypeParametersOrArguments\";\n\nconst TSErrors = Object.freeze({\n  ClassMethodHasDeclare: \"Class methods cannot have the 'declare' modifier\",\n  ClassMethodHasReadonly: \"Class methods cannot have the 'readonly' modifier\",\n  DeclareClassFieldHasInitializer:\n    \"'declare' class fields cannot have an initializer\",\n  DuplicateModifier: \"Duplicate modifier: '%0'\",\n  EmptyHeritageClauseType: \"'%0' list cannot be empty.\",\n  IndexSignatureHasAbstract:\n    \"Index signatures cannot have the 'abstract' modifier\",\n  IndexSignatureHasAccessibility:\n    \"Index signatures cannot have an accessibility modifier ('%0')\",\n  IndexSignatureHasStatic: \"Index signatures cannot have the 'static' modifier\",\n  OptionalTypeBeforeRequired:\n    \"A required element cannot follow an optional element.\",\n  PatternIsOptional:\n    \"A binding pattern parameter cannot be optional in an implementation signature.\",\n  PrivateElementHasAbstract:\n    \"Private elements cannot have the 'abstract' modifier.\",\n  PrivateElementHasAccessibility:\n    \"Private elements cannot have an accessibility modifier ('%0')\",\n  TemplateTypeHasSubstitution:\n    \"Template literal types cannot have any substitution\",\n  TypeAnnotationAfterAssign:\n    \"Type annotations must come before default assignments, e.g. instead of `age = 25: number` use `age: number = 25`\",\n  UnexpectedReadonly:\n    \"'readonly' type modifier is only permitted on array and tuple literal types.\",\n  UnexpectedTypeAnnotation: \"Did not expect a type annotation here.\",\n  UnexpectedTypeCastInParameter: \"Unexpected type cast in parameter position.\",\n  UnsupportedImportTypeArgument:\n    \"Argument in a type import must be a string literal\",\n  UnsupportedParameterPropertyKind:\n    \"A parameter property may not be declared using a binding pattern.\",\n  UnsupportedSignatureParameterKind:\n    \"Name in a signature must be an Identifier, ObjectPattern or ArrayPattern, instead got %0\",\n});\n\n// Doesn't handle \"void\" or \"null\" because those are keywords, not identifiers.\nfunction keywordTypeFromName(\n  value: string,\n): N.TsKeywordTypeType | typeof undefined {\n  switch (value) {\n    case \"any\":\n      return \"TSAnyKeyword\";\n    case \"boolean\":\n      return \"TSBooleanKeyword\";\n    case \"bigint\":\n      return \"TSBigIntKeyword\";\n    case \"never\":\n      return \"TSNeverKeyword\";\n    case \"number\":\n      return \"TSNumberKeyword\";\n    case \"object\":\n      return \"TSObjectKeyword\";\n    case \"string\":\n      return \"TSStringKeyword\";\n    case \"symbol\":\n      return \"TSSymbolKeyword\";\n    case \"undefined\":\n      return \"TSUndefinedKeyword\";\n    case \"unknown\":\n      return \"TSUnknownKeyword\";\n    default:\n      return undefined;\n  }\n}\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    getScopeHandler(): Class<TypeScriptScopeHandler> {\n      return TypeScriptScopeHandler;\n    }\n\n    tsIsIdentifier(): boolean {\n      // TODO: actually a bit more complex in TypeScript, but shouldn't matter.\n      // See https://github.com/Microsoft/TypeScript/issues/15008\n      return this.match(tt.name);\n    }\n\n    tsNextTokenCanFollowModifier() {\n      // Note: TypeScript's implementation is much more complicated because\n      // more things are considered modifiers there.\n      // This implementation only handles modifiers not handled by @babel/parser itself. And \"static\".\n      // TODO: Would be nice to avoid lookahead. Want a hasLineBreakUpNext() method...\n      this.next();\n      return (\n        !this.hasPrecedingLineBreak() &&\n        !this.match(tt.parenL) &&\n        !this.match(tt.parenR) &&\n        !this.match(tt.colon) &&\n        !this.match(tt.eq) &&\n        !this.match(tt.question) &&\n        !this.match(tt.bang)\n      );\n    }\n\n    /** Parses a modifier matching one the given modifier names. */\n    tsParseModifier<T: TsModifier>(allowedModifiers: T[]): ?T {\n      if (!this.match(tt.name)) {\n        return undefined;\n      }\n\n      const modifier = this.state.value;\n      if (\n        allowedModifiers.indexOf(modifier) !== -1 &&\n        this.tsTryParse(this.tsNextTokenCanFollowModifier.bind(this))\n      ) {\n        return modifier;\n      }\n      return undefined;\n    }\n\n    /** Parses a list of modifiers, in any order.\n     *  If you need a specific order, you must call this function multiple times:\n     *    this.tsParseModifiers(node, [\"public\"]);\n     *    this.tsParseModifiers(node, [\"abstract\", \"readonly\"]);\n     */\n    tsParseModifiers<T: TsModifier>(\n      modified: { [key: TsModifier]: ?true },\n      allowedModifiers: T[],\n    ): void {\n      for (;;) {\n        const startPos = this.state.start;\n        const modifier: ?T = this.tsParseModifier(allowedModifiers);\n\n        if (!modifier) break;\n\n        if (Object.hasOwnProperty.call(modified, modifier)) {\n          this.raise(startPos, TSErrors.DuplicateModifier, modifier);\n        }\n        modified[modifier] = true;\n      }\n    }\n\n    tsIsListTerminator(kind: ParsingContext): boolean {\n      switch (kind) {\n        case \"EnumMembers\":\n        case \"TypeMembers\":\n          return this.match(tt.braceR);\n        case \"HeritageClauseElement\":\n          return this.match(tt.braceL);\n        case \"TupleElementTypes\":\n          return this.match(tt.bracketR);\n        case \"TypeParametersOrArguments\":\n          return this.isRelational(\">\");\n      }\n\n      throw new Error(\"Unreachable\");\n    }\n\n    tsParseList<T: N.Node>(kind: ParsingContext, parseElement: () => T): T[] {\n      const result: T[] = [];\n      while (!this.tsIsListTerminator(kind)) {\n        // Skipping \"parseListElement\" from the TS source since that's just for error handling.\n        result.push(parseElement());\n      }\n      return result;\n    }\n\n    tsParseDelimitedList<T: N.Node>(\n      kind: ParsingContext,\n      parseElement: () => T,\n    ): T[] {\n      return nonNull(\n        this.tsParseDelimitedListWorker(\n          kind,\n          parseElement,\n          /* expectSuccess */ true,\n        ),\n      );\n    }\n\n    /**\n     * If !expectSuccess, returns undefined instead of failing to parse.\n     * If expectSuccess, parseElement should always return a defined value.\n     */\n    tsParseDelimitedListWorker<T: N.Node>(\n      kind: ParsingContext,\n      parseElement: () => ?T,\n      expectSuccess: boolean,\n    ): ?(T[]) {\n      const result = [];\n\n      for (;;) {\n        if (this.tsIsListTerminator(kind)) {\n          break;\n        }\n\n        const element = parseElement();\n        if (element == null) {\n          return undefined;\n        }\n        result.push(element);\n\n        if (this.eat(tt.comma)) {\n          continue;\n        }\n\n        if (this.tsIsListTerminator(kind)) {\n          break;\n        }\n\n        if (expectSuccess) {\n          // This will fail with an error about a missing comma\n          this.expect(tt.comma);\n        }\n        return undefined;\n      }\n\n      return result;\n    }\n\n    tsParseBracketedList<T: N.Node>(\n      kind: ParsingContext,\n      parseElement: () => T,\n      bracket: boolean,\n      skipFirstToken: boolean,\n    ): T[] {\n      if (!skipFirstToken) {\n        if (bracket) {\n          this.expect(tt.bracketL);\n        } else {\n          this.expectRelational(\"<\");\n        }\n      }\n\n      const result = this.tsParseDelimitedList(kind, parseElement);\n\n      if (bracket) {\n        this.expect(tt.bracketR);\n      } else {\n        this.expectRelational(\">\");\n      }\n\n      return result;\n    }\n\n    tsParseImportType(): N.TsImportType {\n      const node: N.TsImportType = this.startNode();\n      this.expect(tt._import);\n      this.expect(tt.parenL);\n      if (!this.match(tt.string)) {\n        this.raise(this.state.start, TSErrors.UnsupportedImportTypeArgument);\n      }\n\n      // For compatibility to estree we cannot call parseLiteral directly here\n      node.argument = this.parseExprAtom();\n      this.expect(tt.parenR);\n\n      if (this.eat(tt.dot)) {\n        node.qualifier = this.tsParseEntityName(/* allowReservedWords */ true);\n      }\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.tsParseTypeArguments();\n      }\n      return this.finishNode(node, \"TSImportType\");\n    }\n\n    tsParseEntityName(allowReservedWords: boolean): N.TsEntityName {\n      let entity: N.TsEntityName = this.parseIdentifier();\n      while (this.eat(tt.dot)) {\n        const node: N.TsQualifiedName = this.startNodeAtNode(entity);\n        node.left = entity;\n        node.right = this.parseIdentifier(allowReservedWords);\n        entity = this.finishNode(node, \"TSQualifiedName\");\n      }\n      return entity;\n    }\n\n    tsParseTypeReference(): N.TsTypeReference {\n      const node: N.TsTypeReference = this.startNode();\n      node.typeName = this.tsParseEntityName(/* allowReservedWords */ false);\n      if (!this.hasPrecedingLineBreak() && this.isRelational(\"<\")) {\n        node.typeParameters = this.tsParseTypeArguments();\n      }\n      return this.finishNode(node, \"TSTypeReference\");\n    }\n\n    tsParseThisTypePredicate(lhs: N.TsThisType): N.TsTypePredicate {\n      this.next();\n      const node: N.TsTypePredicate = this.startNodeAtNode(lhs);\n      node.parameterName = lhs;\n      node.typeAnnotation = this.tsParseTypeAnnotation(/* eatColon */ false);\n      return this.finishNode(node, \"TSTypePredicate\");\n    }\n\n    tsParseThisTypeNode(): N.TsThisType {\n      const node: N.TsThisType = this.startNode();\n      this.next();\n      return this.finishNode(node, \"TSThisType\");\n    }\n\n    tsParseTypeQuery(): N.TsTypeQuery {\n      const node: N.TsTypeQuery = this.startNode();\n      this.expect(tt._typeof);\n      if (this.match(tt._import)) {\n        node.exprName = this.tsParseImportType();\n      } else {\n        node.exprName = this.tsParseEntityName(/* allowReservedWords */ true);\n      }\n      return this.finishNode(node, \"TSTypeQuery\");\n    }\n\n    tsParseTypeParameter(): N.TsTypeParameter {\n      const node: N.TsTypeParameter = this.startNode();\n      node.name = this.parseIdentifierName(node.start);\n      node.constraint = this.tsEatThenParseType(tt._extends);\n      node.default = this.tsEatThenParseType(tt.eq);\n      return this.finishNode(node, \"TSTypeParameter\");\n    }\n\n    tsTryParseTypeParameters(): ?N.TsTypeParameterDeclaration {\n      if (this.isRelational(\"<\")) {\n        return this.tsParseTypeParameters();\n      }\n    }\n\n    tsParseTypeParameters() {\n      const node: N.TsTypeParameterDeclaration = this.startNode();\n\n      if (this.isRelational(\"<\") || this.match(tt.jsxTagStart)) {\n        this.next();\n      } else {\n        this.unexpected();\n      }\n\n      node.params = this.tsParseBracketedList(\n        \"TypeParametersOrArguments\",\n        this.tsParseTypeParameter.bind(this),\n        /* bracket */ false,\n        /* skipFirstToken */ true,\n      );\n      return this.finishNode(node, \"TSTypeParameterDeclaration\");\n    }\n\n    tsTryNextParseConstantContext(): ?N.TsTypeReference {\n      if (this.lookahead().type === tt._const) {\n        this.next();\n        return this.tsParseTypeReference();\n      }\n      return null;\n    }\n\n    // Note: In TypeScript implementation we must provide `yieldContext` and `awaitContext`,\n    // but here it's always false, because this is only used for types.\n    tsFillSignature(\n      returnToken: TokenType,\n      signature: N.TsSignatureDeclaration,\n    ): void {\n      // Arrow fns *must* have return token (`=>`). Normal functions can omit it.\n      const returnTokenRequired = returnToken === tt.arrow;\n      signature.typeParameters = this.tsTryParseTypeParameters();\n      this.expect(tt.parenL);\n      signature.parameters = this.tsParseBindingListForSignature();\n      if (returnTokenRequired) {\n        signature.typeAnnotation = this.tsParseTypeOrTypePredicateAnnotation(\n          returnToken,\n        );\n      } else if (this.match(returnToken)) {\n        signature.typeAnnotation = this.tsParseTypeOrTypePredicateAnnotation(\n          returnToken,\n        );\n      }\n    }\n\n    tsParseBindingListForSignature(): $ReadOnlyArray<\n      N.Identifier | N.RestElement | N.ObjectPattern | N.ArrayPattern,\n    > {\n      return this.parseBindingList(tt.parenR, charCodes.rightParenthesis).map(\n        pattern => {\n          if (\n            pattern.type !== \"Identifier\" &&\n            pattern.type !== \"RestElement\" &&\n            pattern.type !== \"ObjectPattern\" &&\n            pattern.type !== \"ArrayPattern\"\n          ) {\n            this.raise(\n              pattern.start,\n              TSErrors.UnsupportedSignatureParameterKind,\n              pattern.type,\n            );\n          }\n          return (pattern: any);\n        },\n      );\n    }\n\n    tsParseTypeMemberSemicolon(): void {\n      if (!this.eat(tt.comma)) {\n        this.semicolon();\n      }\n    }\n\n    tsParseSignatureMember(\n      kind: \"TSCallSignatureDeclaration\" | \"TSConstructSignatureDeclaration\",\n      node: N.TsCallSignatureDeclaration | N.TsConstructSignatureDeclaration,\n    ): N.TsCallSignatureDeclaration | N.TsConstructSignatureDeclaration {\n      this.tsFillSignature(tt.colon, node);\n      this.tsParseTypeMemberSemicolon();\n      return this.finishNode(node, kind);\n    }\n\n    tsIsUnambiguouslyIndexSignature() {\n      this.next(); // Skip '{'\n      return this.eat(tt.name) && this.match(tt.colon);\n    }\n\n    tsTryParseIndexSignature(node: N.Node): ?N.TsIndexSignature {\n      if (\n        !(\n          this.match(tt.bracketL) &&\n          this.tsLookAhead(this.tsIsUnambiguouslyIndexSignature.bind(this))\n        )\n      ) {\n        return undefined;\n      }\n\n      this.expect(tt.bracketL);\n      const id = this.parseIdentifier();\n      id.typeAnnotation = this.tsParseTypeAnnotation();\n      this.resetEndLocation(id); // set end position to end of type\n\n      this.expect(tt.bracketR);\n      node.parameters = [id];\n\n      const type = this.tsTryParseTypeAnnotation();\n      if (type) node.typeAnnotation = type;\n      this.tsParseTypeMemberSemicolon();\n      return this.finishNode(node, \"TSIndexSignature\");\n    }\n\n    tsParsePropertyOrMethodSignature(\n      node: N.TsPropertySignature | N.TsMethodSignature,\n      readonly: boolean,\n    ): N.TsPropertySignature | N.TsMethodSignature {\n      if (this.eat(tt.question)) node.optional = true;\n      const nodeAny: any = node;\n\n      if (!readonly && (this.match(tt.parenL) || this.isRelational(\"<\"))) {\n        const method: N.TsMethodSignature = nodeAny;\n        this.tsFillSignature(tt.colon, method);\n        this.tsParseTypeMemberSemicolon();\n        return this.finishNode(method, \"TSMethodSignature\");\n      } else {\n        const property: N.TsPropertySignature = nodeAny;\n        if (readonly) property.readonly = true;\n        const type = this.tsTryParseTypeAnnotation();\n        if (type) property.typeAnnotation = type;\n        this.tsParseTypeMemberSemicolon();\n        return this.finishNode(property, \"TSPropertySignature\");\n      }\n    }\n\n    tsParseTypeMember(): N.TsTypeElement {\n      const node: any = this.startNode();\n\n      if (this.match(tt.parenL) || this.isRelational(\"<\")) {\n        return this.tsParseSignatureMember(\"TSCallSignatureDeclaration\", node);\n      }\n\n      if (this.match(tt._new)) {\n        const id: N.Identifier = this.startNode();\n        this.next();\n        if (this.match(tt.parenL) || this.isRelational(\"<\")) {\n          return this.tsParseSignatureMember(\n            \"TSConstructSignatureDeclaration\",\n            node,\n          );\n        } else {\n          node.key = this.createIdentifier(id, \"new\");\n          return this.tsParsePropertyOrMethodSignature(node, false);\n        }\n      }\n\n      const readonly = !!this.tsParseModifier([\"readonly\"]);\n\n      const idx = this.tsTryParseIndexSignature(node);\n      if (idx) {\n        if (readonly) node.readonly = true;\n        return idx;\n      }\n\n      this.parsePropertyName(node, /* isPrivateNameAllowed */ false);\n      return this.tsParsePropertyOrMethodSignature(node, readonly);\n    }\n\n    tsParseTypeLiteral(): N.TsTypeLiteral {\n      const node: N.TsTypeLiteral = this.startNode();\n      node.members = this.tsParseObjectTypeMembers();\n      return this.finishNode(node, \"TSTypeLiteral\");\n    }\n\n    tsParseObjectTypeMembers(): $ReadOnlyArray<N.TsTypeElement> {\n      this.expect(tt.braceL);\n      const members = this.tsParseList(\n        \"TypeMembers\",\n        this.tsParseTypeMember.bind(this),\n      );\n      this.expect(tt.braceR);\n      return members;\n    }\n\n    tsIsStartOfMappedType(): boolean {\n      this.next();\n      if (this.eat(tt.plusMin)) {\n        return this.isContextual(\"readonly\");\n      }\n      if (this.isContextual(\"readonly\")) {\n        this.next();\n      }\n      if (!this.match(tt.bracketL)) {\n        return false;\n      }\n      this.next();\n      if (!this.tsIsIdentifier()) {\n        return false;\n      }\n      this.next();\n      return this.match(tt._in);\n    }\n\n    tsParseMappedTypeParameter(): N.TsTypeParameter {\n      const node: N.TsTypeParameter = this.startNode();\n      node.name = this.parseIdentifierName(node.start);\n      node.constraint = this.tsExpectThenParseType(tt._in);\n      return this.finishNode(node, \"TSTypeParameter\");\n    }\n\n    tsParseMappedType(): N.TsMappedType {\n      const node: N.TsMappedType = this.startNode();\n\n      this.expect(tt.braceL);\n\n      if (this.match(tt.plusMin)) {\n        node.readonly = this.state.value;\n        this.next();\n        this.expectContextual(\"readonly\");\n      } else if (this.eatContextual(\"readonly\")) {\n        node.readonly = true;\n      }\n\n      this.expect(tt.bracketL);\n      node.typeParameter = this.tsParseMappedTypeParameter();\n      this.expect(tt.bracketR);\n\n      if (this.match(tt.plusMin)) {\n        node.optional = this.state.value;\n        this.next();\n        this.expect(tt.question);\n      } else if (this.eat(tt.question)) {\n        node.optional = true;\n      }\n\n      node.typeAnnotation = this.tsTryParseType();\n      this.semicolon();\n      this.expect(tt.braceR);\n\n      return this.finishNode(node, \"TSMappedType\");\n    }\n\n    tsParseTupleType(): N.TsTupleType {\n      const node: N.TsTupleType = this.startNode();\n      node.elementTypes = this.tsParseBracketedList(\n        \"TupleElementTypes\",\n        this.tsParseTupleElementType.bind(this),\n        /* bracket */ true,\n        /* skipFirstToken */ false,\n      );\n\n      // Validate the elementTypes to ensure:\n      //   No mandatory elements may follow optional elements\n      //   If there's a rest element, it must be at the end of the tuple\n      let seenOptionalElement = false;\n      node.elementTypes.forEach(elementNode => {\n        if (elementNode.type === \"TSOptionalType\") {\n          seenOptionalElement = true;\n        } else if (seenOptionalElement && elementNode.type !== \"TSRestType\") {\n          this.raise(elementNode.start, TSErrors.OptionalTypeBeforeRequired);\n        }\n      });\n\n      return this.finishNode(node, \"TSTupleType\");\n    }\n\n    tsParseTupleElementType(): N.TsType {\n      // parses `...TsType[]`\n      if (this.match(tt.ellipsis)) {\n        const restNode: N.TsRestType = this.startNode();\n        this.next(); // skips ellipsis\n        restNode.typeAnnotation = this.tsParseType();\n        if (\n          this.match(tt.comma) &&\n          this.lookaheadCharCode() !== charCodes.rightSquareBracket\n        ) {\n          this.raiseRestNotLast(this.state.start);\n        }\n        return this.finishNode(restNode, \"TSRestType\");\n      }\n\n      const type = this.tsParseType();\n      // parses `TsType?`\n      if (this.eat(tt.question)) {\n        const optionalTypeNode: N.TsOptionalType = this.startNodeAtNode(type);\n        optionalTypeNode.typeAnnotation = type;\n        return this.finishNode(optionalTypeNode, \"TSOptionalType\");\n      }\n      return type;\n    }\n\n    tsParseParenthesizedType(): N.TsParenthesizedType {\n      const node = this.startNode();\n      this.expect(tt.parenL);\n      node.typeAnnotation = this.tsParseType();\n      this.expect(tt.parenR);\n      return this.finishNode(node, \"TSParenthesizedType\");\n    }\n\n    tsParseFunctionOrConstructorType(\n      type: \"TSFunctionType\" | \"TSConstructorType\",\n    ): N.TsFunctionOrConstructorType {\n      const node: N.TsFunctionOrConstructorType = this.startNode();\n      if (type === \"TSConstructorType\") {\n        this.expect(tt._new);\n      }\n      this.tsFillSignature(tt.arrow, node);\n      return this.finishNode(node, type);\n    }\n\n    tsParseLiteralTypeNode(): N.TsLiteralType {\n      const node: N.TsLiteralType = this.startNode();\n      node.literal = (() => {\n        switch (this.state.type) {\n          case tt.num:\n          case tt.string:\n          case tt._true:\n          case tt._false:\n            // For compatibility to estree we cannot call parseLiteral directly here\n            return this.parseExprAtom();\n          default:\n            throw this.unexpected();\n        }\n      })();\n      return this.finishNode(node, \"TSLiteralType\");\n    }\n\n    tsParseTemplateLiteralType(): N.TsType {\n      const node: N.TsLiteralType = this.startNode();\n      const templateNode = this.parseTemplate(false);\n      if (templateNode.expressions.length > 0) {\n        this.raise(\n          templateNode.expressions[0].start,\n          TSErrors.TemplateTypeHasSubstitution,\n        );\n      }\n      node.literal = templateNode;\n      return this.finishNode(node, \"TSLiteralType\");\n    }\n\n    tsParseThisTypeOrThisTypePredicate(): N.TsThisType | N.TsTypePredicate {\n      const thisKeyword = this.tsParseThisTypeNode();\n      if (this.isContextual(\"is\") && !this.hasPrecedingLineBreak()) {\n        return this.tsParseThisTypePredicate(thisKeyword);\n      } else {\n        return thisKeyword;\n      }\n    }\n\n    tsParseNonArrayType(): N.TsType {\n      switch (this.state.type) {\n        case tt.name:\n        case tt._void:\n        case tt._null: {\n          const type = this.match(tt._void)\n            ? \"TSVoidKeyword\"\n            : this.match(tt._null)\n            ? \"TSNullKeyword\"\n            : keywordTypeFromName(this.state.value);\n          if (\n            type !== undefined &&\n            this.lookaheadCharCode() !== charCodes.dot\n          ) {\n            const node: N.TsKeywordType = this.startNode();\n            this.next();\n            return this.finishNode(node, type);\n          }\n          return this.tsParseTypeReference();\n        }\n        case tt.string:\n        case tt.num:\n        case tt._true:\n        case tt._false:\n          return this.tsParseLiteralTypeNode();\n        case tt.plusMin:\n          if (this.state.value === \"-\") {\n            const node: N.TsLiteralType = this.startNode();\n            if (this.lookahead().type !== tt.num) {\n              throw this.unexpected();\n            }\n            node.literal = this.parseMaybeUnary();\n            return this.finishNode(node, \"TSLiteralType\");\n          }\n          break;\n        case tt._this:\n          return this.tsParseThisTypeOrThisTypePredicate();\n        case tt._typeof:\n          return this.tsParseTypeQuery();\n        case tt._import:\n          return this.tsParseImportType();\n        case tt.braceL:\n          return this.tsLookAhead(this.tsIsStartOfMappedType.bind(this))\n            ? this.tsParseMappedType()\n            : this.tsParseTypeLiteral();\n        case tt.bracketL:\n          return this.tsParseTupleType();\n        case tt.parenL:\n          return this.tsParseParenthesizedType();\n        case tt.backQuote:\n          return this.tsParseTemplateLiteralType();\n      }\n\n      throw this.unexpected();\n    }\n\n    tsParseArrayTypeOrHigher(): N.TsType {\n      let type = this.tsParseNonArrayType();\n      while (!this.hasPrecedingLineBreak() && this.eat(tt.bracketL)) {\n        if (this.match(tt.bracketR)) {\n          const node: N.TsArrayType = this.startNodeAtNode(type);\n          node.elementType = type;\n          this.expect(tt.bracketR);\n          type = this.finishNode(node, \"TSArrayType\");\n        } else {\n          const node: N.TsIndexedAccessType = this.startNodeAtNode(type);\n          node.objectType = type;\n          node.indexType = this.tsParseType();\n          this.expect(tt.bracketR);\n          type = this.finishNode(node, \"TSIndexedAccessType\");\n        }\n      }\n      return type;\n    }\n\n    tsParseTypeOperator(\n      operator: \"keyof\" | \"unique\" | \"readonly\",\n    ): N.TsTypeOperator {\n      const node: N.TsTypeOperator = this.startNode();\n      this.expectContextual(operator);\n      node.operator = operator;\n      node.typeAnnotation = this.tsParseTypeOperatorOrHigher();\n\n      if (operator === \"readonly\") {\n        this.tsCheckTypeAnnotationForReadOnly(node);\n      }\n\n      return this.finishNode(node, \"TSTypeOperator\");\n    }\n\n    tsCheckTypeAnnotationForReadOnly(node: N.Node) {\n      switch (node.typeAnnotation.type) {\n        case \"TSTupleType\":\n        case \"TSArrayType\":\n          return;\n        default:\n          this.raise(node.start, TSErrors.UnexpectedReadonly);\n      }\n    }\n\n    tsParseInferType(): N.TsInferType {\n      const node = this.startNode();\n      this.expectContextual(\"infer\");\n      const typeParameter = this.startNode();\n      typeParameter.name = this.parseIdentifierName(typeParameter.start);\n      node.typeParameter = this.finishNode(typeParameter, \"TSTypeParameter\");\n      return this.finishNode(node, \"TSInferType\");\n    }\n\n    tsParseTypeOperatorOrHigher(): N.TsType {\n      const operator = [\"keyof\", \"unique\", \"readonly\"].find(kw =>\n        this.isContextual(kw),\n      );\n      return operator\n        ? this.tsParseTypeOperator(operator)\n        : this.isContextual(\"infer\")\n        ? this.tsParseInferType()\n        : this.tsParseArrayTypeOrHigher();\n    }\n\n    tsParseUnionOrIntersectionType(\n      kind: \"TSUnionType\" | \"TSIntersectionType\",\n      parseConstituentType: () => N.TsType,\n      operator: TokenType,\n    ): N.TsType {\n      this.eat(operator);\n      let type = parseConstituentType();\n      if (this.match(operator)) {\n        const types = [type];\n        while (this.eat(operator)) {\n          types.push(parseConstituentType());\n        }\n        const node: N.TsUnionType | N.TsIntersectionType = this.startNodeAtNode(\n          type,\n        );\n        node.types = types;\n        type = this.finishNode(node, kind);\n      }\n      return type;\n    }\n\n    tsParseIntersectionTypeOrHigher(): N.TsType {\n      return this.tsParseUnionOrIntersectionType(\n        \"TSIntersectionType\",\n        this.tsParseTypeOperatorOrHigher.bind(this),\n        tt.bitwiseAND,\n      );\n    }\n\n    tsParseUnionTypeOrHigher() {\n      return this.tsParseUnionOrIntersectionType(\n        \"TSUnionType\",\n        this.tsParseIntersectionTypeOrHigher.bind(this),\n        tt.bitwiseOR,\n      );\n    }\n\n    tsIsStartOfFunctionType() {\n      if (this.isRelational(\"<\")) {\n        return true;\n      }\n      return (\n        this.match(tt.parenL) &&\n        this.tsLookAhead(this.tsIsUnambiguouslyStartOfFunctionType.bind(this))\n      );\n    }\n\n    tsSkipParameterStart(): boolean {\n      if (this.match(tt.name) || this.match(tt._this)) {\n        this.next();\n        return true;\n      }\n\n      if (this.match(tt.braceL)) {\n        let braceStackCounter = 1;\n        this.next();\n\n        while (braceStackCounter > 0) {\n          if (this.match(tt.braceL)) {\n            ++braceStackCounter;\n          } else if (this.match(tt.braceR)) {\n            --braceStackCounter;\n          }\n          this.next();\n        }\n        return true;\n      }\n\n      if (this.match(tt.bracketL)) {\n        let braceStackCounter = 1;\n        this.next();\n\n        while (braceStackCounter > 0) {\n          if (this.match(tt.bracketL)) {\n            ++braceStackCounter;\n          } else if (this.match(tt.bracketR)) {\n            --braceStackCounter;\n          }\n          this.next();\n        }\n        return true;\n      }\n\n      return false;\n    }\n\n    tsIsUnambiguouslyStartOfFunctionType(): boolean {\n      this.next();\n      if (this.match(tt.parenR) || this.match(tt.ellipsis)) {\n        // ( )\n        // ( ...\n        return true;\n      }\n      if (this.tsSkipParameterStart()) {\n        if (\n          this.match(tt.colon) ||\n          this.match(tt.comma) ||\n          this.match(tt.question) ||\n          this.match(tt.eq)\n        ) {\n          // ( xxx :\n          // ( xxx ,\n          // ( xxx ?\n          // ( xxx =\n          return true;\n        }\n        if (this.match(tt.parenR)) {\n          this.next();\n          if (this.match(tt.arrow)) {\n            // ( xxx ) =>\n            return true;\n          }\n        }\n      }\n      return false;\n    }\n\n    tsParseTypeOrTypePredicateAnnotation(\n      returnToken: TokenType,\n    ): N.TsTypeAnnotation {\n      return this.tsInType(() => {\n        const t: N.TsTypeAnnotation = this.startNode();\n        this.expect(returnToken);\n\n        const asserts = this.tsTryParse(\n          this.tsParseTypePredicateAsserts.bind(this),\n        );\n\n        if (asserts && this.match(tt._this)) {\n          // When asserts is false, thisKeyword is handled by tsParseNonArrayType\n          // : asserts this is type\n          let thisTypePredicate = this.tsParseThisTypeOrThisTypePredicate();\n          // if it turns out to be a `TSThisType`, wrap it with `TSTypePredicate`\n          // : asserts this\n          if (thisTypePredicate.type === \"TSThisType\") {\n            const node: N.TsTypePredicate = this.startNodeAtNode(t);\n            node.parameterName = (thisTypePredicate: N.TsThisType);\n            node.asserts = true;\n            thisTypePredicate = this.finishNode(node, \"TSTypePredicate\");\n          } else {\n            (thisTypePredicate: N.TsTypePredicate).asserts = true;\n          }\n          t.typeAnnotation = thisTypePredicate;\n          return this.finishNode(t, \"TSTypeAnnotation\");\n        }\n\n        const typePredicateVariable =\n          this.tsIsIdentifier() &&\n          this.tsTryParse(this.tsParseTypePredicatePrefix.bind(this));\n\n        if (!typePredicateVariable) {\n          if (!asserts) {\n            // : type\n            return this.tsParseTypeAnnotation(/* eatColon */ false, t);\n          }\n\n          const node: N.TsTypePredicate = this.startNodeAtNode(t);\n          // : asserts foo\n          node.parameterName = this.parseIdentifier();\n          node.asserts = asserts;\n          t.typeAnnotation = this.finishNode(node, \"TSTypePredicate\");\n          return this.finishNode(t, \"TSTypeAnnotation\");\n        }\n\n        // : asserts foo is type\n        const type = this.tsParseTypeAnnotation(/* eatColon */ false);\n        const node = this.startNodeAtNode(t);\n        node.parameterName = typePredicateVariable;\n        node.typeAnnotation = type;\n        node.asserts = asserts;\n        t.typeAnnotation = this.finishNode(node, \"TSTypePredicate\");\n        return this.finishNode(t, \"TSTypeAnnotation\");\n      });\n    }\n\n    tsTryParseTypeOrTypePredicateAnnotation(): ?N.TsTypeAnnotation {\n      return this.match(tt.colon)\n        ? this.tsParseTypeOrTypePredicateAnnotation(tt.colon)\n        : undefined;\n    }\n\n    tsTryParseTypeAnnotation(): ?N.TsTypeAnnotation {\n      return this.match(tt.colon) ? this.tsParseTypeAnnotation() : undefined;\n    }\n\n    tsTryParseType(): ?N.TsType {\n      return this.tsEatThenParseType(tt.colon);\n    }\n\n    tsParseTypePredicatePrefix(): ?N.Identifier {\n      const id = this.parseIdentifier();\n      if (this.isContextual(\"is\") && !this.hasPrecedingLineBreak()) {\n        this.next();\n        return id;\n      }\n    }\n\n    tsParseTypePredicateAsserts(): boolean {\n      if (\n        !this.match(tt.name) ||\n        this.state.value !== \"asserts\" ||\n        this.hasPrecedingLineBreak()\n      ) {\n        return false;\n      }\n      const containsEsc = this.state.containsEsc;\n      this.next();\n      if (!this.match(tt.name) && !this.match(tt._this)) {\n        return false;\n      }\n\n      if (containsEsc) {\n        this.raise(\n          this.state.lastTokStart,\n          Errors.InvalidEscapedReservedWord,\n          \"asserts\",\n        );\n      }\n\n      return true;\n    }\n\n    tsParseTypeAnnotation(\n      eatColon = true,\n      t: N.TsTypeAnnotation = this.startNode(),\n    ): N.TsTypeAnnotation {\n      this.tsInType(() => {\n        if (eatColon) this.expect(tt.colon);\n        t.typeAnnotation = this.tsParseType();\n      });\n      return this.finishNode(t, \"TSTypeAnnotation\");\n    }\n\n    /** Be sure to be in a type context before calling this, using `tsInType`. */\n    tsParseType(): N.TsType {\n      // Need to set `state.inType` so that we don't parse JSX in a type context.\n      assert(this.state.inType);\n      const type = this.tsParseNonConditionalType();\n      if (this.hasPrecedingLineBreak() || !this.eat(tt._extends)) {\n        return type;\n      }\n      const node: N.TsConditionalType = this.startNodeAtNode(type);\n      node.checkType = type;\n      node.extendsType = this.tsParseNonConditionalType();\n      this.expect(tt.question);\n      node.trueType = this.tsParseType();\n      this.expect(tt.colon);\n      node.falseType = this.tsParseType();\n      return this.finishNode(node, \"TSConditionalType\");\n    }\n\n    tsParseNonConditionalType(): N.TsType {\n      if (this.tsIsStartOfFunctionType()) {\n        return this.tsParseFunctionOrConstructorType(\"TSFunctionType\");\n      }\n      if (this.match(tt._new)) {\n        // As in `new () => Date`\n        return this.tsParseFunctionOrConstructorType(\"TSConstructorType\");\n      }\n      return this.tsParseUnionTypeOrHigher();\n    }\n\n    tsParseTypeAssertion(): N.TsTypeAssertion {\n      const node: N.TsTypeAssertion = this.startNode();\n      const _const = this.tsTryNextParseConstantContext();\n      node.typeAnnotation = _const || this.tsNextThenParseType();\n      this.expectRelational(\">\");\n      node.expression = this.parseMaybeUnary();\n      return this.finishNode(node, \"TSTypeAssertion\");\n    }\n\n    tsParseHeritageClause(\n      descriptor: string,\n    ): $ReadOnlyArray<N.TsExpressionWithTypeArguments> {\n      const originalStart = this.state.start;\n\n      const delimitedList = this.tsParseDelimitedList(\n        \"HeritageClauseElement\",\n        this.tsParseExpressionWithTypeArguments.bind(this),\n      );\n\n      if (!delimitedList.length) {\n        this.raise(originalStart, TSErrors.EmptyHeritageClauseType, descriptor);\n      }\n\n      return delimitedList;\n    }\n\n    tsParseExpressionWithTypeArguments(): N.TsExpressionWithTypeArguments {\n      const node: N.TsExpressionWithTypeArguments = this.startNode();\n      // Note: TS uses parseLeftHandSideExpressionOrHigher,\n      // then has grammar errors later if it's not an EntityName.\n      node.expression = this.tsParseEntityName(/* allowReservedWords */ false);\n      if (this.isRelational(\"<\")) {\n        node.typeParameters = this.tsParseTypeArguments();\n      }\n\n      return this.finishNode(node, \"TSExpressionWithTypeArguments\");\n    }\n\n    tsParseInterfaceDeclaration(\n      node: N.TsInterfaceDeclaration,\n    ): N.TsInterfaceDeclaration {\n      node.id = this.parseIdentifier();\n      this.checkLVal(\n        node.id,\n        BIND_TS_INTERFACE,\n        undefined,\n        \"typescript interface declaration\",\n      );\n      node.typeParameters = this.tsTryParseTypeParameters();\n      if (this.eat(tt._extends)) {\n        node.extends = this.tsParseHeritageClause(\"extends\");\n      }\n      const body: N.TSInterfaceBody = this.startNode();\n      body.body = this.tsInType(this.tsParseObjectTypeMembers.bind(this));\n      node.body = this.finishNode(body, \"TSInterfaceBody\");\n      return this.finishNode(node, \"TSInterfaceDeclaration\");\n    }\n\n    tsParseTypeAliasDeclaration(\n      node: N.TsTypeAliasDeclaration,\n    ): N.TsTypeAliasDeclaration {\n      node.id = this.parseIdentifier();\n      this.checkLVal(node.id, BIND_TS_TYPE, undefined, \"typescript type alias\");\n\n      node.typeParameters = this.tsTryParseTypeParameters();\n      node.typeAnnotation = this.tsExpectThenParseType(tt.eq);\n      this.semicolon();\n      return this.finishNode(node, \"TSTypeAliasDeclaration\");\n    }\n\n    tsInNoContext<T>(cb: () => T): T {\n      const oldContext = this.state.context;\n      this.state.context = [oldContext[0]];\n      try {\n        return cb();\n      } finally {\n        this.state.context = oldContext;\n      }\n    }\n\n    /**\n     * Runs `cb` in a type context.\n     * This should be called one token *before* the first type token,\n     * so that the call to `next()` is run in type context.\n     */\n    tsInType<T>(cb: () => T): T {\n      const oldInType = this.state.inType;\n      this.state.inType = true;\n      try {\n        return cb();\n      } finally {\n        this.state.inType = oldInType;\n      }\n    }\n\n    tsEatThenParseType(token: TokenType): N.TsType | typeof undefined {\n      return !this.match(token) ? undefined : this.tsNextThenParseType();\n    }\n\n    tsExpectThenParseType(token: TokenType): N.TsType {\n      return this.tsDoThenParseType(() => this.expect(token));\n    }\n\n    tsNextThenParseType(): N.TsType {\n      return this.tsDoThenParseType(() => this.next());\n    }\n\n    tsDoThenParseType(cb: () => void): N.TsType {\n      return this.tsInType(() => {\n        cb();\n        return this.tsParseType();\n      });\n    }\n\n    tsParseEnumMember(): N.TsEnumMember {\n      const node: N.TsEnumMember = this.startNode();\n      // Computed property names are grammar errors in an enum, so accept just string literal or identifier.\n      node.id = this.match(tt.string)\n        ? this.parseExprAtom()\n        : this.parseIdentifier(/* liberal */ true);\n      if (this.eat(tt.eq)) {\n        node.initializer = this.parseMaybeAssign();\n      }\n      return this.finishNode(node, \"TSEnumMember\");\n    }\n\n    tsParseEnumDeclaration(\n      node: N.TsEnumDeclaration,\n      isConst: boolean,\n    ): N.TsEnumDeclaration {\n      if (isConst) node.const = true;\n      node.id = this.parseIdentifier();\n      this.checkLVal(\n        node.id,\n        isConst ? BIND_TS_CONST_ENUM : BIND_TS_ENUM,\n        undefined,\n        \"typescript enum declaration\",\n      );\n\n      this.expect(tt.braceL);\n      node.members = this.tsParseDelimitedList(\n        \"EnumMembers\",\n        this.tsParseEnumMember.bind(this),\n      );\n      this.expect(tt.braceR);\n      return this.finishNode(node, \"TSEnumDeclaration\");\n    }\n\n    tsParseModuleBlock(): N.TsModuleBlock {\n      const node: N.TsModuleBlock = this.startNode();\n      this.scope.enter(SCOPE_OTHER);\n\n      this.expect(tt.braceL);\n      // Inside of a module block is considered \"top-level\", meaning it can have imports and exports.\n      this.parseBlockOrModuleBlockBody(\n        (node.body = []),\n        /* directives */ undefined,\n        /* topLevel */ true,\n        /* end */ tt.braceR,\n      );\n      this.scope.exit();\n      return this.finishNode(node, \"TSModuleBlock\");\n    }\n\n    tsParseModuleOrNamespaceDeclaration(\n      node: N.TsModuleDeclaration,\n      nested?: boolean = false,\n    ): N.TsModuleDeclaration {\n      node.id = this.parseIdentifier();\n\n      if (!nested) {\n        this.checkLVal(\n          node.id,\n          BIND_TS_NAMESPACE,\n          null,\n          \"module or namespace declaration\",\n        );\n      }\n\n      if (this.eat(tt.dot)) {\n        const inner = this.startNode();\n        this.tsParseModuleOrNamespaceDeclaration(inner, true);\n        node.body = inner;\n      } else {\n        this.scope.enter(SCOPE_TS_MODULE);\n        this.prodParam.enter(PARAM);\n        node.body = this.tsParseModuleBlock();\n        this.prodParam.exit();\n        this.scope.exit();\n      }\n      return this.finishNode(node, \"TSModuleDeclaration\");\n    }\n\n    tsParseAmbientExternalModuleDeclaration(\n      node: N.TsModuleDeclaration,\n    ): N.TsModuleDeclaration {\n      if (this.isContextual(\"global\")) {\n        node.global = true;\n        node.id = this.parseIdentifier();\n      } else if (this.match(tt.string)) {\n        node.id = this.parseExprAtom();\n      } else {\n        this.unexpected();\n      }\n      if (this.match(tt.braceL)) {\n        this.scope.enter(SCOPE_TS_MODULE);\n        this.prodParam.enter(PARAM);\n        node.body = this.tsParseModuleBlock();\n        this.prodParam.exit();\n        this.scope.exit();\n      } else {\n        this.semicolon();\n      }\n\n      return this.finishNode(node, \"TSModuleDeclaration\");\n    }\n\n    tsParseImportEqualsDeclaration(\n      node: N.TsImportEqualsDeclaration,\n      isExport?: boolean,\n    ): N.TsImportEqualsDeclaration {\n      node.isExport = isExport || false;\n      node.id = this.parseIdentifier();\n      this.checkLVal(\n        node.id,\n        BIND_LEXICAL,\n        undefined,\n        \"import equals declaration\",\n      );\n      this.expect(tt.eq);\n      node.moduleReference = this.tsParseModuleReference();\n      this.semicolon();\n      return this.finishNode(node, \"TSImportEqualsDeclaration\");\n    }\n\n    tsIsExternalModuleReference(): boolean {\n      return (\n        this.isContextual(\"require\") &&\n        this.lookaheadCharCode() === charCodes.leftParenthesis\n      );\n    }\n\n    tsParseModuleReference(): N.TsModuleReference {\n      return this.tsIsExternalModuleReference()\n        ? this.tsParseExternalModuleReference()\n        : this.tsParseEntityName(/* allowReservedWords */ false);\n    }\n\n    tsParseExternalModuleReference(): N.TsExternalModuleReference {\n      const node: N.TsExternalModuleReference = this.startNode();\n      this.expectContextual(\"require\");\n      this.expect(tt.parenL);\n      if (!this.match(tt.string)) {\n        throw this.unexpected();\n      }\n      // For compatibility to estree we cannot call parseLiteral directly here\n      node.expression = this.parseExprAtom();\n      this.expect(tt.parenR);\n      return this.finishNode(node, \"TSExternalModuleReference\");\n    }\n\n    // Utilities\n\n    tsLookAhead<T>(f: () => T): T {\n      const state = this.state.clone();\n      const res = f();\n      this.state = state;\n      return res;\n    }\n\n    tsTryParseAndCatch<T: ?N.NodeBase>(f: () => T): ?T {\n      const result = this.tryParse(abort => f() || abort());\n\n      if (result.aborted || !result.node) return undefined;\n      if (result.error) this.state = result.failState;\n      return result.node;\n    }\n\n    tsTryParse<T>(f: () => ?T): ?T {\n      const state = this.state.clone();\n      const result = f();\n      if (result !== undefined && result !== false) {\n        return result;\n      } else {\n        this.state = state;\n        return undefined;\n      }\n    }\n\n    tsTryParseDeclare(nany: any): ?N.Declaration {\n      if (this.isLineTerminator()) {\n        return;\n      }\n      let starttype = this.state.type;\n      let kind;\n\n      if (this.isContextual(\"let\")) {\n        starttype = tt._var;\n        kind = \"let\";\n      }\n\n      switch (starttype) {\n        case tt._function:\n          return this.parseFunctionStatement(\n            nany,\n            /* async */ false,\n            /* declarationPosition */ true,\n          );\n        case tt._class:\n          // While this is also set by tsParseExpressionStatement, we need to set it\n          // before parsing the class declaration to now how to register it in the scope.\n          nany.declare = true;\n          return this.parseClass(\n            nany,\n            /* isStatement */ true,\n            /* optionalId */ false,\n          );\n        case tt._const:\n          if (this.match(tt._const) && this.isLookaheadContextual(\"enum\")) {\n            // `const enum = 0;` not allowed because \"enum\" is a strict mode reserved word.\n            this.expect(tt._const);\n            this.expectContextual(\"enum\");\n            return this.tsParseEnumDeclaration(nany, /* isConst */ true);\n          }\n        // falls through\n        case tt._var:\n          kind = kind || this.state.value;\n          return this.parseVarStatement(nany, kind);\n        case tt.name: {\n          const value = this.state.value;\n          if (value === \"global\") {\n            return this.tsParseAmbientExternalModuleDeclaration(nany);\n          } else {\n            return this.tsParseDeclaration(nany, value, /* next */ true);\n          }\n        }\n      }\n    }\n\n    // Note: this won't be called unless the keyword is allowed in `shouldParseExportDeclaration`.\n    tsTryParseExportDeclaration(): ?N.Declaration {\n      return this.tsParseDeclaration(\n        this.startNode(),\n        this.state.value,\n        /* next */ true,\n      );\n    }\n\n    tsParseExpressionStatement(node: any, expr: N.Identifier): ?N.Declaration {\n      switch (expr.name) {\n        case \"declare\": {\n          const declaration = this.tsTryParseDeclare(node);\n          if (declaration) {\n            declaration.declare = true;\n            return declaration;\n          }\n          break;\n        }\n        case \"global\":\n          // `global { }` (with no `declare`) may appear inside an ambient module declaration.\n          // Would like to use tsParseAmbientExternalModuleDeclaration here, but already ran past \"global\".\n          if (this.match(tt.braceL)) {\n            this.scope.enter(SCOPE_TS_MODULE);\n            this.prodParam.enter(PARAM);\n            const mod: N.TsModuleDeclaration = node;\n            mod.global = true;\n            mod.id = expr;\n            mod.body = this.tsParseModuleBlock();\n            this.scope.exit();\n            this.prodParam.exit();\n            return this.finishNode(mod, \"TSModuleDeclaration\");\n          }\n          break;\n\n        default:\n          return this.tsParseDeclaration(node, expr.name, /* next */ false);\n      }\n    }\n\n    // Common to tsTryParseDeclare, tsTryParseExportDeclaration, and tsParseExpressionStatement.\n    tsParseDeclaration(\n      node: any,\n      value: string,\n      next: boolean,\n    ): ?N.Declaration {\n      switch (value) {\n        case \"abstract\":\n          if (this.tsCheckLineTerminatorAndMatch(tt._class, next)) {\n            const cls: N.ClassDeclaration = node;\n            cls.abstract = true;\n            if (next) {\n              this.next();\n              if (!this.match(tt._class)) {\n                this.unexpected(null, tt._class);\n              }\n            }\n            return this.parseClass(\n              cls,\n              /* isStatement */ true,\n              /* optionalId */ false,\n            );\n          }\n          break;\n\n        case \"enum\":\n          if (next || this.match(tt.name)) {\n            if (next) this.next();\n            return this.tsParseEnumDeclaration(node, /* isConst */ false);\n          }\n          break;\n\n        case \"interface\":\n          if (this.tsCheckLineTerminatorAndMatch(tt.name, next)) {\n            if (next) this.next();\n            return this.tsParseInterfaceDeclaration(node);\n          }\n          break;\n\n        case \"module\":\n          if (next) this.next();\n          if (this.match(tt.string)) {\n            return this.tsParseAmbientExternalModuleDeclaration(node);\n          } else if (this.tsCheckLineTerminatorAndMatch(tt.name, next)) {\n            return this.tsParseModuleOrNamespaceDeclaration(node);\n          }\n          break;\n\n        case \"namespace\":\n          if (this.tsCheckLineTerminatorAndMatch(tt.name, next)) {\n            if (next) this.next();\n            return this.tsParseModuleOrNamespaceDeclaration(node);\n          }\n          break;\n\n        case \"type\":\n          if (this.tsCheckLineTerminatorAndMatch(tt.name, next)) {\n            if (next) this.next();\n            return this.tsParseTypeAliasDeclaration(node);\n          }\n          break;\n      }\n    }\n\n    tsCheckLineTerminatorAndMatch(tokenType: TokenType, next: boolean) {\n      return (next || this.match(tokenType)) && !this.isLineTerminator();\n    }\n\n    tsTryParseGenericAsyncArrowFunction(\n      startPos: number,\n      startLoc: Position,\n    ): ?N.ArrowFunctionExpression {\n      if (!this.isRelational(\"<\")) {\n        return undefined;\n      }\n\n      const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n      const oldYieldPos = this.state.yieldPos;\n      const oldAwaitPos = this.state.awaitPos;\n      this.state.maybeInArrowParameters = true;\n      this.state.yieldPos = -1;\n      this.state.awaitPos = -1;\n\n      const res: ?N.ArrowFunctionExpression = this.tsTryParseAndCatch(() => {\n        const node: N.ArrowFunctionExpression = this.startNodeAt(\n          startPos,\n          startLoc,\n        );\n        node.typeParameters = this.tsParseTypeParameters();\n        // Don't use overloaded parseFunctionParams which would look for \"<\" again.\n        super.parseFunctionParams(node);\n        node.returnType = this.tsTryParseTypeOrTypePredicateAnnotation();\n        this.expect(tt.arrow);\n        return node;\n      });\n\n      this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n      this.state.yieldPos = oldYieldPos;\n      this.state.awaitPos = oldAwaitPos;\n\n      if (!res) {\n        return undefined;\n      }\n\n      return this.parseArrowExpression(\n        res,\n        /* params are already set */ null,\n        /* async */ true,\n      );\n    }\n\n    tsParseTypeArguments(): N.TsTypeParameterInstantiation {\n      const node = this.startNode();\n      node.params = this.tsInType(() =>\n        // Temporarily remove a JSX parsing context, which makes us scan different tokens.\n        this.tsInNoContext(() => {\n          this.expectRelational(\"<\");\n          return this.tsParseDelimitedList(\n            \"TypeParametersOrArguments\",\n            this.tsParseType.bind(this),\n          );\n        }),\n      );\n      // This reads the next token after the `>` too, so do this in the enclosing context.\n      // But be sure not to parse a regex in the jsx expression `<C<number> />`, so set exprAllowed = false\n      this.state.exprAllowed = false;\n      this.expectRelational(\">\");\n      return this.finishNode(node, \"TSTypeParameterInstantiation\");\n    }\n\n    tsIsDeclarationStart(): boolean {\n      if (this.match(tt.name)) {\n        switch (this.state.value) {\n          case \"abstract\":\n          case \"declare\":\n          case \"enum\":\n          case \"interface\":\n          case \"module\":\n          case \"namespace\":\n          case \"type\":\n            return true;\n        }\n      }\n\n      return false;\n    }\n\n    // ======================================================\n    // OVERRIDES\n    // ======================================================\n\n    isExportDefaultSpecifier(): boolean {\n      if (this.tsIsDeclarationStart()) return false;\n      return super.isExportDefaultSpecifier();\n    }\n\n    parseAssignableListItem(\n      allowModifiers: ?boolean,\n      decorators: N.Decorator[],\n    ): N.Pattern | N.TSParameterProperty {\n      // Store original location/position to include modifiers in range\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n\n      let accessibility: ?N.Accessibility;\n      let readonly = false;\n      if (allowModifiers) {\n        accessibility = this.parseAccessModifier();\n        readonly = !!this.tsParseModifier([\"readonly\"]);\n      }\n\n      const left = this.parseMaybeDefault();\n      this.parseAssignableListItemTypes(left);\n      const elt = this.parseMaybeDefault(left.start, left.loc.start, left);\n      if (accessibility || readonly) {\n        const pp: N.TSParameterProperty = this.startNodeAt(startPos, startLoc);\n        if (decorators.length) {\n          pp.decorators = decorators;\n        }\n        if (accessibility) pp.accessibility = accessibility;\n        if (readonly) pp.readonly = readonly;\n        if (elt.type !== \"Identifier\" && elt.type !== \"AssignmentPattern\") {\n          this.raise(pp.start, TSErrors.UnsupportedParameterPropertyKind);\n        }\n        pp.parameter = ((elt: any): N.Identifier | N.AssignmentPattern);\n        return this.finishNode(pp, \"TSParameterProperty\");\n      }\n\n      if (decorators.length) {\n        left.decorators = decorators;\n      }\n\n      return elt;\n    }\n\n    parseFunctionBodyAndFinish(\n      node: N.BodilessFunctionOrMethodBase,\n      type: string,\n      isMethod?: boolean = false,\n    ): void {\n      if (this.match(tt.colon)) {\n        node.returnType = this.tsParseTypeOrTypePredicateAnnotation(tt.colon);\n      }\n\n      const bodilessType =\n        type === \"FunctionDeclaration\"\n          ? \"TSDeclareFunction\"\n          : type === \"ClassMethod\"\n          ? \"TSDeclareMethod\"\n          : undefined;\n      if (bodilessType && !this.match(tt.braceL) && this.isLineTerminator()) {\n        this.finishNode(node, bodilessType);\n        return;\n      }\n\n      super.parseFunctionBodyAndFinish(node, type, isMethod);\n    }\n\n    registerFunctionStatementId(node: N.Function): void {\n      if (!node.body && node.id) {\n        // Function ids are validated after parsing their body.\n        // For bodyless function, we need to do it here.\n        this.checkLVal(node.id, BIND_TS_AMBIENT, null, \"function name\");\n      } else {\n        super.registerFunctionStatementId(...arguments);\n      }\n    }\n\n    parseSubscript(\n      base: N.Expression,\n      startPos: number,\n      startLoc: Position,\n      noCalls: ?boolean,\n      state: N.ParseSubscriptState,\n    ): N.Expression {\n      if (!this.hasPrecedingLineBreak() && this.match(tt.bang)) {\n        this.state.exprAllowed = false;\n        this.next();\n\n        const nonNullExpression: N.TsNonNullExpression = this.startNodeAt(\n          startPos,\n          startLoc,\n        );\n        nonNullExpression.expression = base;\n        return this.finishNode(nonNullExpression, \"TSNonNullExpression\");\n      }\n\n      if (this.isRelational(\"<\")) {\n        // tsTryParseAndCatch is expensive, so avoid if not necessary.\n        // There are number of things we are going to \"maybe\" parse, like type arguments on\n        // tagged template expressions. If any of them fail, walk it back and continue.\n        const result = this.tsTryParseAndCatch(() => {\n          if (!noCalls && this.atPossibleAsyncArrow(base)) {\n            // Almost certainly this is a generic async function `async <T>() => ...\n            // But it might be a call with a type argument `async<T>();`\n            const asyncArrowFn = this.tsTryParseGenericAsyncArrowFunction(\n              startPos,\n              startLoc,\n            );\n            if (asyncArrowFn) {\n              return asyncArrowFn;\n            }\n          }\n\n          const node: N.CallExpression = this.startNodeAt(startPos, startLoc);\n          node.callee = base;\n\n          const typeArguments = this.tsParseTypeArguments();\n\n          if (typeArguments) {\n            if (!noCalls && this.eat(tt.parenL)) {\n              // possibleAsync always false here, because we would have handled it above.\n              // $FlowIgnore (won't be any undefined arguments)\n              node.arguments = this.parseCallExpressionArguments(\n                tt.parenR,\n                /* possibleAsync */ false,\n              );\n              node.typeParameters = typeArguments;\n              return this.finishCallExpression(node, state.optionalChainMember);\n            } else if (this.match(tt.backQuote)) {\n              return this.parseTaggedTemplateExpression(\n                startPos,\n                startLoc,\n                base,\n                state,\n                typeArguments,\n              );\n            }\n          }\n\n          this.unexpected();\n        });\n\n        if (result) return result;\n      }\n\n      return super.parseSubscript(base, startPos, startLoc, noCalls, state);\n    }\n\n    parseNewArguments(node: N.NewExpression): void {\n      if (this.isRelational(\"<\")) {\n        // tsTryParseAndCatch is expensive, so avoid if not necessary.\n        // 99% certain this is `new C<T>();`. But may be `new C < T;`, which is also legal.\n        const typeParameters = this.tsTryParseAndCatch(() => {\n          const args = this.tsParseTypeArguments();\n          if (!this.match(tt.parenL)) this.unexpected();\n          return args;\n        });\n        if (typeParameters) {\n          node.typeParameters = typeParameters;\n        }\n      }\n\n      super.parseNewArguments(node);\n    }\n\n    parseExprOp(\n      left: N.Expression,\n      leftStartPos: number,\n      leftStartLoc: Position,\n      minPrec: number,\n      noIn: ?boolean,\n    ) {\n      if (\n        nonNull(tt._in.binop) > minPrec &&\n        !this.hasPrecedingLineBreak() &&\n        this.isContextual(\"as\")\n      ) {\n        const node: N.TsAsExpression = this.startNodeAt(\n          leftStartPos,\n          leftStartLoc,\n        );\n        node.expression = left;\n        const _const = this.tsTryNextParseConstantContext();\n        if (_const) {\n          node.typeAnnotation = _const;\n        } else {\n          node.typeAnnotation = this.tsNextThenParseType();\n        }\n        this.finishNode(node, \"TSAsExpression\");\n        return this.parseExprOp(\n          node,\n          leftStartPos,\n          leftStartLoc,\n          minPrec,\n          noIn,\n        );\n      }\n\n      return super.parseExprOp(left, leftStartPos, leftStartLoc, minPrec, noIn);\n    }\n\n    checkReservedWord(\n      word: string, // eslint-disable-line no-unused-vars\n      startLoc: number, // eslint-disable-line no-unused-vars\n      checkKeywords: boolean, // eslint-disable-line no-unused-vars\n      // eslint-disable-next-line no-unused-vars\n      isBinding: boolean,\n    ): void {\n      // Don't bother checking for TypeScript code.\n      // Strict mode words may be allowed as in `declare namespace N { const static: number; }`.\n      // And we have a type checker anyway, so don't bother having the parser do it.\n    }\n\n    /*\n    Don't bother doing this check in TypeScript code because:\n    1. We may have a nested export statement with the same name:\n      export const x = 0;\n      export namespace N {\n        export const x = 1;\n      }\n    2. We have a type checker to warn us about this sort of thing.\n    */\n    checkDuplicateExports() {}\n\n    parseImport(node: N.Node): N.AnyImport {\n      if (this.match(tt.name) || this.match(tt.star) || this.match(tt.braceL)) {\n        const ahead = this.lookahead();\n\n        if (this.match(tt.name) && ahead.type === tt.eq) {\n          return this.tsParseImportEqualsDeclaration(node);\n        }\n\n        if (\n          this.isContextual(\"type\") &&\n          // import type, { a } from \"b\";\n          ahead.type !== tt.comma &&\n          // import type from \"a\";\n          !(ahead.type === tt.name && ahead.value === \"from\")\n        ) {\n          node.importKind = \"type\";\n          this.next();\n        } else {\n          node.importKind = \"value\";\n        }\n      }\n\n      const importNode = super.parseImport(node);\n      /*:: invariant(importNode.type !== \"TSImportEqualsDeclaration\") */\n\n      // `import type` can only be used on imports with named imports or with a\n      // default import - but not both\n      if (\n        importNode.importKind === \"type\" &&\n        importNode.specifiers.length > 1 &&\n        importNode.specifiers[0].type === \"ImportDefaultSpecifier\"\n      ) {\n        this.raise(\n          importNode.start,\n          \"A type-only import can specify a default import or named bindings, but not both.\",\n        );\n      }\n\n      return importNode;\n    }\n\n    parseExport(node: N.Node): N.AnyExport {\n      if (this.match(tt._import)) {\n        // `export import A = B;`\n        this.expect(tt._import);\n        return this.tsParseImportEqualsDeclaration(node, /* isExport */ true);\n      } else if (this.eat(tt.eq)) {\n        // `export = x;`\n        const assign: N.TsExportAssignment = node;\n        assign.expression = this.parseExpression();\n        this.semicolon();\n        return this.finishNode(assign, \"TSExportAssignment\");\n      } else if (this.eatContextual(\"as\")) {\n        // `export as namespace A;`\n        const decl: N.TsNamespaceExportDeclaration = node;\n        // See `parseNamespaceExportDeclaration` in TypeScript's own parser\n        this.expectContextual(\"namespace\");\n        decl.id = this.parseIdentifier();\n        this.semicolon();\n        return this.finishNode(decl, \"TSNamespaceExportDeclaration\");\n      } else {\n        if (this.isContextual(\"type\") && this.lookahead().type === tt.braceL) {\n          this.next();\n          node.exportKind = \"type\";\n        } else {\n          node.exportKind = \"value\";\n        }\n\n        return super.parseExport(node);\n      }\n    }\n\n    isAbstractClass(): boolean {\n      return (\n        this.isContextual(\"abstract\") && this.lookahead().type === tt._class\n      );\n    }\n\n    parseExportDefaultExpression(): N.Expression | N.Declaration {\n      if (this.isAbstractClass()) {\n        const cls = this.startNode();\n        this.next(); // Skip \"abstract\"\n        this.parseClass(cls, true, true);\n        cls.abstract = true;\n        return cls;\n      }\n\n      // export default interface allowed in:\n      // https://github.com/Microsoft/TypeScript/pull/16040\n      if (this.state.value === \"interface\") {\n        const result = this.tsParseDeclaration(\n          this.startNode(),\n          this.state.value,\n          true,\n        );\n\n        if (result) return result;\n      }\n\n      return super.parseExportDefaultExpression();\n    }\n\n    parseStatementContent(context: ?string, topLevel: ?boolean): N.Statement {\n      if (this.state.type === tt._const) {\n        const ahead = this.lookahead();\n        if (ahead.type === tt.name && ahead.value === \"enum\") {\n          const node: N.TsEnumDeclaration = this.startNode();\n          this.expect(tt._const);\n          this.expectContextual(\"enum\");\n          return this.tsParseEnumDeclaration(node, /* isConst */ true);\n        }\n      }\n      return super.parseStatementContent(context, topLevel);\n    }\n\n    parseAccessModifier(): ?N.Accessibility {\n      return this.tsParseModifier([\"public\", \"protected\", \"private\"]);\n    }\n\n    parseClassMember(\n      classBody: N.ClassBody,\n      member: any,\n      state: { hadConstructor: boolean },\n      constructorAllowsSuper: boolean,\n    ): void {\n      this.tsParseModifiers(member, [\"declare\"]);\n      const accessibility = this.parseAccessModifier();\n      if (accessibility) member.accessibility = accessibility;\n      this.tsParseModifiers(member, [\"declare\"]);\n\n      super.parseClassMember(classBody, member, state, constructorAllowsSuper);\n    }\n\n    parseClassMemberWithIsStatic(\n      classBody: N.ClassBody,\n      member: N.ClassMember | N.TsIndexSignature,\n      state: { hadConstructor: boolean },\n      isStatic: boolean,\n      constructorAllowsSuper: boolean,\n    ): void {\n      this.tsParseModifiers(member, [\"abstract\", \"readonly\", \"declare\"]);\n\n      const idx = this.tsTryParseIndexSignature(member);\n      if (idx) {\n        classBody.body.push(idx);\n\n        if ((member: any).abstract) {\n          this.raise(member.start, TSErrors.IndexSignatureHasAbstract);\n        }\n        if (isStatic) {\n          this.raise(member.start, TSErrors.IndexSignatureHasStatic);\n        }\n        if ((member: any).accessibility) {\n          this.raise(\n            member.start,\n            TSErrors.IndexSignatureHasAccessibility,\n            (member: any).accessibility,\n          );\n        }\n\n        return;\n      }\n\n      /*:: invariant(member.type !== \"TSIndexSignature\") */\n\n      super.parseClassMemberWithIsStatic(\n        classBody,\n        member,\n        state,\n        isStatic,\n        constructorAllowsSuper,\n      );\n    }\n\n    parsePostMemberNameModifiers(\n      methodOrProp: N.ClassMethod | N.ClassProperty | N.ClassPrivateProperty,\n    ): void {\n      const optional = this.eat(tt.question);\n      if (optional) methodOrProp.optional = true;\n\n      if ((methodOrProp: any).readonly && this.match(tt.parenL)) {\n        this.raise(methodOrProp.start, TSErrors.ClassMethodHasReadonly);\n      }\n\n      if ((methodOrProp: any).declare && this.match(tt.parenL)) {\n        this.raise(methodOrProp.start, TSErrors.ClassMethodHasDeclare);\n      }\n    }\n\n    // Note: The reason we do this in `parseExpressionStatement` and not `parseStatement`\n    // is that e.g. `type()` is valid JS, so we must try parsing that first.\n    // If it's really a type, we will parse `type` as the statement, and can correct it here\n    // by parsing the rest.\n    parseExpressionStatement(\n      node: N.ExpressionStatement,\n      expr: N.Expression,\n    ): N.Statement {\n      const decl =\n        expr.type === \"Identifier\"\n          ? this.tsParseExpressionStatement(node, expr)\n          : undefined;\n      return decl || super.parseExpressionStatement(node, expr);\n    }\n\n    // export type\n    // Should be true for anything parsed by `tsTryParseExportDeclaration`.\n    shouldParseExportDeclaration(): boolean {\n      if (this.tsIsDeclarationStart()) return true;\n      return super.shouldParseExportDeclaration();\n    }\n\n    // An apparent conditional expression could actually be an optional parameter in an arrow function.\n    parseConditional(\n      expr: N.Expression,\n      noIn: ?boolean,\n      startPos: number,\n      startLoc: Position,\n      refNeedsArrowPos?: ?Pos,\n    ): N.Expression {\n      // only do the expensive clone if there is a question mark\n      // and if we come from inside parens\n      if (!refNeedsArrowPos || !this.match(tt.question)) {\n        return super.parseConditional(\n          expr,\n          noIn,\n          startPos,\n          startLoc,\n          refNeedsArrowPos,\n        );\n      }\n\n      const result = this.tryParse(() =>\n        super.parseConditional(expr, noIn, startPos, startLoc),\n      );\n\n      if (!result.node) {\n        // $FlowIgnore\n        refNeedsArrowPos.start = result.error.pos || this.state.start;\n        return expr;\n      }\n      if (result.error) this.state = result.failState;\n      return result.node;\n    }\n\n    // Note: These \"type casts\" are *not* valid TS expressions.\n    // But we parse them here and change them when completing the arrow function.\n    parseParenItem(\n      node: N.Expression,\n      startPos: number,\n      startLoc: Position,\n    ): N.Expression {\n      node = super.parseParenItem(node, startPos, startLoc);\n      if (this.eat(tt.question)) {\n        node.optional = true;\n        // Include questionmark in location of node\n        // Don't use this.finishNode() as otherwise we might process comments twice and\n        // include already consumed parens\n        this.resetEndLocation(node);\n      }\n\n      if (this.match(tt.colon)) {\n        const typeCastNode: N.TsTypeCastExpression = this.startNodeAt(\n          startPos,\n          startLoc,\n        );\n        typeCastNode.expression = node;\n        typeCastNode.typeAnnotation = this.tsParseTypeAnnotation();\n\n        return this.finishNode(typeCastNode, \"TSTypeCastExpression\");\n      }\n\n      return node;\n    }\n\n    parseExportDeclaration(node: N.ExportNamedDeclaration): ?N.Declaration {\n      // Store original location/position\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n\n      // \"export declare\" is equivalent to just \"export\".\n      const isDeclare = this.eatContextual(\"declare\");\n\n      let declaration: ?N.Declaration;\n\n      if (this.match(tt.name)) {\n        declaration = this.tsTryParseExportDeclaration();\n      }\n      if (!declaration) {\n        declaration = super.parseExportDeclaration(node);\n      }\n      if (\n        declaration &&\n        (declaration.type === \"TSInterfaceDeclaration\" ||\n          declaration.type === \"TSTypeAliasDeclaration\" ||\n          isDeclare)\n      ) {\n        node.exportKind = \"type\";\n      }\n\n      if (declaration && isDeclare) {\n        // Reset location to include `declare` in range\n        this.resetStartLocation(declaration, startPos, startLoc);\n\n        declaration.declare = true;\n      }\n\n      return declaration;\n    }\n\n    parseClassId(\n      node: N.Class,\n      isStatement: boolean,\n      optionalId: ?boolean,\n    ): void {\n      if ((!isStatement || optionalId) && this.isContextual(\"implements\")) {\n        return;\n      }\n\n      super.parseClassId(\n        node,\n        isStatement,\n        optionalId,\n        (node: any).declare ? BIND_TS_AMBIENT : BIND_CLASS,\n      );\n      const typeParameters = this.tsTryParseTypeParameters();\n      if (typeParameters) node.typeParameters = typeParameters;\n    }\n\n    parseClassPropertyAnnotation(\n      node: N.ClassProperty | N.ClassPrivateProperty,\n    ): void {\n      if (!node.optional && this.eat(tt.bang)) {\n        node.definite = true;\n      }\n\n      const type = this.tsTryParseTypeAnnotation();\n      if (type) node.typeAnnotation = type;\n    }\n\n    parseClassProperty(node: N.ClassProperty): N.ClassProperty {\n      this.parseClassPropertyAnnotation(node);\n\n      if (node.declare && this.match(tt.equal)) {\n        this.raise(this.state.start, TSErrors.DeclareClassFieldHasInitializer);\n      }\n\n      return super.parseClassProperty(node);\n    }\n\n    parseClassPrivateProperty(\n      node: N.ClassPrivateProperty,\n    ): N.ClassPrivateProperty {\n      // $FlowIgnore\n      if (node.abstract) {\n        this.raise(node.start, TSErrors.PrivateElementHasAbstract);\n      }\n\n      // $FlowIgnore\n      if (node.accessibility) {\n        this.raise(\n          node.start,\n          TSErrors.PrivateElementHasAccessibility,\n          node.accessibility,\n        );\n      }\n\n      this.parseClassPropertyAnnotation(node);\n      return super.parseClassPrivateProperty(node);\n    }\n\n    pushClassMethod(\n      classBody: N.ClassBody,\n      method: N.ClassMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n      isConstructor: boolean,\n      allowsDirectSuper: boolean,\n    ): void {\n      const typeParameters = this.tsTryParseTypeParameters();\n      if (typeParameters) method.typeParameters = typeParameters;\n      super.pushClassMethod(\n        classBody,\n        method,\n        isGenerator,\n        isAsync,\n        isConstructor,\n        allowsDirectSuper,\n      );\n    }\n\n    pushClassPrivateMethod(\n      classBody: N.ClassBody,\n      method: N.ClassPrivateMethod,\n      isGenerator: boolean,\n      isAsync: boolean,\n    ): void {\n      const typeParameters = this.tsTryParseTypeParameters();\n      if (typeParameters) method.typeParameters = typeParameters;\n      super.pushClassPrivateMethod(classBody, method, isGenerator, isAsync);\n    }\n\n    parseClassSuper(node: N.Class): void {\n      super.parseClassSuper(node);\n      if (node.superClass && this.isRelational(\"<\")) {\n        node.superTypeParameters = this.tsParseTypeArguments();\n      }\n      if (this.eatContextual(\"implements\")) {\n        node.implements = this.tsParseHeritageClause(\"implements\");\n      }\n    }\n\n    parseObjPropValue(prop: N.ObjectMember, ...args): void {\n      const typeParameters = this.tsTryParseTypeParameters();\n      if (typeParameters) prop.typeParameters = typeParameters;\n\n      super.parseObjPropValue(prop, ...args);\n    }\n\n    parseFunctionParams(node: N.Function, allowModifiers?: boolean): void {\n      const typeParameters = this.tsTryParseTypeParameters();\n      if (typeParameters) node.typeParameters = typeParameters;\n      super.parseFunctionParams(node, allowModifiers);\n    }\n\n    // `let x: number;`\n    parseVarId(\n      decl: N.VariableDeclarator,\n      kind: \"var\" | \"let\" | \"const\",\n    ): void {\n      super.parseVarId(decl, kind);\n      if (decl.id.type === \"Identifier\" && this.eat(tt.bang)) {\n        decl.definite = true;\n      }\n\n      const type = this.tsTryParseTypeAnnotation();\n      if (type) {\n        decl.id.typeAnnotation = type;\n        this.resetEndLocation(decl.id); // set end position to end of type\n      }\n    }\n\n    // parse the return type of an async arrow function - let foo = (async (): number => {});\n    parseAsyncArrowFromCallExpression(\n      node: N.ArrowFunctionExpression,\n      call: N.CallExpression,\n    ): N.ArrowFunctionExpression {\n      if (this.match(tt.colon)) {\n        node.returnType = this.tsParseTypeAnnotation();\n      }\n      return super.parseAsyncArrowFromCallExpression(node, call);\n    }\n\n    parseMaybeAssign(...args): N.Expression {\n      // Note: When the JSX plugin is on, type assertions (`<T> x`) aren't valid syntax.\n\n      let state: ?State;\n      let jsx;\n      let typeCast;\n\n      if (this.match(tt.jsxTagStart)) {\n        // Prefer to parse JSX if possible. But may be an arrow fn.\n        state = this.state.clone();\n\n        jsx = this.tryParse(() => super.parseMaybeAssign(...args), state);\n        /*:: invariant(!jsx.aborted) */\n\n        if (!jsx.error) return jsx.node;\n\n        // Remove `tc.j_expr` and `tc.j_oTag` from context added\n        // by parsing `jsxTagStart` to stop the JSX plugin from\n        // messing with the tokens\n        const { context } = this.state;\n        if (context[context.length - 1] === ct.j_oTag) {\n          context.length -= 2;\n        } else if (context[context.length - 1] === ct.j_expr) {\n          context.length -= 1;\n        }\n      }\n\n      if (!(jsx && jsx.error) && !this.isRelational(\"<\")) {\n        return super.parseMaybeAssign(...args);\n      }\n\n      // Either way, we're looking at a '<': tt.jsxTagStart or relational.\n\n      let typeParameters: N.TsTypeParameterDeclaration;\n      state = state || this.state.clone();\n\n      const arrow = this.tryParse(abort => {\n        // This is similar to TypeScript's `tryParseParenthesizedArrowFunctionExpression`.\n        typeParameters = this.tsParseTypeParameters();\n        const expr = super.parseMaybeAssign(...args);\n\n        if (\n          expr.type !== \"ArrowFunctionExpression\" ||\n          (expr.extra && expr.extra.parenthesized)\n        ) {\n          abort();\n        }\n\n        // Correct TypeScript code should have at least 1 type parameter, but don't crash on bad code.\n        if (typeParameters && typeParameters.params.length !== 0) {\n          this.resetStartLocationFromNode(expr, typeParameters);\n        }\n        expr.typeParameters = typeParameters;\n        return expr;\n      }, state);\n\n      if (!arrow.error && !arrow.aborted) return arrow.node;\n\n      if (!jsx) {\n        // Try parsing a type cast instead of an arrow function.\n        // This will never happen outside of JSX.\n        // (Because in JSX the '<' should be a jsxTagStart and not a relational.\n        assert(!this.hasPlugin(\"jsx\"));\n\n        // This will start with a type assertion (via parseMaybeUnary).\n        // But don't directly call `this.tsParseTypeAssertion` because we want to handle any binary after it.\n        typeCast = this.tryParse(() => super.parseMaybeAssign(...args), state);\n        /*:: invariant(!typeCast.aborted) */\n        if (!typeCast.error) return typeCast.node;\n      }\n\n      if (jsx && jsx.node) {\n        /*:: invariant(jsx.failState) */\n        this.state = jsx.failState;\n        return jsx.node;\n      }\n\n      if (arrow.node) {\n        /*:: invariant(arrow.failState) */\n        this.state = arrow.failState;\n        return arrow.node;\n      }\n\n      if (typeCast && typeCast.node) {\n        /*:: invariant(typeCast.failState) */\n        this.state = typeCast.failState;\n        return typeCast.node;\n      }\n\n      if (jsx && jsx.thrown) throw jsx.error;\n      if (arrow.thrown) throw arrow.error;\n      if (typeCast && typeCast.thrown) throw typeCast.error;\n\n      throw (jsx && jsx.error) || arrow.error || (typeCast && typeCast.error);\n    }\n\n    // Handle type assertions\n    parseMaybeUnary(refExpressionErrors?: ?ExpressionErrors): N.Expression {\n      if (!this.hasPlugin(\"jsx\") && this.isRelational(\"<\")) {\n        return this.tsParseTypeAssertion();\n      } else {\n        return super.parseMaybeUnary(refExpressionErrors);\n      }\n    }\n\n    parseArrow(node: N.ArrowFunctionExpression): ?N.ArrowFunctionExpression {\n      if (this.match(tt.colon)) {\n        // This is different from how the TS parser does it.\n        // TS uses lookahead. The Babel Parser parses it as a parenthesized expression and converts.\n\n        const result = this.tryParse(abort => {\n          const returnType = this.tsParseTypeOrTypePredicateAnnotation(\n            tt.colon,\n          );\n          if (this.canInsertSemicolon() || !this.match(tt.arrow)) abort();\n          return returnType;\n        });\n\n        if (result.aborted) return;\n\n        if (!result.thrown) {\n          if (result.error) this.state = result.failState;\n          node.returnType = result.node;\n        }\n      }\n\n      return super.parseArrow(node);\n    }\n\n    // Allow type annotations inside of a parameter list.\n    parseAssignableListItemTypes(param: N.Pattern) {\n      if (this.eat(tt.question)) {\n        if (param.type !== \"Identifier\") {\n          this.raise(param.start, TSErrors.PatternIsOptional);\n        }\n\n        ((param: any): N.Identifier).optional = true;\n      }\n      const type = this.tsTryParseTypeAnnotation();\n      if (type) param.typeAnnotation = type;\n      this.resetEndLocation(param);\n\n      return param;\n    }\n\n    toAssignable(node: N.Node): N.Node {\n      switch (node.type) {\n        case \"TSTypeCastExpression\":\n          return super.toAssignable(this.typeCastToParameter(node));\n        case \"TSParameterProperty\":\n          return super.toAssignable(node);\n        case \"TSAsExpression\":\n        case \"TSNonNullExpression\":\n        case \"TSTypeAssertion\":\n          node.expression = this.toAssignable(node.expression);\n          return node;\n        default:\n          return super.toAssignable(node);\n      }\n    }\n\n    checkLVal(\n      expr: N.Expression,\n      bindingType: BindingTypes = BIND_NONE,\n      checkClashes: ?{ [key: string]: boolean },\n      contextDescription: string,\n    ): void {\n      switch (expr.type) {\n        case \"TSTypeCastExpression\":\n          // Allow \"typecasts\" to appear on the left of assignment expressions,\n          // because it may be in an arrow function.\n          // e.g. `const f = (foo: number = 0) => foo;`\n          return;\n        case \"TSParameterProperty\":\n          this.checkLVal(\n            expr.parameter,\n            bindingType,\n            checkClashes,\n            \"parameter property\",\n          );\n          return;\n        case \"TSAsExpression\":\n        case \"TSNonNullExpression\":\n        case \"TSTypeAssertion\":\n          this.checkLVal(\n            expr.expression,\n            bindingType,\n            checkClashes,\n            contextDescription,\n          );\n          return;\n        default:\n          super.checkLVal(expr, bindingType, checkClashes, contextDescription);\n          return;\n      }\n    }\n\n    parseBindingAtom(): N.Pattern {\n      switch (this.state.type) {\n        case tt._this:\n          // \"this\" may be the name of a parameter, so allow it.\n          return this.parseIdentifier(/* liberal */ true);\n        default:\n          return super.parseBindingAtom();\n      }\n    }\n\n    parseMaybeDecoratorArguments(expr: N.Expression): N.Expression {\n      if (this.isRelational(\"<\")) {\n        const typeArguments = this.tsParseTypeArguments();\n\n        if (this.match(tt.parenL)) {\n          const call = super.parseMaybeDecoratorArguments(expr);\n          call.typeParameters = typeArguments;\n          return call;\n        }\n\n        this.unexpected(this.state.start, tt.parenL);\n      }\n\n      return super.parseMaybeDecoratorArguments(expr);\n    }\n\n    // === === === === === === === === === === === === === === === ===\n    // Note: All below methods are duplicates of something in flow.js.\n    // Not sure what the best way to combine these is.\n    // === === === === === === === === === === === === === === === ===\n\n    isClassMethod(): boolean {\n      return this.isRelational(\"<\") || super.isClassMethod();\n    }\n\n    isClassProperty(): boolean {\n      return (\n        this.match(tt.bang) || this.match(tt.colon) || super.isClassProperty()\n      );\n    }\n\n    parseMaybeDefault(...args): N.Pattern {\n      const node = super.parseMaybeDefault(...args);\n\n      if (\n        node.type === \"AssignmentPattern\" &&\n        node.typeAnnotation &&\n        node.right.start < node.typeAnnotation.start\n      ) {\n        this.raise(\n          node.typeAnnotation.start,\n          TSErrors.TypeAnnotationAfterAssign,\n        );\n      }\n\n      return node;\n    }\n\n    // ensure that inside types, we bypass the jsx parser plugin\n    getTokenFromCode(code: number): void {\n      if (this.state.inType && (code === 62 || code === 60)) {\n        return this.finishOp(tt.relational, 1);\n      } else {\n        return super.getTokenFromCode(code);\n      }\n    }\n\n    toAssignableList(exprList: N.Expression[]): $ReadOnlyArray<N.Pattern> {\n      for (let i = 0; i < exprList.length; i++) {\n        const expr = exprList[i];\n        if (!expr) continue;\n        switch (expr.type) {\n          case \"TSTypeCastExpression\":\n            exprList[i] = this.typeCastToParameter(expr);\n            break;\n          case \"TSAsExpression\":\n          case \"TSTypeAssertion\":\n            if (!this.state.maybeInArrowParameters) {\n              exprList[i] = this.typeCastToParameter(expr);\n            } else {\n              this.raise(expr.start, TSErrors.UnexpectedTypeCastInParameter);\n            }\n            break;\n        }\n      }\n      return super.toAssignableList(...arguments);\n    }\n\n    typeCastToParameter(node: N.TsTypeCastExpression): N.Node {\n      node.expression.typeAnnotation = node.typeAnnotation;\n\n      this.resetEndLocation(\n        node.expression,\n        node.typeAnnotation.end,\n        node.typeAnnotation.loc.end,\n      );\n\n      return node.expression;\n    }\n\n    toReferencedList(\n      exprList: $ReadOnlyArray<?N.Expression>,\n      isInParens?: boolean, // eslint-disable-line no-unused-vars\n    ): $ReadOnlyArray<?N.Expression> {\n      for (let i = 0; i < exprList.length; i++) {\n        const expr = exprList[i];\n        if (expr && expr.type === \"TSTypeCastExpression\") {\n          this.raise(expr.start, TSErrors.UnexpectedTypeAnnotation);\n        }\n      }\n\n      return exprList;\n    }\n\n    shouldParseArrow() {\n      return this.match(tt.colon) || super.shouldParseArrow();\n    }\n\n    shouldParseAsyncArrow(): boolean {\n      return this.match(tt.colon) || super.shouldParseAsyncArrow();\n    }\n\n    canHaveLeadingDecorator() {\n      // Avoid unnecessary lookahead in checking for abstract class unless needed!\n      return super.canHaveLeadingDecorator() || this.isAbstractClass();\n    }\n\n    jsxParseOpeningElementAfterName(\n      node: N.JSXOpeningElement,\n    ): N.JSXOpeningElement {\n      if (this.isRelational(\"<\")) {\n        const typeArguments = this.tsTryParseAndCatch(() =>\n          this.tsParseTypeArguments(),\n        );\n        if (typeArguments) node.typeParameters = typeArguments;\n      }\n      return super.jsxParseOpeningElementAfterName(node);\n    }\n\n    getGetterSetterExpectedParamCount(\n      method: N.ObjectMethod | N.ClassMethod,\n    ): number {\n      const baseCount = super.getGetterSetterExpectedParamCount(method);\n      const firstParam = method.params[0];\n      const hasContextParam =\n        firstParam &&\n        firstParam.type === \"Identifier\" &&\n        firstParam.name === \"this\";\n\n      return hasContextParam ? baseCount + 1 : baseCount;\n    }\n  };\n","// @flow\n\nimport * as charCodes from \"charcodes\";\n\nimport { types as tt, TokenType } from \"../tokenizer/types\";\nimport type Parser from \"../parser\";\nimport * as N from \"../types\";\n\ntt.placeholder = new TokenType(\"%%\", { startsExpr: true });\n\nexport type PlaceholderTypes =\n  | \"Identifier\"\n  | \"StringLiteral\"\n  | \"Expression\"\n  | \"Statement\"\n  | \"Declaration\"\n  | \"BlockStatement\"\n  | \"ClassBody\"\n  | \"Pattern\";\n\n// $PropertyType doesn't support enums. Use a fake \"switch\" (GetPlaceholderNode)\n//type MaybePlaceholder<T: PlaceholderTypes> = $PropertyType<N, T> | N.Placeholder<T>;\n\ntype _Switch<Value, Cases, Index> = $Call<\n  (\n    $ElementType<$ElementType<Cases, Index>, 0>,\n  ) => $ElementType<$ElementType<Cases, Index>, 1>,\n  Value,\n>;\ntype $Switch<Value, Cases> = _Switch<Value, Cases, *>;\n\ntype NodeOf<T: PlaceholderTypes> = $Switch<\n  T,\n  [\n    [\"Identifier\", N.Identifier],\n    [\"StringLiteral\", N.StringLiteral],\n    [\"Expression\", N.Expression],\n    [\"Statement\", N.Statement],\n    [\"Declaration\", N.Declaration],\n    [\"BlockStatement\", N.BlockStatement],\n    [\"ClassBody\", N.ClassBody],\n    [\"Pattern\", N.Pattern],\n  ],\n>;\n\n// Placeholder<T> breaks everything, because its type is incompatible with\n// the substituted nodes.\ntype MaybePlaceholder<T: PlaceholderTypes> = NodeOf<T>; // | Placeholder<T>\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    parsePlaceholder<T: PlaceholderTypes>(\n      expectedNode: T,\n    ): /*?N.Placeholder<T>*/ ?MaybePlaceholder<T> {\n      if (this.match(tt.placeholder)) {\n        const node = this.startNode();\n        this.next();\n        this.assertNoSpace(\"Unexpected space in placeholder.\");\n\n        // We can't use this.parseIdentifier because\n        // we don't want nested placeholders.\n        node.name = super.parseIdentifier(/* liberal */ true);\n\n        this.assertNoSpace(\"Unexpected space in placeholder.\");\n        this.expect(tt.placeholder);\n        return this.finishPlaceholder(node, expectedNode);\n      }\n    }\n\n    finishPlaceholder<T: PlaceholderTypes>(\n      node: N.Node,\n      expectedNode: T,\n    ): /*N.Placeholder<T>*/ MaybePlaceholder<T> {\n      const isFinished = !!(node.expectedNode && node.type === \"Placeholder\");\n      node.expectedNode = expectedNode;\n\n      return isFinished ? node : this.finishNode(node, \"Placeholder\");\n    }\n\n    /* ============================================================ *\n     * tokenizer/index.js                                           *\n     * ============================================================ */\n\n    getTokenFromCode(code: number) {\n      if (\n        code === charCodes.percentSign &&\n        this.input.charCodeAt(this.state.pos + 1) === charCodes.percentSign\n      ) {\n        return this.finishOp(tt.placeholder, 2);\n      }\n\n      return super.getTokenFromCode(...arguments);\n    }\n\n    /* ============================================================ *\n     * parser/expression.js                                         *\n     * ============================================================ */\n\n    parseExprAtom(): MaybePlaceholder<\"Expression\"> {\n      return (\n        this.parsePlaceholder(\"Expression\") || super.parseExprAtom(...arguments)\n      );\n    }\n\n    parseIdentifier(): MaybePlaceholder<\"Identifier\"> {\n      // NOTE: This function only handles identifiers outside of\n      // expressions and binding patterns, since they are already\n      // handled by the parseExprAtom and parseBindingAtom functions.\n      // This is needed, for example, to parse \"class %%NAME%% {}\".\n      return (\n        this.parsePlaceholder(\"Identifier\") ||\n        super.parseIdentifier(...arguments)\n      );\n    }\n\n    checkReservedWord(word: string): void {\n      // Sometimes we call #checkReservedWord(node.name), expecting\n      // that node is an Identifier. If it is a Placeholder, name\n      // will be undefined.\n      if (word !== undefined) super.checkReservedWord(...arguments);\n    }\n\n    /* ============================================================ *\n     * parser/lval.js                                               *\n     * ============================================================ */\n\n    parseBindingAtom(): MaybePlaceholder<\"Pattern\"> {\n      return (\n        this.parsePlaceholder(\"Pattern\") || super.parseBindingAtom(...arguments)\n      );\n    }\n\n    checkLVal(expr: N.Expression): void {\n      if (expr.type !== \"Placeholder\") super.checkLVal(...arguments);\n    }\n\n    toAssignable(node: N.Node): N.Node {\n      if (\n        node &&\n        node.type === \"Placeholder\" &&\n        node.expectedNode === \"Expression\"\n      ) {\n        node.expectedNode = \"Pattern\";\n        return node;\n      }\n      return super.toAssignable(...arguments);\n    }\n\n    /* ============================================================ *\n     * parser/statement.js                                          *\n     * ============================================================ */\n\n    verifyBreakContinue(node: N.BreakStatement | N.ContinueStatement) {\n      if (node.label && node.label.type === \"Placeholder\") return;\n      super.verifyBreakContinue(...arguments);\n    }\n\n    parseExpressionStatement(\n      node: MaybePlaceholder<\"Statement\">,\n      expr: N.Expression,\n    ): MaybePlaceholder<\"Statement\"> {\n      if (\n        expr.type !== \"Placeholder\" ||\n        (expr.extra && expr.extra.parenthesized)\n      ) {\n        return super.parseExpressionStatement(...arguments);\n      }\n\n      if (this.match(tt.colon)) {\n        const stmt: N.LabeledStatement = node;\n        stmt.label = this.finishPlaceholder(expr, \"Identifier\");\n        this.next();\n        stmt.body = this.parseStatement(\"label\");\n        return this.finishNode(stmt, \"LabeledStatement\");\n      }\n\n      this.semicolon();\n\n      node.name = expr.name;\n      return this.finishPlaceholder(node, \"Statement\");\n    }\n\n    parseBlock(): MaybePlaceholder<\"BlockStatement\"> {\n      return (\n        this.parsePlaceholder(\"BlockStatement\") ||\n        super.parseBlock(...arguments)\n      );\n    }\n\n    parseFunctionId(): ?MaybePlaceholder<\"Identifier\"> {\n      return (\n        this.parsePlaceholder(\"Identifier\") ||\n        super.parseFunctionId(...arguments)\n      );\n    }\n\n    parseClass<T: N.Class>(\n      node: T,\n      isStatement: /* T === ClassDeclaration */ boolean,\n      optionalId?: boolean,\n    ): T {\n      const type = isStatement ? \"ClassDeclaration\" : \"ClassExpression\";\n\n      this.next();\n      this.takeDecorators(node);\n\n      const placeholder = this.parsePlaceholder(\"Identifier\");\n      if (placeholder) {\n        if (\n          this.match(tt._extends) ||\n          this.match(tt.placeholder) ||\n          this.match(tt.braceL)\n        ) {\n          node.id = placeholder;\n        } else if (optionalId || !isStatement) {\n          node.id = null;\n          node.body = this.finishPlaceholder(placeholder, \"ClassBody\");\n          return this.finishNode(node, type);\n        } else {\n          this.unexpected(null, \"A class name is required\");\n        }\n      } else {\n        this.parseClassId(node, isStatement, optionalId);\n      }\n\n      this.parseClassSuper(node);\n      node.body =\n        this.parsePlaceholder(\"ClassBody\") ||\n        this.parseClassBody(!!node.superClass);\n      return this.finishNode(node, type);\n    }\n\n    parseExport(node: N.Node): N.Node {\n      const placeholder = this.parsePlaceholder(\"Identifier\");\n      if (!placeholder) return super.parseExport(...arguments);\n\n      if (!this.isContextual(\"from\") && !this.match(tt.comma)) {\n        // export %%DECL%%;\n        node.specifiers = [];\n        node.source = null;\n        node.declaration = this.finishPlaceholder(placeholder, \"Declaration\");\n        return this.finishNode(node, \"ExportNamedDeclaration\");\n      }\n\n      // export %%NAME%% from \"foo\";\n      this.expectPlugin(\"exportDefaultFrom\");\n      const specifier = this.startNode();\n      specifier.exported = placeholder;\n      node.specifiers = [this.finishNode(specifier, \"ExportDefaultSpecifier\")];\n\n      return super.parseExport(node);\n    }\n\n    maybeParseExportDefaultSpecifier(node: N.Node): boolean {\n      if (node.specifiers && node.specifiers.length > 0) {\n        // \"export %%NAME%%\" has already been parsed by #parseExport.\n        return true;\n      }\n      return super.maybeParseExportDefaultSpecifier(...arguments);\n    }\n\n    checkExport(node: N.ExportNamedDeclaration): void {\n      const { specifiers } = node;\n      if (specifiers && specifiers.length) {\n        node.specifiers = specifiers.filter(\n          node => node.exported.type === \"Placeholder\",\n        );\n      }\n      super.checkExport(node);\n      node.specifiers = specifiers;\n    }\n\n    parseImport(\n      node: N.Node,\n    ): N.ImportDeclaration | N.TsImportEqualsDeclaration {\n      const placeholder = this.parsePlaceholder(\"Identifier\");\n      if (!placeholder) return super.parseImport(...arguments);\n\n      node.specifiers = [];\n\n      if (!this.isContextual(\"from\") && !this.match(tt.comma)) {\n        // import %%STRING%%;\n        node.source = this.finishPlaceholder(placeholder, \"StringLiteral\");\n        this.semicolon();\n        return this.finishNode(node, \"ImportDeclaration\");\n      }\n\n      // import %%DEFAULT%% ...\n      const specifier = this.startNodeAtNode(placeholder);\n      specifier.local = placeholder;\n      this.finishNode(specifier, \"ImportDefaultSpecifier\");\n      node.specifiers.push(specifier);\n\n      if (this.eat(tt.comma)) {\n        // import %%DEFAULT%%, * as ...\n        const hasStarImport = this.maybeParseStarImportSpecifier(node);\n\n        // import %%DEFAULT%%, { ...\n        if (!hasStarImport) this.parseNamedImportSpecifiers(node);\n      }\n\n      this.expectContextual(\"from\");\n      node.source = this.parseImportSource();\n      this.semicolon();\n      return this.finishNode(node, \"ImportDeclaration\");\n    }\n\n    parseImportSource(): MaybePlaceholder<\"StringLiteral\"> {\n      // import ... from %%STRING%%;\n\n      return (\n        this.parsePlaceholder(\"StringLiteral\") ||\n        super.parseImportSource(...arguments)\n      );\n    }\n  };\n","import type Parser from \"../parser\";\nimport { types as tt } from \"../tokenizer/types\";\nimport * as N from \"../types\";\n\nexport default (superClass: Class<Parser>): Class<Parser> =>\n  class extends superClass {\n    parseV8Intrinsic(): N.Expression {\n      if (this.match(tt.modulo)) {\n        const v8IntrinsicStart = this.state.start;\n        // let the `loc` of Identifier starts from `%`\n        const node = this.startNode();\n        this.eat(tt.modulo);\n        if (this.match(tt.name)) {\n          const name = this.parseIdentifierName(this.state.start);\n          const identifier = this.createIdentifier(node, name);\n          identifier.type = \"V8IntrinsicIdentifier\";\n          if (this.match(tt.parenL)) {\n            return identifier;\n          }\n        }\n        this.unexpected(v8IntrinsicStart);\n      }\n    }\n\n    /* ============================================================ *\n     * parser/expression.js                                         *\n     * ============================================================ */\n\n    parseExprAtom(): N.Expression {\n      return this.parseV8Intrinsic() || super.parseExprAtom(...arguments);\n    }\n  };\n","// @flow\n\nimport type Parser from \"./parser\";\n\nexport type Plugin = string | [string, Object];\n\nexport type PluginList = $ReadOnlyArray<Plugin>;\n\nexport type MixinPlugin = (superClass: Class<Parser>) => Class<Parser>;\n\nexport function hasPlugin(plugins: PluginList, name: string): boolean {\n  return plugins.some(plugin => {\n    if (Array.isArray(plugin)) {\n      return plugin[0] === name;\n    } else {\n      return plugin === name;\n    }\n  });\n}\n\nexport function getPluginOption(\n  plugins: PluginList,\n  name: string,\n  option: string,\n) {\n  const plugin = plugins.find(plugin => {\n    if (Array.isArray(plugin)) {\n      return plugin[0] === name;\n    } else {\n      return plugin === name;\n    }\n  });\n\n  if (plugin && Array.isArray(plugin)) {\n    return plugin[1][option];\n  }\n\n  return null;\n}\n\nconst PIPELINE_PROPOSALS = [\"minimal\", \"smart\", \"fsharp\"];\nconst RECORD_AND_TUPLE_SYNTAX_TYPES = [\"hash\", \"bar\"];\n\nexport function validatePlugins(plugins: PluginList) {\n  if (hasPlugin(plugins, \"decorators\")) {\n    if (hasPlugin(plugins, \"decorators-legacy\")) {\n      throw new Error(\n        \"Cannot use the decorators and decorators-legacy plugin together\",\n      );\n    }\n\n    const decoratorsBeforeExport = getPluginOption(\n      plugins,\n      \"decorators\",\n      \"decoratorsBeforeExport\",\n    );\n    if (decoratorsBeforeExport == null) {\n      throw new Error(\n        \"The 'decorators' plugin requires a 'decoratorsBeforeExport' option,\" +\n          \" whose value must be a boolean. If you are migrating from\" +\n          \" Babylon/Babel 6 or want to use the old decorators proposal, you\" +\n          \" should use the 'decorators-legacy' plugin instead of 'decorators'.\",\n      );\n    } else if (typeof decoratorsBeforeExport !== \"boolean\") {\n      throw new Error(\"'decoratorsBeforeExport' must be a boolean.\");\n    }\n  }\n\n  if (hasPlugin(plugins, \"flow\") && hasPlugin(plugins, \"typescript\")) {\n    throw new Error(\"Cannot combine flow and typescript plugins.\");\n  }\n\n  if (hasPlugin(plugins, \"placeholders\") && hasPlugin(plugins, \"v8intrinsic\")) {\n    throw new Error(\"Cannot combine placeholders and v8intrinsic plugins.\");\n  }\n\n  if (\n    hasPlugin(plugins, \"pipelineOperator\") &&\n    !PIPELINE_PROPOSALS.includes(\n      getPluginOption(plugins, \"pipelineOperator\", \"proposal\"),\n    )\n  ) {\n    throw new Error(\n      \"'pipelineOperator' requires 'proposal' option whose value should be one of: \" +\n        PIPELINE_PROPOSALS.map(p => `'${p}'`).join(\", \"),\n    );\n  }\n\n  if (\n    hasPlugin(plugins, \"recordAndTuple\") &&\n    !RECORD_AND_TUPLE_SYNTAX_TYPES.includes(\n      getPluginOption(plugins, \"recordAndTuple\", \"syntaxType\"),\n    )\n  ) {\n    throw new Error(\n      \"'recordAndTuple' requires 'syntaxType' option whose value should be one of: \" +\n        RECORD_AND_TUPLE_SYNTAX_TYPES.map(p => `'${p}'`).join(\", \"),\n    );\n  }\n}\n\n// These plugins are defined using a mixin which extends the parser class.\n\nimport estree from \"./plugins/estree\";\nimport flow from \"./plugins/flow\";\nimport jsx from \"./plugins/jsx\";\nimport typescript from \"./plugins/typescript\";\nimport placeholders from \"./plugins/placeholders\";\nimport v8intrinsic from \"./plugins/v8intrinsic\";\n\n// NOTE: order is important. estree must come first; placeholders must come last.\nexport const mixinPlugins: { [name: string]: MixinPlugin } = {\n  estree,\n  jsx,\n  flow,\n  typescript,\n  v8intrinsic,\n  placeholders,\n};\n\nexport const mixinPluginNames: $ReadOnlyArray<string> = Object.keys(\n  mixinPlugins,\n);\n","// @flow\n\nimport type { PluginList } from \"./plugin-utils\";\n\n// A second optional argument can be given to further configure\n// the parser process. These options are recognized:\n\nexport type SourceType = \"script\" | \"module\" | \"unambiguous\";\n\nexport type Options = {\n  sourceType: SourceType,\n  sourceFilename?: string,\n  startLine: number,\n  allowAwaitOutsideFunction: boolean,\n  allowReturnOutsideFunction: boolean,\n  allowImportExportEverywhere: boolean,\n  allowSuperOutsideMethod: boolean,\n  allowUndeclaredExports: boolean,\n  plugins: PluginList,\n  strictMode: ?boolean,\n  ranges: boolean,\n  tokens: boolean,\n  createParenthesizedExpressions: boolean,\n  errorRecovery: boolean,\n};\n\nexport const defaultOptions: Options = {\n  // Source type (\"script\" or \"module\") for different semantics\n  sourceType: \"script\",\n  // Source filename.\n  sourceFilename: undefined,\n  // Line from which to start counting source. Useful for\n  // integration with other tools.\n  startLine: 1,\n  // When enabled, await at the top level is not considered an\n  // error.\n  allowAwaitOutsideFunction: false,\n  // When enabled, a return at the top level is not considered an\n  // error.\n  allowReturnOutsideFunction: false,\n  // When enabled, import/export statements are not constrained to\n  // appearing at the top of the program.\n  allowImportExportEverywhere: false,\n  // TODO\n  allowSuperOutsideMethod: false,\n  // When enabled, export statements can reference undeclared variables.\n  allowUndeclaredExports: false,\n  // An array of plugins to enable\n  plugins: [],\n  // TODO\n  strictMode: null,\n  // Nodes have their start and end characters offsets recorded in\n  // `start` and `end` properties (directly on the node, rather than\n  // the `loc` object, which holds line/column data. To also add a\n  // [semi-standardized][range] `range` property holding a `[start,\n  // end]` array with the same numbers, set the `ranges` option to\n  // `true`.\n  //\n  // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678\n  ranges: false,\n  // Adds all parsed tokens to a `tokens` property on the `File` node\n  tokens: false,\n  // Whether to create ParenthesizedExpression AST nodes (if false\n  // the parser sets extra.parenthesized on the expression nodes instead).\n  createParenthesizedExpressions: false,\n  // When enabled, errors are attached to the AST instead of being directly thrown.\n  // Some errors will still throw, because @babel/parser can't always recover.\n  errorRecovery: false,\n};\n\n// Interpret and default an options object\n\nexport function getOptions(opts: ?Options): Options {\n  const options: any = {};\n  for (const key of Object.keys(defaultOptions)) {\n    options[key] = opts && opts[key] != null ? opts[key] : defaultOptions[key];\n  }\n  return options;\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport * as N from \"../types\";\nimport { Position } from \"../util/location\";\n\nimport { types as ct, type TokContext } from \"./context\";\nimport { types as tt, type TokenType } from \"./types\";\n\ntype TopicContextState = {\n  // When a topic binding has been currently established,\n  // then this is 1. Otherwise, it is 0. This is forwards compatible\n  // with a future plugin for multiple lexical topics.\n  maxNumOfResolvableTopics: number,\n\n  // When a topic binding has been currently established, and if that binding\n  // has been used as a topic reference `#`, then this is 0. Otherwise, it is\n  // `null`. This is forwards compatible with a future plugin for multiple\n  // lexical topics.\n  maxTopicIndex: null | 0,\n};\n\nexport default class State {\n  strict: boolean;\n  curLine: number;\n\n  // And, if locations are used, the {line, column} object\n  // corresponding to those offsets\n  startLoc: Position;\n  endLoc: Position;\n\n  init(options: Options): void {\n    this.strict =\n      options.strictMode === false ? false : options.sourceType === \"module\";\n\n    this.curLine = options.startLine;\n    this.startLoc = this.endLoc = this.curPosition();\n  }\n\n  errors: SyntaxError[] = [];\n\n  // Used to signify the start of a potential arrow function\n  potentialArrowAt: number = -1;\n\n  // Used to signify the start of an expression which looks like a\n  // typed arrow function, but it isn't\n  // e.g. a ? (b) : c => d\n  //          ^\n  noArrowAt: number[] = [];\n\n  // Used to signify the start of an expression whose params, if it looks like\n  // an arrow function, shouldn't be converted to assignable nodes.\n  // This is used to defer the validation of typed arrow functions inside\n  // conditional expressions.\n  // e.g. a ? (b) : c => d\n  //          ^\n  noArrowParamsConversionAt: number[] = [];\n\n  // Flags to track\n  inParameters: boolean = false;\n  maybeInArrowParameters: boolean = false;\n  // This flag is used to track async arrow head across function declarations.\n  // e.g. async (foo = function (await) {}) => {}\n  // When parsing `await` in this expression, `maybeInAsyncArrowHead` is true\n  // but `maybeInArrowParameters` is false\n  maybeInAsyncArrowHead: boolean = false;\n  inPipeline: boolean = false;\n  inType: boolean = false;\n  noAnonFunctionType: boolean = false;\n  inPropertyName: boolean = false;\n  hasFlowComment: boolean = false;\n  isIterator: boolean = false;\n\n  // For the smartPipelines plugin:\n  topicContext: TopicContextState = {\n    maxNumOfResolvableTopics: 0,\n    maxTopicIndex: null,\n  };\n\n  // For the F# plugin\n  soloAwait: boolean = false;\n  inFSharpPipelineDirectBody: boolean = false;\n\n  // Labels in scope.\n  labels: Array<{\n    kind: ?(\"loop\" | \"switch\"),\n    name?: ?string,\n    statementStart?: number,\n  }> = [];\n\n  // Leading decorators. Last element of the stack represents the decorators in current context.\n  // Supports nesting of decorators, e.g. @foo(@bar class inner {}) class outer {}\n  // where @foo belongs to the outer class and @bar to the inner\n  decoratorStack: Array<Array<N.Decorator>> = [[]];\n\n  // Positions to delayed-check that yield/await does not exist in default parameters.\n  yieldPos: number = -1;\n  awaitPos: number = -1;\n\n  // Comment store.\n  comments: Array<N.Comment> = [];\n\n  // Comment attachment store\n  trailingComments: Array<N.Comment> = [];\n  leadingComments: Array<N.Comment> = [];\n  commentStack: Array<{\n    start: number,\n    leadingComments: ?Array<N.Comment>,\n    trailingComments: ?Array<N.Comment>,\n    type: string,\n  }> = [];\n  // $FlowIgnore this is initialized when the parser starts.\n  commentPreviousNode: N.Node = null;\n\n  // The current position of the tokenizer in the input.\n  pos: number = 0;\n  lineStart: number = 0;\n\n  // Properties of the current token:\n  // Its type\n  type: TokenType = tt.eof;\n\n  // For tokens that include more information than their type, the value\n  value: any = null;\n\n  // Its start and end offset\n  start: number = 0;\n  end: number = 0;\n\n  // Position information for the previous token\n  // $FlowIgnore this is initialized when generating the second token.\n  lastTokEndLoc: Position = null;\n  // $FlowIgnore this is initialized when generating the second token.\n  lastTokStartLoc: Position = null;\n  lastTokStart: number = 0;\n  lastTokEnd: number = 0;\n\n  // The context stack is used to superficially track syntactic\n  // context to predict whether a regular expression is allowed in a\n  // given position.\n  context: Array<TokContext> = [ct.braceStatement];\n  exprAllowed: boolean = true;\n\n  // Used to signal to callers of `readWord1` whether the word\n  // contained any escape sequences. This is needed because words with\n  // escape sequences must not be interpreted as keywords.\n  containsEsc: boolean = false;\n\n  // This property is used to throw an error for\n  // an octal literal in a directive that occurs prior\n  // to a \"use strict\" directive.\n  octalPositions: number[] = [];\n\n  // Names of exports store. `default` is stored as a name for both\n  // `export default foo;` and `export { foo as default };`.\n  exportedIdentifiers: Array<string> = [];\n\n  // Tokens length in token store\n  tokensLength: number = 0;\n\n  curPosition(): Position {\n    return new Position(this.curLine, this.pos - this.lineStart);\n  }\n\n  clone(skipArrays?: boolean): State {\n    const state = new State();\n    const keys = Object.keys(this);\n    for (let i = 0, length = keys.length; i < length; i++) {\n      const key = keys[i];\n      // $FlowIgnore\n      let val = this[key];\n\n      if (!skipArrays && Array.isArray(val)) {\n        val = val.slice();\n      }\n\n      // $FlowIgnore\n      state[key] = val;\n    }\n\n    return state;\n  }\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport * as N from \"../types\";\nimport type { Position } from \"../util/location\";\nimport * as charCodes from \"charcodes\";\nimport { isIdentifierStart, isIdentifierChar } from \"../util/identifier\";\nimport { types as tt, keywords as keywordTypes, type TokenType } from \"./types\";\nimport { type TokContext, types as ct } from \"./context\";\nimport LocationParser, { Errors } from \"../parser/location\";\nimport { SourceLocation } from \"../util/location\";\nimport {\n  lineBreak,\n  lineBreakG,\n  isNewLine,\n  isWhitespace,\n  skipWhiteSpace,\n} from \"../util/whitespace\";\nimport State from \"./state\";\n\nconst VALID_REGEX_FLAGS = new Set([\"g\", \"m\", \"s\", \"i\", \"y\", \"u\"]);\n\n// The following character codes are forbidden from being\n// an immediate sibling of NumericLiteralSeparator _\n\nconst forbiddenNumericSeparatorSiblings = {\n  decBinOct: [\n    charCodes.dot,\n    charCodes.uppercaseB,\n    charCodes.uppercaseE,\n    charCodes.uppercaseO,\n    charCodes.underscore, // multiple separators are not allowed\n    charCodes.lowercaseB,\n    charCodes.lowercaseE,\n    charCodes.lowercaseO,\n  ],\n  hex: [\n    charCodes.dot,\n    charCodes.uppercaseX,\n    charCodes.underscore, // multiple separators are not allowed\n    charCodes.lowercaseX,\n  ],\n};\n\nconst allowedNumericSeparatorSiblings = {};\nallowedNumericSeparatorSiblings.bin = [\n  // 0 - 1\n  charCodes.digit0,\n  charCodes.digit1,\n];\nallowedNumericSeparatorSiblings.oct = [\n  // 0 - 7\n  ...allowedNumericSeparatorSiblings.bin,\n\n  charCodes.digit2,\n  charCodes.digit3,\n  charCodes.digit4,\n  charCodes.digit5,\n  charCodes.digit6,\n  charCodes.digit7,\n];\nallowedNumericSeparatorSiblings.dec = [\n  // 0 - 9\n  ...allowedNumericSeparatorSiblings.oct,\n\n  charCodes.digit8,\n  charCodes.digit9,\n];\n\nallowedNumericSeparatorSiblings.hex = [\n  // 0 - 9, A - F, a - f,\n  ...allowedNumericSeparatorSiblings.dec,\n\n  charCodes.uppercaseA,\n  charCodes.uppercaseB,\n  charCodes.uppercaseC,\n  charCodes.uppercaseD,\n  charCodes.uppercaseE,\n  charCodes.uppercaseF,\n\n  charCodes.lowercaseA,\n  charCodes.lowercaseB,\n  charCodes.lowercaseC,\n  charCodes.lowercaseD,\n  charCodes.lowercaseE,\n  charCodes.lowercaseF,\n];\n\n// Object type used to represent tokens. Note that normally, tokens\n// simply exist as properties on the parser object. This is only\n// used for the onToken callback and the external tokenizer.\n\nexport class Token {\n  constructor(state: State) {\n    this.type = state.type;\n    this.value = state.value;\n    this.start = state.start;\n    this.end = state.end;\n    this.loc = new SourceLocation(state.startLoc, state.endLoc);\n  }\n\n  type: TokenType;\n  value: any;\n  start: number;\n  end: number;\n  loc: SourceLocation;\n}\n\n// ## Tokenizer\n\nexport default class Tokenizer extends LocationParser {\n  // Forward-declarations\n  // parser/util.js\n  /*::\n  +unexpected: (pos?: ?number, messageOrType?: string | TokenType) => empty;\n  */\n\n  isLookahead: boolean;\n\n  // Token store.\n  tokens: Array<Token | N.Comment> = [];\n\n  constructor(options: Options, input: string) {\n    super();\n    this.state = new State();\n    this.state.init(options);\n    this.input = input;\n    this.length = input.length;\n    this.isLookahead = false;\n  }\n\n  pushToken(token: Token | N.Comment) {\n    // Pop out invalid tokens trapped by try-catch parsing.\n    // Those parsing branches are mainly created by typescript and flow plugins.\n    this.tokens.length = this.state.tokensLength;\n    this.tokens.push(token);\n    ++this.state.tokensLength;\n  }\n\n  // Move to the next token\n\n  next(): void {\n    if (!this.isLookahead) {\n      this.checkKeywordEscapes();\n      if (this.options.tokens) {\n        this.pushToken(new Token(this.state));\n      }\n    }\n\n    this.state.lastTokEnd = this.state.end;\n    this.state.lastTokStart = this.state.start;\n    this.state.lastTokEndLoc = this.state.endLoc;\n    this.state.lastTokStartLoc = this.state.startLoc;\n    this.nextToken();\n  }\n\n  // TODO\n\n  eat(type: TokenType): boolean {\n    if (this.match(type)) {\n      this.next();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  // TODO\n\n  match(type: TokenType): boolean {\n    return this.state.type === type;\n  }\n\n  // TODO\n\n  lookahead(): State {\n    const old = this.state;\n    this.state = old.clone(true);\n\n    this.isLookahead = true;\n    this.next();\n    this.isLookahead = false;\n\n    const curr = this.state;\n    this.state = old;\n    return curr;\n  }\n\n  nextTokenStart(): number {\n    const thisTokEnd = this.state.pos;\n    skipWhiteSpace.lastIndex = thisTokEnd;\n    const skip = skipWhiteSpace.exec(this.input);\n    // $FlowIgnore: The skipWhiteSpace ensures to match any string\n    return thisTokEnd + skip[0].length;\n  }\n\n  lookaheadCharCode(): number {\n    return this.input.charCodeAt(this.nextTokenStart());\n  }\n\n  // Toggle strict mode. Re-reads the next number or string to please\n  // pedantic tests (`\"use strict\"; 010;` should fail).\n\n  setStrict(strict: boolean): void {\n    this.state.strict = strict;\n    if (!this.match(tt.num) && !this.match(tt.string)) return;\n    this.state.pos = this.state.start;\n    while (this.state.pos < this.state.lineStart) {\n      this.state.lineStart =\n        this.input.lastIndexOf(\"\\n\", this.state.lineStart - 2) + 1;\n      --this.state.curLine;\n    }\n    this.nextToken();\n  }\n\n  curContext(): TokContext {\n    return this.state.context[this.state.context.length - 1];\n  }\n\n  // Read a single token, updating the parser object's token-related\n  // properties.\n\n  nextToken(): void {\n    const curContext = this.curContext();\n    if (!curContext || !curContext.preserveSpace) this.skipSpace();\n\n    this.state.octalPositions = [];\n    this.state.start = this.state.pos;\n    this.state.startLoc = this.state.curPosition();\n    if (this.state.pos >= this.length) {\n      this.finishToken(tt.eof);\n      return;\n    }\n\n    const override = curContext?.override;\n    if (override) {\n      override(this);\n    } else {\n      this.getTokenFromCode(this.input.codePointAt(this.state.pos));\n    }\n  }\n\n  pushComment(\n    block: boolean,\n    text: string,\n    start: number,\n    end: number,\n    startLoc: Position,\n    endLoc: Position,\n  ): void {\n    const comment = {\n      type: block ? \"CommentBlock\" : \"CommentLine\",\n      value: text,\n      start: start,\n      end: end,\n      loc: new SourceLocation(startLoc, endLoc),\n    };\n\n    if (this.options.tokens) this.pushToken(comment);\n    this.state.comments.push(comment);\n    this.addComment(comment);\n  }\n\n  skipBlockComment(): void {\n    const startLoc = this.state.curPosition();\n    const start = this.state.pos;\n    const end = this.input.indexOf(\"*/\", this.state.pos + 2);\n    if (end === -1) throw this.raise(start, Errors.UnterminatedComment);\n\n    this.state.pos = end + 2;\n    lineBreakG.lastIndex = start;\n    let match;\n    while (\n      (match = lineBreakG.exec(this.input)) &&\n      match.index < this.state.pos\n    ) {\n      ++this.state.curLine;\n      this.state.lineStart = match.index + match[0].length;\n    }\n\n    // If we are doing a lookahead right now we need to advance the position (above code)\n    // but we do not want to push the comment to the state.\n    if (this.isLookahead) return;\n\n    this.pushComment(\n      true,\n      this.input.slice(start + 2, end),\n      start,\n      this.state.pos,\n      startLoc,\n      this.state.curPosition(),\n    );\n  }\n\n  skipLineComment(startSkip: number): void {\n    const start = this.state.pos;\n    const startLoc = this.state.curPosition();\n    let ch = this.input.charCodeAt((this.state.pos += startSkip));\n    if (this.state.pos < this.length) {\n      while (!isNewLine(ch) && ++this.state.pos < this.length) {\n        ch = this.input.charCodeAt(this.state.pos);\n      }\n    }\n\n    // If we are doing a lookahead right now we need to advance the position (above code)\n    // but we do not want to push the comment to the state.\n    if (this.isLookahead) return;\n\n    this.pushComment(\n      false,\n      this.input.slice(start + startSkip, this.state.pos),\n      start,\n      this.state.pos,\n      startLoc,\n      this.state.curPosition(),\n    );\n  }\n\n  // Called at the start of the parse and after every token. Skips\n  // whitespace and comments, and.\n\n  skipSpace(): void {\n    loop: while (this.state.pos < this.length) {\n      const ch = this.input.charCodeAt(this.state.pos);\n      switch (ch) {\n        case charCodes.space:\n        case charCodes.nonBreakingSpace:\n        case charCodes.tab:\n          ++this.state.pos;\n          break;\n        case charCodes.carriageReturn:\n          if (\n            this.input.charCodeAt(this.state.pos + 1) === charCodes.lineFeed\n          ) {\n            ++this.state.pos;\n          }\n        // fall through\n        case charCodes.lineFeed:\n        case charCodes.lineSeparator:\n        case charCodes.paragraphSeparator:\n          ++this.state.pos;\n          ++this.state.curLine;\n          this.state.lineStart = this.state.pos;\n          break;\n\n        case charCodes.slash:\n          switch (this.input.charCodeAt(this.state.pos + 1)) {\n            case charCodes.asterisk:\n              this.skipBlockComment();\n              break;\n\n            case charCodes.slash:\n              this.skipLineComment(2);\n              break;\n\n            default:\n              break loop;\n          }\n          break;\n\n        default:\n          if (isWhitespace(ch)) {\n            ++this.state.pos;\n          } else {\n            break loop;\n          }\n      }\n    }\n  }\n\n  // Called at the end of every token. Sets `end`, `val`, and\n  // maintains `context` and `exprAllowed`, and skips the space after\n  // the token, so that the next one's `start` will point at the\n  // right position.\n\n  finishToken(type: TokenType, val: any): void {\n    this.state.end = this.state.pos;\n    this.state.endLoc = this.state.curPosition();\n    const prevType = this.state.type;\n    this.state.type = type;\n    this.state.value = val;\n\n    if (!this.isLookahead) this.updateContext(prevType);\n  }\n\n  // ### Token reading\n\n  // This is the function that is called to fetch the next token. It\n  // is somewhat obscure, because it works in character codes rather\n  // than characters, and because operator parsing has been inlined\n  // into it.\n  //\n  // All in the name of speed.\n\n  // number sign is \"#\"\n  readToken_numberSign(): void {\n    if (this.state.pos === 0 && this.readToken_interpreter()) {\n      return;\n    }\n\n    const nextPos = this.state.pos + 1;\n    const next = this.input.charCodeAt(nextPos);\n    if (next >= charCodes.digit0 && next <= charCodes.digit9) {\n      throw this.raise(this.state.pos, Errors.UnexpectedDigitAfterHash);\n    }\n\n    if (\n      this.hasPlugin(\"recordAndTuple\") &&\n      (next === charCodes.leftCurlyBrace ||\n        next === charCodes.leftSquareBracket)\n    ) {\n      if (this.getPluginOption(\"recordAndTuple\", \"syntaxType\") !== \"hash\") {\n        throw this.raise(\n          this.state.pos,\n          next === charCodes.leftCurlyBrace\n            ? Errors.RecordExpressionHashIncorrectStartSyntaxType\n            : Errors.TupleExpressionHashIncorrectStartSyntaxType,\n        );\n      }\n\n      if (next === charCodes.leftCurlyBrace) {\n        // #{\n        this.finishToken(tt.braceHashL);\n      } else {\n        // #[\n        this.finishToken(tt.bracketHashL);\n      }\n      this.state.pos += 2;\n    } else if (\n      this.hasPlugin(\"classPrivateProperties\") ||\n      this.hasPlugin(\"classPrivateMethods\") ||\n      this.getPluginOption(\"pipelineOperator\", \"proposal\") === \"smart\"\n    ) {\n      this.finishOp(tt.hash, 1);\n    } else {\n      throw this.raise(this.state.pos, Errors.InvalidOrUnexpectedToken, \"#\");\n    }\n  }\n\n  readToken_dot(): void {\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    if (next >= charCodes.digit0 && next <= charCodes.digit9) {\n      this.readNumber(true);\n      return;\n    }\n\n    if (\n      next === charCodes.dot &&\n      this.input.charCodeAt(this.state.pos + 2) === charCodes.dot\n    ) {\n      this.state.pos += 3;\n      this.finishToken(tt.ellipsis);\n    } else {\n      ++this.state.pos;\n      this.finishToken(tt.dot);\n    }\n  }\n\n  readToken_slash(): void {\n    // '/'\n    if (this.state.exprAllowed && !this.state.inType) {\n      ++this.state.pos;\n      this.readRegexp();\n      return;\n    }\n\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    if (next === charCodes.equalsTo) {\n      this.finishOp(tt.assign, 2);\n    } else {\n      this.finishOp(tt.slash, 1);\n    }\n  }\n\n  readToken_interpreter(): boolean {\n    if (this.state.pos !== 0 || this.length < 2) return false;\n\n    let ch = this.input.charCodeAt(this.state.pos + 1);\n    if (ch !== charCodes.exclamationMark) return false;\n\n    const start = this.state.pos;\n    this.state.pos += 1;\n\n    while (!isNewLine(ch) && ++this.state.pos < this.length) {\n      ch = this.input.charCodeAt(this.state.pos);\n    }\n\n    const value = this.input.slice(start + 2, this.state.pos);\n\n    this.finishToken(tt.interpreterDirective, value);\n\n    return true;\n  }\n\n  readToken_mult_modulo(code: number): void {\n    // '%*'\n    let type = code === charCodes.asterisk ? tt.star : tt.modulo;\n    let width = 1;\n    let next = this.input.charCodeAt(this.state.pos + 1);\n    const exprAllowed = this.state.exprAllowed;\n\n    // Exponentiation operator **\n    if (code === charCodes.asterisk && next === charCodes.asterisk) {\n      width++;\n      next = this.input.charCodeAt(this.state.pos + 2);\n      type = tt.exponent;\n    }\n\n    if (next === charCodes.equalsTo && !exprAllowed) {\n      width++;\n      type = tt.assign;\n    }\n\n    this.finishOp(type, width);\n  }\n\n  readToken_pipe_amp(code: number): void {\n    // '||' '&&' '||=' '&&='\n    const next = this.input.charCodeAt(this.state.pos + 1);\n\n    if (next === code) {\n      if (this.input.charCodeAt(this.state.pos + 2) === charCodes.equalsTo) {\n        this.finishOp(tt.assign, 3);\n      } else {\n        this.finishOp(\n          code === charCodes.verticalBar ? tt.logicalOR : tt.logicalAND,\n          2,\n        );\n      }\n      return;\n    }\n\n    if (code === charCodes.verticalBar) {\n      // '|>'\n      if (next === charCodes.greaterThan) {\n        this.finishOp(tt.pipeline, 2);\n        return;\n      }\n      // '|}'\n      if (\n        this.hasPlugin(\"recordAndTuple\") &&\n        next === charCodes.rightCurlyBrace\n      ) {\n        if (this.getPluginOption(\"recordAndTuple\", \"syntaxType\") !== \"bar\") {\n          throw this.raise(\n            this.state.pos,\n            Errors.RecordExpressionBarIncorrectEndSyntaxType,\n          );\n        }\n\n        this.finishOp(tt.braceBarR, 2);\n        return;\n      }\n\n      // '|]'\n      if (\n        this.hasPlugin(\"recordAndTuple\") &&\n        next === charCodes.rightSquareBracket\n      ) {\n        if (this.getPluginOption(\"recordAndTuple\", \"syntaxType\") !== \"bar\") {\n          throw this.raise(\n            this.state.pos,\n            Errors.TupleExpressionBarIncorrectEndSyntaxType,\n          );\n        }\n\n        this.finishOp(tt.bracketBarR, 2);\n        return;\n      }\n    }\n\n    if (next === charCodes.equalsTo) {\n      this.finishOp(tt.assign, 2);\n      return;\n    }\n\n    this.finishOp(\n      code === charCodes.verticalBar ? tt.bitwiseOR : tt.bitwiseAND,\n      1,\n    );\n  }\n\n  readToken_caret(): void {\n    // '^'\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    if (next === charCodes.equalsTo) {\n      this.finishOp(tt.assign, 2);\n    } else {\n      this.finishOp(tt.bitwiseXOR, 1);\n    }\n  }\n\n  readToken_plus_min(code: number): void {\n    // '+-'\n    const next = this.input.charCodeAt(this.state.pos + 1);\n\n    if (next === code) {\n      if (\n        next === charCodes.dash &&\n        !this.inModule &&\n        this.input.charCodeAt(this.state.pos + 2) === charCodes.greaterThan &&\n        (this.state.lastTokEnd === 0 ||\n          lineBreak.test(\n            this.input.slice(this.state.lastTokEnd, this.state.pos),\n          ))\n      ) {\n        // A `-->` line comment\n        this.skipLineComment(3);\n        this.skipSpace();\n        this.nextToken();\n        return;\n      }\n      this.finishOp(tt.incDec, 2);\n      return;\n    }\n\n    if (next === charCodes.equalsTo) {\n      this.finishOp(tt.assign, 2);\n    } else {\n      this.finishOp(tt.plusMin, 1);\n    }\n  }\n\n  readToken_lt_gt(code: number): void {\n    // '<>'\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    let size = 1;\n\n    if (next === code) {\n      size =\n        code === charCodes.greaterThan &&\n        this.input.charCodeAt(this.state.pos + 2) === charCodes.greaterThan\n          ? 3\n          : 2;\n      if (this.input.charCodeAt(this.state.pos + size) === charCodes.equalsTo) {\n        this.finishOp(tt.assign, size + 1);\n        return;\n      }\n      this.finishOp(tt.bitShift, size);\n      return;\n    }\n\n    if (\n      next === charCodes.exclamationMark &&\n      code === charCodes.lessThan &&\n      !this.inModule &&\n      this.input.charCodeAt(this.state.pos + 2) === charCodes.dash &&\n      this.input.charCodeAt(this.state.pos + 3) === charCodes.dash\n    ) {\n      // `<!--`, an XML-style comment that should be interpreted as a line comment\n      this.skipLineComment(4);\n      this.skipSpace();\n      this.nextToken();\n      return;\n    }\n\n    if (next === charCodes.equalsTo) {\n      // <= | >=\n      size = 2;\n    }\n\n    this.finishOp(tt.relational, size);\n  }\n\n  readToken_eq_excl(code: number): void {\n    // '=!'\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    if (next === charCodes.equalsTo) {\n      this.finishOp(\n        tt.equality,\n        this.input.charCodeAt(this.state.pos + 2) === charCodes.equalsTo\n          ? 3\n          : 2,\n      );\n      return;\n    }\n    if (code === charCodes.equalsTo && next === charCodes.greaterThan) {\n      // '=>'\n      this.state.pos += 2;\n      this.finishToken(tt.arrow);\n      return;\n    }\n    this.finishOp(code === charCodes.equalsTo ? tt.eq : tt.bang, 1);\n  }\n\n  readToken_question(): void {\n    // '?'\n    const next = this.input.charCodeAt(this.state.pos + 1);\n    const next2 = this.input.charCodeAt(this.state.pos + 2);\n    if (next === charCodes.questionMark && !this.state.inType) {\n      if (next2 === charCodes.equalsTo) {\n        // '??='\n        this.finishOp(tt.assign, 3);\n      } else {\n        // '??'\n        this.finishOp(tt.nullishCoalescing, 2);\n      }\n    } else if (\n      next === charCodes.dot &&\n      !(next2 >= charCodes.digit0 && next2 <= charCodes.digit9)\n    ) {\n      // '.' not followed by a number\n      this.state.pos += 2;\n      this.finishToken(tt.questionDot);\n    } else {\n      ++this.state.pos;\n      this.finishToken(tt.question);\n    }\n  }\n\n  getTokenFromCode(code: number): void {\n    switch (code) {\n      // The interpretation of a dot depends on whether it is followed\n      // by a digit or another two dots.\n\n      case charCodes.dot:\n        this.readToken_dot();\n        return;\n\n      // Punctuation tokens.\n      case charCodes.leftParenthesis:\n        ++this.state.pos;\n        this.finishToken(tt.parenL);\n        return;\n      case charCodes.rightParenthesis:\n        ++this.state.pos;\n        this.finishToken(tt.parenR);\n        return;\n      case charCodes.semicolon:\n        ++this.state.pos;\n        this.finishToken(tt.semi);\n        return;\n      case charCodes.comma:\n        ++this.state.pos;\n        this.finishToken(tt.comma);\n        return;\n      case charCodes.leftSquareBracket:\n        if (\n          this.hasPlugin(\"recordAndTuple\") &&\n          this.input.charCodeAt(this.state.pos + 1) === charCodes.verticalBar\n        ) {\n          if (this.getPluginOption(\"recordAndTuple\", \"syntaxType\") !== \"bar\") {\n            throw this.raise(\n              this.state.pos,\n              Errors.TupleExpressionBarIncorrectStartSyntaxType,\n            );\n          }\n\n          // [|\n          this.finishToken(tt.bracketBarL);\n          this.state.pos += 2;\n        } else {\n          ++this.state.pos;\n          this.finishToken(tt.bracketL);\n        }\n        return;\n      case charCodes.rightSquareBracket:\n        ++this.state.pos;\n        this.finishToken(tt.bracketR);\n        return;\n      case charCodes.leftCurlyBrace:\n        if (\n          this.hasPlugin(\"recordAndTuple\") &&\n          this.input.charCodeAt(this.state.pos + 1) === charCodes.verticalBar\n        ) {\n          if (this.getPluginOption(\"recordAndTuple\", \"syntaxType\") !== \"bar\") {\n            throw this.raise(\n              this.state.pos,\n              Errors.RecordExpressionBarIncorrectStartSyntaxType,\n            );\n          }\n\n          // {|\n          this.finishToken(tt.braceBarL);\n          this.state.pos += 2;\n        } else {\n          ++this.state.pos;\n          this.finishToken(tt.braceL);\n        }\n        return;\n      case charCodes.rightCurlyBrace:\n        ++this.state.pos;\n        this.finishToken(tt.braceR);\n        return;\n\n      case charCodes.colon:\n        if (\n          this.hasPlugin(\"functionBind\") &&\n          this.input.charCodeAt(this.state.pos + 1) === charCodes.colon\n        ) {\n          this.finishOp(tt.doubleColon, 2);\n        } else {\n          ++this.state.pos;\n          this.finishToken(tt.colon);\n        }\n        return;\n\n      case charCodes.questionMark:\n        this.readToken_question();\n        return;\n\n      case charCodes.graveAccent:\n        ++this.state.pos;\n        this.finishToken(tt.backQuote);\n        return;\n\n      case charCodes.digit0: {\n        const next = this.input.charCodeAt(this.state.pos + 1);\n        // '0x', '0X' - hex number\n        if (next === charCodes.lowercaseX || next === charCodes.uppercaseX) {\n          this.readRadixNumber(16);\n          return;\n        }\n        // '0o', '0O' - octal number\n        if (next === charCodes.lowercaseO || next === charCodes.uppercaseO) {\n          this.readRadixNumber(8);\n          return;\n        }\n        // '0b', '0B' - binary number\n        if (next === charCodes.lowercaseB || next === charCodes.uppercaseB) {\n          this.readRadixNumber(2);\n          return;\n        }\n      }\n      // Anything else beginning with a digit is an integer, octal\n      // number, or float. (fall through)\n      case charCodes.digit1:\n      case charCodes.digit2:\n      case charCodes.digit3:\n      case charCodes.digit4:\n      case charCodes.digit5:\n      case charCodes.digit6:\n      case charCodes.digit7:\n      case charCodes.digit8:\n      case charCodes.digit9:\n        this.readNumber(false);\n        return;\n\n      // Quotes produce strings.\n      case charCodes.quotationMark:\n      case charCodes.apostrophe:\n        this.readString(code);\n        return;\n\n      // Operators are parsed inline in tiny state machines. '=' (charCodes.equalsTo) is\n      // often referred to. `finishOp` simply skips the amount of\n      // characters it is given as second argument, and returns a token\n      // of the type given by its first argument.\n\n      case charCodes.slash:\n        this.readToken_slash();\n        return;\n\n      case charCodes.percentSign:\n      case charCodes.asterisk:\n        this.readToken_mult_modulo(code);\n        return;\n\n      case charCodes.verticalBar:\n      case charCodes.ampersand:\n        this.readToken_pipe_amp(code);\n        return;\n\n      case charCodes.caret:\n        this.readToken_caret();\n        return;\n\n      case charCodes.plusSign:\n      case charCodes.dash:\n        this.readToken_plus_min(code);\n        return;\n\n      case charCodes.lessThan:\n      case charCodes.greaterThan:\n        this.readToken_lt_gt(code);\n        return;\n\n      case charCodes.equalsTo:\n      case charCodes.exclamationMark:\n        this.readToken_eq_excl(code);\n        return;\n\n      case charCodes.tilde:\n        this.finishOp(tt.tilde, 1);\n        return;\n\n      case charCodes.atSign:\n        ++this.state.pos;\n        this.finishToken(tt.at);\n        return;\n\n      case charCodes.numberSign:\n        this.readToken_numberSign();\n        return;\n\n      case charCodes.backslash:\n        this.readWord();\n        return;\n\n      default:\n        if (isIdentifierStart(code)) {\n          this.readWord();\n          return;\n        }\n    }\n\n    throw this.raise(\n      this.state.pos,\n      Errors.InvalidOrUnexpectedToken,\n      String.fromCodePoint(code),\n    );\n  }\n\n  finishOp(type: TokenType, size: number): void {\n    const str = this.input.slice(this.state.pos, this.state.pos + size);\n    this.state.pos += size;\n    this.finishToken(type, str);\n  }\n\n  readRegexp(): void {\n    const start = this.state.pos;\n    let escaped, inClass;\n    for (;;) {\n      if (this.state.pos >= this.length) {\n        throw this.raise(start, Errors.UnterminatedRegExp);\n      }\n      const ch = this.input.charAt(this.state.pos);\n      if (lineBreak.test(ch)) {\n        throw this.raise(start, Errors.UnterminatedRegExp);\n      }\n      if (escaped) {\n        escaped = false;\n      } else {\n        if (ch === \"[\") {\n          inClass = true;\n        } else if (ch === \"]\" && inClass) {\n          inClass = false;\n        } else if (ch === \"/\" && !inClass) {\n          break;\n        }\n        escaped = ch === \"\\\\\";\n      }\n      ++this.state.pos;\n    }\n    const content = this.input.slice(start, this.state.pos);\n    ++this.state.pos;\n\n    let mods = \"\";\n\n    while (this.state.pos < this.length) {\n      const char = this.input[this.state.pos];\n      const charCode = this.input.codePointAt(this.state.pos);\n\n      if (VALID_REGEX_FLAGS.has(char)) {\n        if (mods.indexOf(char) > -1) {\n          this.raise(this.state.pos + 1, Errors.DuplicateRegExpFlags);\n        }\n      } else if (\n        isIdentifierChar(charCode) ||\n        charCode === charCodes.backslash\n      ) {\n        this.raise(this.state.pos + 1, Errors.MalformedRegExpFlags);\n      } else {\n        break;\n      }\n\n      ++this.state.pos;\n      mods += char;\n    }\n\n    this.finishToken(tt.regexp, {\n      pattern: content,\n      flags: mods,\n    });\n  }\n\n  // Read an integer in the given radix. Return null if zero digits\n  // were read, the integer value otherwise. When `len` is given, this\n  // will return `null` unless the integer has exactly `len` digits.\n  // When `forceLen` is `true`, it means that we already know that in case\n  // of a malformed number we have to skip `len` characters anyway, instead\n  // of bailing out early. For example, in \"\\u{123Z}\" we want to read up to }\n  // anyway, while in \"\\u00Z\" we will stop at Z instead of consuming four\n  // characters (and thus the closing quote).\n\n  readInt(\n    radix: number,\n    len?: number,\n    forceLen?: boolean,\n    allowNumSeparator: boolean = true,\n  ): number | null {\n    const start = this.state.pos;\n    const forbiddenSiblings =\n      radix === 16\n        ? forbiddenNumericSeparatorSiblings.hex\n        : forbiddenNumericSeparatorSiblings.decBinOct;\n    const allowedSiblings =\n      radix === 16\n        ? allowedNumericSeparatorSiblings.hex\n        : radix === 10\n        ? allowedNumericSeparatorSiblings.dec\n        : radix === 8\n        ? allowedNumericSeparatorSiblings.oct\n        : allowedNumericSeparatorSiblings.bin;\n\n    let invalid = false;\n    let total = 0;\n\n    for (let i = 0, e = len == null ? Infinity : len; i < e; ++i) {\n      const code = this.input.charCodeAt(this.state.pos);\n      let val;\n\n      if (this.hasPlugin(\"numericSeparator\")) {\n        if (code === charCodes.underscore) {\n          const prev = this.input.charCodeAt(this.state.pos - 1);\n          const next = this.input.charCodeAt(this.state.pos + 1);\n          if (allowedSiblings.indexOf(next) === -1) {\n            this.raise(this.state.pos, Errors.UnexpectedNumericSeparator);\n          } else if (\n            forbiddenSiblings.indexOf(prev) > -1 ||\n            forbiddenSiblings.indexOf(next) > -1 ||\n            Number.isNaN(next)\n          ) {\n            this.raise(this.state.pos, Errors.UnexpectedNumericSeparator);\n          }\n\n          if (!allowNumSeparator) {\n            this.raise(this.state.pos, Errors.NumericSeparatorInEscapeSequence);\n          }\n\n          // Ignore this _ character\n          ++this.state.pos;\n          continue;\n        }\n      }\n\n      if (code >= charCodes.lowercaseA) {\n        val = code - charCodes.lowercaseA + charCodes.lineFeed;\n      } else if (code >= charCodes.uppercaseA) {\n        val = code - charCodes.uppercaseA + charCodes.lineFeed;\n      } else if (charCodes.isDigit(code)) {\n        val = code - charCodes.digit0; // 0-9\n      } else {\n        val = Infinity;\n      }\n      if (val >= radix) {\n        // If we are in \"errorRecovery\" mode and we found a digit which is too big,\n        // don't break the loop.\n\n        if (this.options.errorRecovery && val <= 9) {\n          val = 0;\n          this.raise(this.state.start + i + 2, Errors.InvalidDigit, radix);\n        } else if (forceLen) {\n          val = 0;\n          invalid = true;\n        } else {\n          break;\n        }\n      }\n      ++this.state.pos;\n      total = total * radix + val;\n    }\n    if (\n      this.state.pos === start ||\n      (len != null && this.state.pos - start !== len) ||\n      invalid\n    ) {\n      return null;\n    }\n\n    return total;\n  }\n\n  readRadixNumber(radix: number): void {\n    const start = this.state.pos;\n    let isBigInt = false;\n\n    this.state.pos += 2; // 0x\n    const val = this.readInt(radix);\n    if (val == null) {\n      this.raise(this.state.start + 2, Errors.InvalidDigit, radix);\n    }\n\n    if (this.input.charCodeAt(this.state.pos) === charCodes.lowercaseN) {\n      ++this.state.pos;\n      isBigInt = true;\n    }\n\n    if (isIdentifierStart(this.input.codePointAt(this.state.pos))) {\n      throw this.raise(this.state.pos, Errors.NumberIdentifier);\n    }\n\n    if (isBigInt) {\n      const str = this.input.slice(start, this.state.pos).replace(/[_n]/g, \"\");\n      this.finishToken(tt.bigint, str);\n      return;\n    }\n\n    this.finishToken(tt.num, val);\n  }\n\n  // Read an integer, octal integer, or floating-point number.\n\n  readNumber(startsWithDot: boolean): void {\n    const start = this.state.pos;\n    let isFloat = false;\n    let isBigInt = false;\n    let isNonOctalDecimalInt = false;\n\n    if (!startsWithDot && this.readInt(10) === null) {\n      this.raise(start, Errors.InvalidNumber);\n    }\n    let octal =\n      this.state.pos - start >= 2 &&\n      this.input.charCodeAt(start) === charCodes.digit0;\n    if (octal) {\n      if (this.state.strict) {\n        this.raise(start, Errors.StrictOctalLiteral);\n      }\n      if (/[89]/.test(this.input.slice(start, this.state.pos))) {\n        octal = false;\n        isNonOctalDecimalInt = true;\n      }\n    }\n\n    let next = this.input.charCodeAt(this.state.pos);\n    if (next === charCodes.dot && !octal) {\n      ++this.state.pos;\n      this.readInt(10);\n      isFloat = true;\n      next = this.input.charCodeAt(this.state.pos);\n    }\n\n    if (\n      (next === charCodes.uppercaseE || next === charCodes.lowercaseE) &&\n      !octal\n    ) {\n      next = this.input.charCodeAt(++this.state.pos);\n      if (next === charCodes.plusSign || next === charCodes.dash) {\n        ++this.state.pos;\n      }\n      if (this.readInt(10) === null) this.raise(start, \"Invalid number\");\n      isFloat = true;\n      next = this.input.charCodeAt(this.state.pos);\n    }\n\n    // disallow numeric separators in non octal decimals and legacy octal likes\n    if (this.hasPlugin(\"numericSeparator\") && (octal || isNonOctalDecimalInt)) {\n      const underscorePos = this.input\n        .slice(start, this.state.pos)\n        .indexOf(\"_\");\n      if (underscorePos > 0) {\n        this.raise(underscorePos + start, Errors.ZeroDigitNumericSeparator);\n      }\n    }\n\n    if (next === charCodes.lowercaseN) {\n      // disallow floats, legacy octal syntax and non octal decimals\n      // new style octal (\"0o\") is handled in this.readRadixNumber\n      if (isFloat || octal || isNonOctalDecimalInt) {\n        this.raise(start, \"Invalid BigIntLiteral\");\n      }\n      ++this.state.pos;\n      isBigInt = true;\n    }\n\n    if (isIdentifierStart(this.input.codePointAt(this.state.pos))) {\n      throw this.raise(this.state.pos, Errors.NumberIdentifier);\n    }\n\n    // remove \"_\" for numeric literal separator, and \"n\" for BigInts\n    const str = this.input.slice(start, this.state.pos).replace(/[_n]/g, \"\");\n\n    if (isBigInt) {\n      this.finishToken(tt.bigint, str);\n      return;\n    }\n\n    const val = octal ? parseInt(str, 8) : parseFloat(str);\n    this.finishToken(tt.num, val);\n  }\n\n  // Read a string value, interpreting backslash-escapes.\n\n  readCodePoint(throwOnInvalid: boolean): number | null {\n    const ch = this.input.charCodeAt(this.state.pos);\n    let code;\n\n    if (ch === charCodes.leftCurlyBrace) {\n      const codePos = ++this.state.pos;\n      code = this.readHexChar(\n        this.input.indexOf(\"}\", this.state.pos) - this.state.pos,\n        true,\n        throwOnInvalid,\n      );\n      ++this.state.pos;\n      if (code !== null && code > 0x10ffff) {\n        if (throwOnInvalid) {\n          this.raise(codePos, Errors.InvalidCodePoint);\n        } else {\n          return null;\n        }\n      }\n    } else {\n      code = this.readHexChar(4, false, throwOnInvalid);\n    }\n    return code;\n  }\n\n  readString(quote: number): void {\n    let out = \"\",\n      chunkStart = ++this.state.pos;\n    for (;;) {\n      if (this.state.pos >= this.length) {\n        throw this.raise(this.state.start, Errors.UnterminatedString);\n      }\n      const ch = this.input.charCodeAt(this.state.pos);\n      if (ch === quote) break;\n      if (ch === charCodes.backslash) {\n        out += this.input.slice(chunkStart, this.state.pos);\n        // $FlowFixMe\n        out += this.readEscapedChar(false);\n        chunkStart = this.state.pos;\n      } else if (\n        ch === charCodes.lineSeparator ||\n        ch === charCodes.paragraphSeparator\n      ) {\n        ++this.state.pos;\n        ++this.state.curLine;\n        this.state.lineStart = this.state.pos;\n      } else if (isNewLine(ch)) {\n        throw this.raise(this.state.start, Errors.UnterminatedString);\n      } else {\n        ++this.state.pos;\n      }\n    }\n    out += this.input.slice(chunkStart, this.state.pos++);\n    this.finishToken(tt.string, out);\n  }\n\n  // Reads template string tokens.\n\n  readTmplToken(): void {\n    let out = \"\",\n      chunkStart = this.state.pos,\n      containsInvalid = false;\n    for (;;) {\n      if (this.state.pos >= this.length) {\n        throw this.raise(this.state.start, Errors.UnterminatedTemplate);\n      }\n      const ch = this.input.charCodeAt(this.state.pos);\n      if (\n        ch === charCodes.graveAccent ||\n        (ch === charCodes.dollarSign &&\n          this.input.charCodeAt(this.state.pos + 1) ===\n            charCodes.leftCurlyBrace)\n      ) {\n        if (this.state.pos === this.state.start && this.match(tt.template)) {\n          if (ch === charCodes.dollarSign) {\n            this.state.pos += 2;\n            this.finishToken(tt.dollarBraceL);\n            return;\n          } else {\n            ++this.state.pos;\n            this.finishToken(tt.backQuote);\n            return;\n          }\n        }\n        out += this.input.slice(chunkStart, this.state.pos);\n        this.finishToken(tt.template, containsInvalid ? null : out);\n        return;\n      }\n      if (ch === charCodes.backslash) {\n        out += this.input.slice(chunkStart, this.state.pos);\n        const escaped = this.readEscapedChar(true);\n        if (escaped === null) {\n          containsInvalid = true;\n        } else {\n          out += escaped;\n        }\n        chunkStart = this.state.pos;\n      } else if (isNewLine(ch)) {\n        out += this.input.slice(chunkStart, this.state.pos);\n        ++this.state.pos;\n        switch (ch) {\n          case charCodes.carriageReturn:\n            if (this.input.charCodeAt(this.state.pos) === charCodes.lineFeed) {\n              ++this.state.pos;\n            }\n          // fall through\n          case charCodes.lineFeed:\n            out += \"\\n\";\n            break;\n          default:\n            out += String.fromCharCode(ch);\n            break;\n        }\n        ++this.state.curLine;\n        this.state.lineStart = this.state.pos;\n        chunkStart = this.state.pos;\n      } else {\n        ++this.state.pos;\n      }\n    }\n  }\n\n  // Used to read escaped characters\n\n  readEscapedChar(inTemplate: boolean): string | null {\n    const throwOnInvalid = !inTemplate;\n    const ch = this.input.charCodeAt(++this.state.pos);\n    ++this.state.pos;\n    switch (ch) {\n      case charCodes.lowercaseN:\n        return \"\\n\";\n      case charCodes.lowercaseR:\n        return \"\\r\";\n      case charCodes.lowercaseX: {\n        const code = this.readHexChar(2, false, throwOnInvalid);\n        return code === null ? null : String.fromCharCode(code);\n      }\n      case charCodes.lowercaseU: {\n        const code = this.readCodePoint(throwOnInvalid);\n        return code === null ? null : String.fromCodePoint(code);\n      }\n      case charCodes.lowercaseT:\n        return \"\\t\";\n      case charCodes.lowercaseB:\n        return \"\\b\";\n      case charCodes.lowercaseV:\n        return \"\\u000b\";\n      case charCodes.lowercaseF:\n        return \"\\f\";\n      case charCodes.carriageReturn:\n        if (this.input.charCodeAt(this.state.pos) === charCodes.lineFeed) {\n          ++this.state.pos;\n        }\n      // fall through\n      case charCodes.lineFeed:\n        this.state.lineStart = this.state.pos;\n        ++this.state.curLine;\n      // fall through\n      case charCodes.lineSeparator:\n      case charCodes.paragraphSeparator:\n        return \"\";\n      case charCodes.digit8:\n      case charCodes.digit9:\n        if (inTemplate) {\n          return null;\n        }\n      // fall through\n      default:\n        if (ch >= charCodes.digit0 && ch <= charCodes.digit7) {\n          const codePos = this.state.pos - 1;\n          // $FlowFixMe\n          let octalStr = this.input\n            .substr(this.state.pos - 1, 3)\n            .match(/^[0-7]+/)[0];\n          let octal = parseInt(octalStr, 8);\n          if (octal > 255) {\n            octalStr = octalStr.slice(0, -1);\n            octal = parseInt(octalStr, 8);\n          }\n          this.state.pos += octalStr.length - 1;\n          const next = this.input.charCodeAt(this.state.pos);\n          if (\n            octalStr !== \"0\" ||\n            next === charCodes.digit8 ||\n            next === charCodes.digit9\n          ) {\n            if (inTemplate) {\n              return null;\n            } else if (this.state.strict) {\n              this.raise(codePos, Errors.StrictOctalLiteral);\n            } else {\n              // This property is used to throw an error for\n              // an octal literal in a directive that occurs prior\n              // to a \"use strict\" directive.\n              this.state.octalPositions.push(codePos);\n            }\n          }\n\n          return String.fromCharCode(octal);\n        }\n\n        return String.fromCharCode(ch);\n    }\n  }\n\n  // Used to read character escape sequences ('\\x', '\\u').\n\n  readHexChar(\n    len: number,\n    forceLen: boolean,\n    throwOnInvalid: boolean,\n  ): number | null {\n    const codePos = this.state.pos;\n    const n = this.readInt(16, len, forceLen, false);\n    if (n === null) {\n      if (throwOnInvalid) {\n        this.raise(codePos, Errors.InvalidEscapeSequence);\n      } else {\n        this.state.pos = codePos - 1;\n      }\n    }\n    return n;\n  }\n\n  // Read an identifier, and return it as a string. Sets `this.state.containsEsc`\n  // to whether the word contained a '\\u' escape.\n  //\n  // Incrementally adds only escaped chars, adding other chunks as-is\n  // as a micro-optimization.\n\n  readWord1(): string {\n    let word = \"\";\n    this.state.containsEsc = false;\n    const start = this.state.pos;\n    let chunkStart = this.state.pos;\n\n    while (this.state.pos < this.length) {\n      const ch = this.input.codePointAt(this.state.pos);\n      if (isIdentifierChar(ch)) {\n        this.state.pos += ch <= 0xffff ? 1 : 2;\n      } else if (this.state.isIterator && ch === charCodes.atSign) {\n        ++this.state.pos;\n      } else if (ch === charCodes.backslash) {\n        this.state.containsEsc = true;\n\n        word += this.input.slice(chunkStart, this.state.pos);\n        const escStart = this.state.pos;\n        const identifierCheck =\n          this.state.pos === start ? isIdentifierStart : isIdentifierChar;\n\n        if (this.input.charCodeAt(++this.state.pos) !== charCodes.lowercaseU) {\n          this.raise(this.state.pos, Errors.MissingUnicodeEscape);\n          continue;\n        }\n\n        ++this.state.pos;\n        const esc = this.readCodePoint(true);\n        if (esc !== null) {\n          if (!identifierCheck(esc)) {\n            this.raise(escStart, Errors.EscapedCharNotAnIdentifier);\n          }\n\n          word += String.fromCodePoint(esc);\n        }\n        chunkStart = this.state.pos;\n      } else {\n        break;\n      }\n    }\n    return word + this.input.slice(chunkStart, this.state.pos);\n  }\n\n  isIterator(word: string): boolean {\n    return word === \"@@iterator\" || word === \"@@asyncIterator\";\n  }\n\n  // Read an identifier or keyword token. Will check for reserved\n  // words when necessary.\n\n  readWord(): void {\n    const word = this.readWord1();\n    const type = keywordTypes.get(word) || tt.name;\n\n    // Allow @@iterator and @@asyncIterator as a identifier only inside type\n    if (\n      this.state.isIterator &&\n      (!this.isIterator(word) || !this.state.inType)\n    ) {\n      this.raise(this.state.pos, Errors.InvalidIdentifier, word);\n    }\n\n    this.finishToken(type, word);\n  }\n\n  checkKeywordEscapes(): void {\n    const kw = this.state.type.keyword;\n    if (kw && this.state.containsEsc) {\n      this.raise(this.state.start, Errors.InvalidEscapedReservedWord, kw);\n    }\n  }\n\n  braceIsBlock(prevType: TokenType): boolean {\n    const parent = this.curContext();\n    if (parent === ct.functionExpression || parent === ct.functionStatement) {\n      return true;\n    }\n    if (\n      prevType === tt.colon &&\n      (parent === ct.braceStatement || parent === ct.braceExpression)\n    ) {\n      return !parent.isExpr;\n    }\n\n    // The check for `tt.name && exprAllowed` detects whether we are\n    // after a `yield` or `of` construct. See the `updateContext` for\n    // `tt.name`.\n    if (\n      prevType === tt._return ||\n      (prevType === tt.name && this.state.exprAllowed)\n    ) {\n      return lineBreak.test(\n        this.input.slice(this.state.lastTokEnd, this.state.start),\n      );\n    }\n\n    if (\n      prevType === tt._else ||\n      prevType === tt.semi ||\n      prevType === tt.eof ||\n      prevType === tt.parenR ||\n      prevType === tt.arrow\n    ) {\n      return true;\n    }\n\n    if (prevType === tt.braceL) {\n      return parent === ct.braceStatement;\n    }\n\n    if (\n      prevType === tt._var ||\n      prevType === tt._const ||\n      prevType === tt.name\n    ) {\n      return false;\n    }\n\n    if (prevType === tt.relational) {\n      // `class C<T> { ... }`\n      return true;\n    }\n\n    return !this.state.exprAllowed;\n  }\n\n  updateContext(prevType: TokenType): void {\n    const type = this.state.type;\n    let update;\n\n    if (type.keyword && (prevType === tt.dot || prevType === tt.questionDot)) {\n      this.state.exprAllowed = false;\n    } else if ((update = type.updateContext)) {\n      update.call(this, prevType);\n    } else {\n      this.state.exprAllowed = type.beforeExpr;\n    }\n  }\n}\n","// @flow\n\nimport { types as tt, type TokenType } from \"../tokenizer/types\";\nimport Tokenizer from \"../tokenizer\";\nimport State from \"../tokenizer/state\";\nimport type { Node } from \"../types\";\nimport { lineBreak } from \"../util/whitespace\";\nimport { isIdentifierChar } from \"../util/identifier\";\nimport * as charCodes from \"charcodes\";\nimport { Errors } from \"./location\";\n\ntype TryParse<Node, Error, Thrown, Aborted, FailState> = {\n  node: Node,\n  error: Error,\n  thrown: Thrown,\n  aborted: Aborted,\n  failState: FailState,\n};\n\n// ## Parser utilities\n\nexport default class UtilParser extends Tokenizer {\n  // TODO\n\n  addExtra(node: Node, key: string, val: any): void {\n    if (!node) return;\n\n    const extra = (node.extra = node.extra || {});\n    extra[key] = val;\n  }\n\n  // TODO\n\n  isRelational(op: \"<\" | \">\"): boolean {\n    return this.match(tt.relational) && this.state.value === op;\n  }\n\n  isLookaheadRelational(op: \"<\" | \">\"): boolean {\n    const next = this.nextTokenStart();\n    if (this.input.charAt(next) === op) {\n      if (next + 1 === this.input.length) {\n        return true;\n      }\n      const afterNext = this.input.charCodeAt(next + 1);\n      return afterNext !== op.charCodeAt(0) && afterNext !== charCodes.equalsTo;\n    }\n    return false;\n  }\n\n  // TODO\n\n  expectRelational(op: \"<\" | \">\"): void {\n    if (this.isRelational(op)) {\n      this.next();\n    } else {\n      this.unexpected(null, tt.relational);\n    }\n  }\n\n  // Tests whether parsed token is a contextual keyword.\n\n  isContextual(name: string): boolean {\n    return (\n      this.match(tt.name) &&\n      this.state.value === name &&\n      !this.state.containsEsc\n    );\n  }\n\n  isUnparsedContextual(nameStart: number, name: string): boolean {\n    const nameEnd = nameStart + name.length;\n    return (\n      this.input.slice(nameStart, nameEnd) === name &&\n      (nameEnd === this.input.length ||\n        !isIdentifierChar(this.input.charCodeAt(nameEnd)))\n    );\n  }\n\n  isLookaheadContextual(name: string): boolean {\n    const next = this.nextTokenStart();\n    return this.isUnparsedContextual(next, name);\n  }\n\n  // Consumes contextual keyword if possible.\n\n  eatContextual(name: string): boolean {\n    return this.isContextual(name) && this.eat(tt.name);\n  }\n\n  // Asserts that following token is given contextual keyword.\n\n  expectContextual(name: string, message?: string): void {\n    if (!this.eatContextual(name)) this.unexpected(null, message);\n  }\n\n  // Test whether a semicolon can be inserted at the current position.\n\n  canInsertSemicolon(): boolean {\n    return (\n      this.match(tt.eof) ||\n      this.match(tt.braceR) ||\n      this.hasPrecedingLineBreak()\n    );\n  }\n\n  hasPrecedingLineBreak(): boolean {\n    return lineBreak.test(\n      this.input.slice(this.state.lastTokEnd, this.state.start),\n    );\n  }\n\n  // TODO\n\n  isLineTerminator(): boolean {\n    return this.eat(tt.semi) || this.canInsertSemicolon();\n  }\n\n  // Consume a semicolon, or, failing that, see if we are allowed to\n  // pretend that there is a semicolon at this position.\n\n  semicolon(): void {\n    if (!this.isLineTerminator()) this.unexpected(null, tt.semi);\n  }\n\n  // Expect a token of a given type. If found, consume it, otherwise,\n  // raise an unexpected token error at given pos.\n\n  expect(type: TokenType, pos?: ?number): void {\n    this.eat(type) || this.unexpected(pos, type);\n  }\n\n  // Throws if the current token and the prev one are separated by a space.\n  assertNoSpace(message: string = \"Unexpected space.\"): void {\n    if (this.state.start > this.state.lastTokEnd) {\n      this.raise(this.state.lastTokEnd, message);\n    }\n  }\n\n  // Raise an unexpected token error. Can take the expected token type\n  // instead of a message string.\n\n  unexpected(\n    pos: ?number,\n    messageOrType: string | TokenType = \"Unexpected token\",\n  ): empty {\n    if (typeof messageOrType !== \"string\") {\n      messageOrType = `Unexpected token, expected \"${messageOrType.label}\"`;\n    }\n    throw this.raise(pos != null ? pos : this.state.start, messageOrType);\n  }\n\n  expectPlugin(name: string, pos?: ?number): true {\n    if (!this.hasPlugin(name)) {\n      throw this.raiseWithData(\n        pos != null ? pos : this.state.start,\n        { missingPlugin: [name] },\n        `This experimental syntax requires enabling the parser plugin: '${name}'`,\n      );\n    }\n\n    return true;\n  }\n\n  expectOnePlugin(names: Array<string>, pos?: ?number): void {\n    if (!names.some(n => this.hasPlugin(n))) {\n      throw this.raiseWithData(\n        pos != null ? pos : this.state.start,\n        { missingPlugin: names },\n        `This experimental syntax requires enabling one of the following parser plugin(s): '${names.join(\n          \", \",\n        )}'`,\n      );\n    }\n  }\n\n  checkYieldAwaitInDefaultParams() {\n    if (\n      this.state.yieldPos !== -1 &&\n      (this.state.awaitPos === -1 || this.state.yieldPos < this.state.awaitPos)\n    ) {\n      this.raise(\n        this.state.yieldPos,\n        \"Yield cannot be used as name inside a generator function\",\n      );\n    }\n    if (this.state.awaitPos !== -1) {\n      this.raise(\n        this.state.awaitPos,\n        \"Await cannot be used as name inside an async function\",\n      );\n    }\n  }\n\n  // tryParse will clone parser state.\n  // It is expensive and should be used with cautions\n  tryParse<T: Node | $ReadOnlyArray<Node>>(\n    fn: (abort: (node?: T) => empty) => T,\n    oldState: State = this.state.clone(),\n  ):\n    | TryParse<T, null, false, false, null>\n    | TryParse<T | null, SyntaxError, boolean, false, State>\n    | TryParse<T | null, null, false, true, State> {\n    const abortSignal: { node: T | null } = { node: null };\n    try {\n      const node = fn((node = null) => {\n        abortSignal.node = node;\n        throw abortSignal;\n      });\n      if (this.state.errors.length > oldState.errors.length) {\n        const failState = this.state;\n        this.state = oldState;\n        return {\n          node,\n          error: (failState.errors[oldState.errors.length]: SyntaxError),\n          thrown: false,\n          aborted: false,\n          failState,\n        };\n      }\n\n      return {\n        node,\n        error: null,\n        thrown: false,\n        aborted: false,\n        failState: null,\n      };\n    } catch (error) {\n      const failState = this.state;\n      this.state = oldState;\n      if (error instanceof SyntaxError) {\n        return { node: null, error, thrown: true, aborted: false, failState };\n      }\n      if (error === abortSignal) {\n        return {\n          node: abortSignal.node,\n          error: null,\n          thrown: false,\n          aborted: true,\n          failState,\n        };\n      }\n\n      throw error;\n    }\n  }\n\n  checkExpressionErrors(\n    refExpressionErrors: ?ExpressionErrors,\n    andThrow: boolean,\n  ) {\n    if (!refExpressionErrors) return false;\n    const { shorthandAssign, doubleProto } = refExpressionErrors;\n    if (!andThrow) return shorthandAssign >= 0 || doubleProto >= 0;\n    if (shorthandAssign >= 0) {\n      this.unexpected(shorthandAssign);\n    }\n    if (doubleProto >= 0) {\n      this.raise(doubleProto, Errors.DuplicateProto);\n    }\n  }\n}\n\n/**\n * The ExpressionErrors is a context struct used to track\n * - **shorthandAssign**: track initializer `=` position when parsing ambiguous\n *   patterns. When we are sure the parsed pattern is a RHS, which means it is\n *   not a pattern, we will throw on this position on invalid assign syntax,\n *   otherwise it will be reset to -1\n * - **doubleProto**: track the duplicate `__proto__` key position when parsing\n *   ambiguous object patterns. When we are sure the parsed pattern is a RHS,\n *   which means it is an object literal, we will throw on this position for\n *   __proto__ redefinition, otherwise it will be reset to -1\n */\nexport class ExpressionErrors {\n  shorthandAssign = -1;\n  doubleProto = -1;\n}\n","// @flow\n\nimport type Parser from \"./index\";\nimport UtilParser from \"./util\";\nimport { SourceLocation, type Position } from \"../util/location\";\nimport type { Comment, Node as NodeType, NodeBase } from \"../types\";\n\n// Start an AST node, attaching a start offset.\n\nclass Node implements NodeBase {\n  constructor(parser: Parser, pos: number, loc: Position) {\n    this.type = \"\";\n    this.start = pos;\n    this.end = 0;\n    this.loc = new SourceLocation(loc);\n    if (parser && parser.options.ranges) this.range = [pos, 0];\n    if (parser && parser.filename) this.loc.filename = parser.filename;\n  }\n\n  type: string;\n  start: number;\n  end: number;\n  loc: SourceLocation;\n  range: [number, number];\n  leadingComments: Array<Comment>;\n  trailingComments: Array<Comment>;\n  innerComments: Array<Comment>;\n  extra: { [key: string]: any };\n\n  __clone(): this {\n    // $FlowIgnore\n    const newNode: any = new Node();\n    const keys = Object.keys(this);\n    for (let i = 0, length = keys.length; i < length; i++) {\n      const key = keys[i];\n      // Do not clone comments that are already attached to the node\n      if (\n        key !== \"leadingComments\" &&\n        key !== \"trailingComments\" &&\n        key !== \"innerComments\"\n      ) {\n        // $FlowIgnore\n        newNode[key] = this[key];\n      }\n    }\n\n    return newNode;\n  }\n}\n\nexport class NodeUtils extends UtilParser {\n  startNode<T: NodeType>(): T {\n    // $FlowIgnore\n    return new Node(this, this.state.start, this.state.startLoc);\n  }\n\n  startNodeAt<T: NodeType>(pos: number, loc: Position): T {\n    // $FlowIgnore\n    return new Node(this, pos, loc);\n  }\n\n  /** Start a new node with a previous node's location. */\n  startNodeAtNode<T: NodeType>(type: NodeType): T {\n    return this.startNodeAt(type.start, type.loc.start);\n  }\n\n  // Finish an AST node, adding `type` and `end` properties.\n\n  finishNode<T: NodeType>(node: T, type: string): T {\n    return this.finishNodeAt(\n      node,\n      type,\n      this.state.lastTokEnd,\n      this.state.lastTokEndLoc,\n    );\n  }\n\n  // Finish node at given position\n\n  finishNodeAt<T: NodeType>(\n    node: T,\n    type: string,\n    pos: number,\n    loc: Position,\n  ): T {\n    if (process.env.NODE_ENV !== \"production\" && node.end > 0) {\n      throw new Error(\n        \"Do not call finishNode*() twice on the same node.\" +\n          \" Instead use resetEndLocation() or change type directly.\",\n      );\n    }\n    node.type = type;\n    node.end = pos;\n    node.loc.end = loc;\n    if (this.options.ranges) node.range[1] = pos;\n    this.processComment(node);\n    return node;\n  }\n\n  resetStartLocation(node: NodeBase, start: number, startLoc: Position): void {\n    node.start = start;\n    node.loc.start = startLoc;\n    if (this.options.ranges) node.range[0] = start;\n  }\n\n  resetEndLocation(\n    node: NodeBase,\n    end?: number = this.state.lastTokEnd,\n    endLoc?: Position = this.state.lastTokEndLoc,\n  ): void {\n    node.end = end;\n    node.loc.end = endLoc;\n    if (this.options.ranges) node.range[1] = end;\n  }\n\n  /**\n   * Reset the start location of node to the start location of locationNode\n   */\n  resetStartLocationFromNode(node: NodeBase, locationNode: NodeBase): void {\n    this.resetStartLocation(node, locationNode.start, locationNode.loc.start);\n  }\n}\n","// @flow\n\nimport * as charCodes from \"charcodes\";\nimport { types as tt, type TokenType } from \"../tokenizer/types\";\nimport type {\n  TSParameterProperty,\n  Decorator,\n  Expression,\n  Node,\n  Pattern,\n  RestElement,\n  SpreadElement,\n  /*:: Identifier, */\n  /*:: ObjectExpression, */\n  /*:: ObjectPattern, */\n} from \"../types\";\nimport type { Pos, Position } from \"../util/location\";\nimport {\n  isStrictBindOnlyReservedWord,\n  isStrictBindReservedWord,\n} from \"../util/identifier\";\nimport { NodeUtils } from \"./node\";\nimport { type BindingTypes, BIND_NONE } from \"../util/scopeflags\";\nimport { ExpressionErrors } from \"./util\";\nimport { Errors } from \"./location\";\n\nconst unwrapParenthesizedExpression = (node: Node) => {\n  return node.type === \"ParenthesizedExpression\"\n    ? unwrapParenthesizedExpression(node.expression)\n    : node;\n};\n\nexport default class LValParser extends NodeUtils {\n  // Forward-declaration: defined in expression.js\n  /*::\n  +parseIdentifier: (liberal?: boolean) => Identifier;\n  +parseMaybeAssign: (\n    noIn?: ?boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n    afterLeftParse?: Function,\n    refNeedsArrowPos?: ?Pos,\n  ) => Expression;\n  +parseObj: <T: ObjectPattern | ObjectExpression>(\n    close: TokenType,\n    isPattern: boolean,\n    isRecord?: ?boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n  ) => T;\n  */\n  // Forward-declaration: defined in statement.js\n  /*::\n  +parseDecorator: () => Decorator;\n  */\n\n  // Convert existing expression atom to assignable pattern\n  // if possible.\n  // NOTE: There is a corresponding \"isAssignable\" method in flow.js.\n  // When this one is updated, please check if also that one needs to be updated.\n\n  toAssignable(node: Node): Node {\n    let parenthesized = undefined;\n    if (node.type === \"ParenthesizedExpression\" || node.extra?.parenthesized) {\n      parenthesized = unwrapParenthesizedExpression(node);\n      if (\n        parenthesized.type !== \"Identifier\" &&\n        parenthesized.type !== \"MemberExpression\"\n      ) {\n        this.raise(node.start, Errors.InvalidParenthesizedAssignment);\n      }\n    }\n\n    switch (node.type) {\n      case \"Identifier\":\n      case \"ObjectPattern\":\n      case \"ArrayPattern\":\n      case \"AssignmentPattern\":\n        break;\n\n      case \"ObjectExpression\":\n        node.type = \"ObjectPattern\";\n        for (\n          let i = 0, length = node.properties.length, last = length - 1;\n          i < length;\n          i++\n        ) {\n          const prop = node.properties[i];\n          const isLast = i === last;\n          this.toAssignableObjectExpressionProp(prop, isLast);\n\n          if (\n            isLast &&\n            prop.type === \"RestElement\" &&\n            node.extra?.trailingComma\n          ) {\n            this.raiseRestNotLast(node.extra.trailingComma);\n          }\n        }\n        break;\n\n      case \"ObjectProperty\":\n        this.toAssignable(node.value);\n        break;\n\n      case \"SpreadElement\": {\n        this.checkToRestConversion(node);\n\n        node.type = \"RestElement\";\n        const arg = node.argument;\n        this.toAssignable(arg);\n        break;\n      }\n\n      case \"ArrayExpression\":\n        node.type = \"ArrayPattern\";\n        this.toAssignableList(node.elements, node.extra?.trailingComma);\n        break;\n\n      case \"AssignmentExpression\":\n        if (node.operator !== \"=\") {\n          this.raise(node.left.end, Errors.MissingEqInAssignment);\n        }\n\n        node.type = \"AssignmentPattern\";\n        delete node.operator;\n        this.toAssignable(node.left);\n        break;\n\n      case \"ParenthesizedExpression\":\n        this.toAssignable(((parenthesized: any): Expression));\n        break;\n\n      default:\n      // We don't know how to deal with this node. It will\n      // be reported by a later call to checkLVal\n    }\n    return node;\n  }\n\n  toAssignableObjectExpressionProp(prop: Node, isLast: boolean) {\n    if (prop.type === \"ObjectMethod\") {\n      const error =\n        prop.kind === \"get\" || prop.kind === \"set\"\n          ? Errors.PatternHasAccessor\n          : Errors.PatternHasMethod;\n\n      this.raise(prop.key.start, error);\n    } else if (prop.type === \"SpreadElement\" && !isLast) {\n      this.raiseRestNotLast(prop.start);\n    } else {\n      this.toAssignable(prop);\n    }\n  }\n\n  // Convert list of expression atoms to binding list.\n\n  toAssignableList(\n    exprList: Expression[],\n    trailingCommaPos?: ?number,\n  ): $ReadOnlyArray<Pattern> {\n    let end = exprList.length;\n    if (end) {\n      const last = exprList[end - 1];\n      if (last && last.type === \"RestElement\") {\n        --end;\n      } else if (last && last.type === \"SpreadElement\") {\n        last.type = \"RestElement\";\n        const arg = last.argument;\n        this.toAssignable(arg);\n        if (\n          arg.type !== \"Identifier\" &&\n          arg.type !== \"MemberExpression\" &&\n          arg.type !== \"ArrayPattern\" &&\n          arg.type !== \"ObjectPattern\"\n        ) {\n          this.unexpected(arg.start);\n        }\n\n        if (trailingCommaPos) {\n          this.raiseTrailingCommaAfterRest(trailingCommaPos);\n        }\n\n        --end;\n      }\n    }\n    for (let i = 0; i < end; i++) {\n      const elt = exprList[i];\n      if (elt) {\n        this.toAssignable(elt);\n        if (elt.type === \"RestElement\") {\n          this.raiseRestNotLast(elt.start);\n        }\n      }\n    }\n    return exprList;\n  }\n\n  // Convert list of expression atoms to a list of\n\n  toReferencedList(\n    exprList: $ReadOnlyArray<?Expression>,\n    isParenthesizedExpr?: boolean, // eslint-disable-line no-unused-vars\n  ): $ReadOnlyArray<?Expression> {\n    return exprList;\n  }\n\n  toReferencedListDeep(\n    exprList: $ReadOnlyArray<?Expression>,\n    isParenthesizedExpr?: boolean,\n  ): void {\n    this.toReferencedList(exprList, isParenthesizedExpr);\n\n    for (const expr of exprList) {\n      if (expr && expr.type === \"ArrayExpression\") {\n        this.toReferencedListDeep(expr.elements);\n      }\n    }\n  }\n\n  // Parses spread element.\n\n  parseSpread(\n    refExpressionErrors: ?ExpressionErrors,\n    refNeedsArrowPos?: ?Pos,\n  ): SpreadElement {\n    const node = this.startNode();\n    this.next();\n    node.argument = this.parseMaybeAssign(\n      false,\n      refExpressionErrors,\n      undefined,\n      refNeedsArrowPos,\n    );\n    return this.finishNode(node, \"SpreadElement\");\n  }\n\n  parseRestBinding(): RestElement {\n    const node = this.startNode();\n    this.next();\n    node.argument = this.parseBindingAtom();\n    return this.finishNode(node, \"RestElement\");\n  }\n\n  // Parses lvalue (assignable) atom.\n  parseBindingAtom(): Pattern {\n    switch (this.state.type) {\n      case tt.bracketL: {\n        const node = this.startNode();\n        this.next();\n        node.elements = this.parseBindingList(\n          tt.bracketR,\n          charCodes.rightSquareBracket,\n          true,\n        );\n        return this.finishNode(node, \"ArrayPattern\");\n      }\n\n      case tt.braceL:\n        return this.parseObj(tt.braceR, true);\n    }\n\n    return this.parseIdentifier();\n  }\n\n  parseBindingList(\n    close: TokenType,\n    closeCharCode: $Values<typeof charCodes>,\n    allowEmpty?: boolean,\n    allowModifiers?: boolean,\n  ): $ReadOnlyArray<Pattern | TSParameterProperty> {\n    const elts: Array<Pattern | TSParameterProperty> = [];\n    let first = true;\n    while (!this.eat(close)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma);\n      }\n      if (allowEmpty && this.match(tt.comma)) {\n        // $FlowFixMe This method returns `$ReadOnlyArray<?Pattern>` if `allowEmpty` is set.\n        elts.push(null);\n      } else if (this.eat(close)) {\n        break;\n      } else if (this.match(tt.ellipsis)) {\n        elts.push(this.parseAssignableListItemTypes(this.parseRestBinding()));\n        this.checkCommaAfterRest(closeCharCode);\n        this.expect(close);\n        break;\n      } else {\n        const decorators = [];\n        if (this.match(tt.at) && this.hasPlugin(\"decorators\")) {\n          this.raise(this.state.start, Errors.UnsupportedParameterDecorator);\n        }\n        while (this.match(tt.at)) {\n          decorators.push(this.parseDecorator());\n        }\n        elts.push(this.parseAssignableListItem(allowModifiers, decorators));\n      }\n    }\n    return elts;\n  }\n\n  parseAssignableListItem(\n    allowModifiers: ?boolean,\n    decorators: Decorator[],\n  ): Pattern | TSParameterProperty {\n    const left = this.parseMaybeDefault();\n    this.parseAssignableListItemTypes(left);\n    const elt = this.parseMaybeDefault(left.start, left.loc.start, left);\n    if (decorators.length) {\n      left.decorators = decorators;\n    }\n    return elt;\n  }\n\n  parseAssignableListItemTypes(param: Pattern): Pattern {\n    return param;\n  }\n\n  // Parses assignment pattern around given atom if possible.\n\n  parseMaybeDefault(\n    startPos?: ?number,\n    startLoc?: ?Position,\n    left?: ?Pattern,\n  ): Pattern {\n    startLoc = startLoc || this.state.startLoc;\n    startPos = startPos || this.state.start;\n    left = left || this.parseBindingAtom();\n    if (!this.eat(tt.eq)) return left;\n\n    const node = this.startNodeAt(startPos, startLoc);\n    node.left = left;\n    node.right = this.parseMaybeAssign();\n    return this.finishNode(node, \"AssignmentPattern\");\n  }\n\n  // Verify that a node is an lval — something that can be assigned\n  // to.\n\n  checkLVal(\n    expr: Expression,\n    bindingType: BindingTypes = BIND_NONE,\n    checkClashes: ?{ [key: string]: boolean },\n    contextDescription: string,\n    disallowLetBinding?: boolean,\n    strictModeChanged?: boolean = false,\n  ): void {\n    switch (expr.type) {\n      case \"Identifier\":\n        if (\n          this.state.strict &&\n          // \"Global\" reserved words have already been checked by parseIdentifier,\n          // unless they have been found in the id or parameters of a strict-mode\n          // function in a sloppy context.\n          (strictModeChanged\n            ? isStrictBindReservedWord(expr.name, this.inModule)\n            : isStrictBindOnlyReservedWord(expr.name))\n        ) {\n          this.raise(\n            expr.start,\n            bindingType === BIND_NONE\n              ? Errors.StrictEvalArguments\n              : Errors.StrictEvalArgumentsBinding,\n            expr.name,\n          );\n        }\n\n        if (checkClashes) {\n          // we need to prefix this with an underscore for the cases where we have a key of\n          // `__proto__`. there's a bug in old V8 where the following wouldn't work:\n          //\n          //   > var obj = Object.create(null);\n          //   undefined\n          //   > obj.__proto__\n          //   null\n          //   > obj.__proto__ = true;\n          //   true\n          //   > obj.__proto__\n          //   null\n          const key = `_${expr.name}`;\n\n          if (checkClashes[key]) {\n            this.raise(expr.start, Errors.ParamDupe);\n          } else {\n            checkClashes[key] = true;\n          }\n        }\n        if (disallowLetBinding && expr.name === \"let\") {\n          this.raise(expr.start, Errors.LetInLexicalBinding);\n        }\n        if (!(bindingType & BIND_NONE)) {\n          this.scope.declareName(expr.name, bindingType, expr.start);\n        }\n        break;\n\n      case \"MemberExpression\":\n        if (bindingType !== BIND_NONE) {\n          this.raise(expr.start, Errors.InvalidPropertyBindingPattern);\n        }\n        break;\n\n      case \"ObjectPattern\":\n        for (let prop of expr.properties) {\n          if (prop.type === \"ObjectProperty\") prop = prop.value;\n          // If we find here an ObjectMethod, it's because this was originally\n          // an ObjectExpression which has then been converted.\n          // toAssignable already reported this error with a nicer message.\n          else if (prop.type === \"ObjectMethod\") continue;\n\n          this.checkLVal(\n            prop,\n            bindingType,\n            checkClashes,\n            \"object destructuring pattern\",\n            disallowLetBinding,\n          );\n        }\n        break;\n\n      case \"ArrayPattern\":\n        for (const elem of expr.elements) {\n          if (elem) {\n            this.checkLVal(\n              elem,\n              bindingType,\n              checkClashes,\n              \"array destructuring pattern\",\n              disallowLetBinding,\n            );\n          }\n        }\n        break;\n\n      case \"AssignmentPattern\":\n        this.checkLVal(\n          expr.left,\n          bindingType,\n          checkClashes,\n          \"assignment pattern\",\n        );\n        break;\n\n      case \"RestElement\":\n        this.checkLVal(\n          expr.argument,\n          bindingType,\n          checkClashes,\n          \"rest element\",\n        );\n        break;\n\n      case \"ParenthesizedExpression\":\n        this.checkLVal(\n          expr.expression,\n          bindingType,\n          checkClashes,\n          \"parenthesized expression\",\n        );\n        break;\n\n      default: {\n        this.raise(\n          expr.start,\n          bindingType === BIND_NONE\n            ? Errors.InvalidLhs\n            : Errors.InvalidLhsBinding,\n          contextDescription,\n        );\n      }\n    }\n  }\n\n  checkToRestConversion(node: SpreadElement): void {\n    if (\n      node.argument.type !== \"Identifier\" &&\n      node.argument.type !== \"MemberExpression\"\n    ) {\n      this.raise(node.argument.start, Errors.InvalidRestAssignmentPattern);\n    }\n  }\n\n  checkCommaAfterRest(close: $Values<typeof charCodes>): void {\n    if (this.match(tt.comma)) {\n      if (this.lookaheadCharCode() === close) {\n        this.raiseTrailingCommaAfterRest(this.state.start);\n      } else {\n        this.raiseRestNotLast(this.state.start);\n      }\n    }\n  }\n\n  raiseRestNotLast(pos: number) {\n    throw this.raise(pos, Errors.ElementAfterRest);\n  }\n\n  raiseTrailingCommaAfterRest(pos: number) {\n    this.raise(pos, Errors.RestTrailingComma);\n  }\n}\n","// @flow\n\n// A recursive descent parser operates by defining functions for all\n// syntactic elements, and recursively calling those, each function\n// advancing the input stream and returning an AST node. Precedence\n// of constructs (for example, the fact that `!x[1]` means `!(x[1])`\n// instead of `(!x)[1]` is handled by the fact that the parser\n// function that parses unary prefix operators is called first, and\n// in turn calls the function that parses `[]` subscripts — that\n// way, it'll receive the node for `x[1]` already parsed, and wraps\n// *that* in the unary operator node.\n//\n// Acorn uses an [operator precedence parser][opp] to handle binary\n// operator precedence, because it is much more compact than using\n// the technique outlined above, which uses different, nesting\n// functions to specify precedence, for all of the ten binary\n// precedence levels that JavaScript defines.\n//\n// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser\n\nimport { types as tt, type TokenType } from \"../tokenizer/types\";\nimport { types as ct } from \"../tokenizer/context\";\nimport * as N from \"../types\";\nimport LValParser from \"./lval\";\nimport {\n  isKeyword,\n  isReservedWord,\n  isStrictReservedWord,\n  isStrictBindReservedWord,\n} from \"../util/identifier\";\nimport type { Pos, Position } from \"../util/location\";\nimport * as charCodes from \"charcodes\";\nimport {\n  BIND_OUTSIDE,\n  BIND_VAR,\n  SCOPE_ARROW,\n  SCOPE_CLASS,\n  SCOPE_DIRECT_SUPER,\n  SCOPE_FUNCTION,\n  SCOPE_SUPER,\n  SCOPE_PROGRAM,\n} from \"../util/scopeflags\";\nimport { ExpressionErrors } from \"./util\";\nimport {\n  PARAM_AWAIT,\n  PARAM_RETURN,\n  PARAM,\n  functionFlags,\n} from \"../util/production-parameter\";\nimport { Errors } from \"./location\";\n\nexport default class ExpressionParser extends LValParser {\n  // Forward-declaration: defined in statement.js\n  /*::\n  +parseBlock: (\n    allowDirectives?: boolean,\n    createNewLexicalScope?: boolean,\n    afterBlockParse?: (hasStrictModeDirective: boolean) => void,\n  ) => N.BlockStatement;\n  +parseClass: (\n    node: N.Class,\n    isStatement: boolean,\n    optionalId?: boolean,\n  ) => N.Class;\n  +parseDecorators: (allowExport?: boolean) => void;\n  +parseFunction: <T: N.NormalFunction>(\n    node: T,\n    statement?: number,\n    allowExpressionBody?: boolean,\n    isAsync?: boolean,\n  ) => T;\n  +parseFunctionParams: (node: N.Function, allowModifiers?: boolean) => void;\n  +takeDecorators: (node: N.HasDecorators) => void;\n  */\n\n  // Check if property __proto__ has been used more than once.\n  // If the expression is a destructuring assignment, then __proto__ may appear\n  // multiple times. Otherwise, __proto__ is a duplicated key.\n\n  checkDuplicatedProto(\n    prop: N.ObjectMember | N.SpreadElement,\n    protoRef: { used: boolean },\n    refExpressionErrors: ?ExpressionErrors,\n  ): void {\n    if (\n      prop.type === \"SpreadElement\" ||\n      prop.computed ||\n      prop.kind ||\n      // $FlowIgnore\n      prop.shorthand\n    ) {\n      return;\n    }\n\n    const key = prop.key;\n    // It is either an Identifier or a String/NumericLiteral\n    const name = key.type === \"Identifier\" ? key.name : String(key.value);\n\n    if (name === \"__proto__\") {\n      if (protoRef.used) {\n        if (refExpressionErrors) {\n          // Store the first redefinition's position, otherwise ignore because\n          // we are parsing ambiguous pattern\n          if (refExpressionErrors.doubleProto === -1) {\n            refExpressionErrors.doubleProto = key.start;\n          }\n        } else {\n          this.raise(key.start, Errors.DuplicateProto);\n        }\n      }\n\n      protoRef.used = true;\n    }\n  }\n\n  // Convenience method to parse an Expression only\n  getExpression(): N.Expression {\n    let paramFlags = PARAM;\n    if (this.hasPlugin(\"topLevelAwait\") && this.inModule) {\n      paramFlags |= PARAM_AWAIT;\n    }\n    this.scope.enter(SCOPE_PROGRAM);\n    this.prodParam.enter(paramFlags);\n    this.nextToken();\n    const expr = this.parseExpression();\n    if (!this.match(tt.eof)) {\n      this.unexpected();\n    }\n    expr.comments = this.state.comments;\n    expr.errors = this.state.errors;\n    return expr;\n  }\n\n  // ### Expression parsing\n\n  // These nest, from the most general expression type at the top to\n  // 'atomic', nondivisible expression types at the bottom. Most of\n  // the functions will simply let the function (s) below them parse,\n  // and, *if* the syntactic construct they handle is present, wrap\n  // the AST node that the inner parser gave them in another node.\n\n  // Parse a full expression.\n  // - `noIn`\n  //   is used to forbid the `in` operator (in for loops initialization expressions)\n  //   When `noIn` is true, the production parameter [In] is not present.\n  //   Whenever [?In] appears in the right-hand sides of a production, we pass\n  //   `noIn` to the subroutine calls.\n\n  // - `refExpressionErrors `\n  //   provides reference for storing '=' operator inside shorthand\n  //   property assignment in contexts where both object expression\n  //   and object pattern might appear (so it's possible to raise\n  //   delayed syntax error at correct position).\n\n  parseExpression(\n    noIn?: boolean,\n    refExpressionErrors?: ExpressionErrors,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    const expr = this.parseMaybeAssign(noIn, refExpressionErrors);\n    if (this.match(tt.comma)) {\n      const node = this.startNodeAt(startPos, startLoc);\n      node.expressions = [expr];\n      while (this.eat(tt.comma)) {\n        node.expressions.push(this.parseMaybeAssign(noIn, refExpressionErrors));\n      }\n      this.toReferencedList(node.expressions);\n      return this.finishNode(node, \"SequenceExpression\");\n    }\n    return expr;\n  }\n\n  // Parse an assignment expression. This includes applications of\n  // operators like `+=`.\n\n  parseMaybeAssign(\n    noIn?: ?boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n    afterLeftParse?: Function,\n    refNeedsArrowPos?: ?Pos,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    if (this.isContextual(\"yield\")) {\n      if (this.prodParam.hasYield) {\n        let left = this.parseYield(noIn);\n        if (afterLeftParse) {\n          left = afterLeftParse.call(this, left, startPos, startLoc);\n        }\n        return left;\n      } else {\n        // The tokenizer will assume an expression is allowed after\n        // `yield`, but this isn't that kind of yield\n        this.state.exprAllowed = false;\n      }\n    }\n\n    let ownExpressionErrors;\n    if (refExpressionErrors) {\n      ownExpressionErrors = false;\n    } else {\n      refExpressionErrors = new ExpressionErrors();\n      ownExpressionErrors = true;\n    }\n\n    if (this.match(tt.parenL) || this.match(tt.name)) {\n      this.state.potentialArrowAt = this.state.start;\n    }\n\n    let left = this.parseMaybeConditional(\n      noIn,\n      refExpressionErrors,\n      refNeedsArrowPos,\n    );\n    if (afterLeftParse) {\n      left = afterLeftParse.call(this, left, startPos, startLoc);\n    }\n    if (this.state.type.isAssign) {\n      const node = this.startNodeAt(startPos, startLoc);\n      const operator = this.state.value;\n      node.operator = operator;\n\n      if (operator === \"??=\") {\n        this.expectPlugin(\"logicalAssignment\");\n      }\n      if (operator === \"||=\" || operator === \"&&=\") {\n        this.expectPlugin(\"logicalAssignment\");\n      }\n      if (this.match(tt.eq)) {\n        node.left = this.toAssignable(left);\n        refExpressionErrors.doubleProto = -1; // reset because double __proto__ is valid in assignment expression\n      } else {\n        node.left = left;\n      }\n\n      if (refExpressionErrors.shorthandAssign >= node.left.start) {\n        refExpressionErrors.shorthandAssign = -1; // reset because shorthand default was used correctly\n      }\n\n      this.checkLVal(left, undefined, undefined, \"assignment expression\");\n\n      this.next();\n      node.right = this.parseMaybeAssign(noIn);\n      return this.finishNode(node, \"AssignmentExpression\");\n    } else if (ownExpressionErrors) {\n      this.checkExpressionErrors(refExpressionErrors, true);\n    }\n\n    return left;\n  }\n\n  // Parse a ternary conditional (`?:`) operator.\n\n  parseMaybeConditional(\n    noIn: ?boolean,\n    refExpressionErrors: ExpressionErrors,\n    refNeedsArrowPos?: ?Pos,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    const potentialArrowAt = this.state.potentialArrowAt;\n    const expr = this.parseExprOps(noIn, refExpressionErrors);\n\n    if (\n      expr.type === \"ArrowFunctionExpression\" &&\n      expr.start === potentialArrowAt\n    ) {\n      return expr;\n    }\n    if (this.checkExpressionErrors(refExpressionErrors, false)) return expr;\n\n    return this.parseConditional(\n      expr,\n      noIn,\n      startPos,\n      startLoc,\n      refNeedsArrowPos,\n    );\n  }\n\n  parseConditional(\n    expr: N.Expression,\n    noIn: ?boolean,\n    startPos: number,\n    startLoc: Position,\n    // FIXME: Disabling this for now since can't seem to get it to play nicely\n    // eslint-disable-next-line no-unused-vars\n    refNeedsArrowPos?: ?Pos,\n  ): N.Expression {\n    if (this.eat(tt.question)) {\n      const node = this.startNodeAt(startPos, startLoc);\n      node.test = expr;\n      node.consequent = this.parseMaybeAssign();\n      this.expect(tt.colon);\n      node.alternate = this.parseMaybeAssign(noIn);\n      return this.finishNode(node, \"ConditionalExpression\");\n    }\n    return expr;\n  }\n\n  // Start the precedence parser.\n\n  parseExprOps(\n    noIn: ?boolean,\n    refExpressionErrors: ExpressionErrors,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    const potentialArrowAt = this.state.potentialArrowAt;\n    const expr = this.parseMaybeUnary(refExpressionErrors);\n\n    if (\n      expr.type === \"ArrowFunctionExpression\" &&\n      expr.start === potentialArrowAt\n    ) {\n      return expr;\n    }\n    if (this.checkExpressionErrors(refExpressionErrors, false)) {\n      return expr;\n    }\n\n    return this.parseExprOp(expr, startPos, startLoc, -1, noIn);\n  }\n\n  // Parse binary operators with the operator precedence parsing\n  // algorithm. `left` is the left-hand side of the operator.\n  // `minPrec` provides context that allows the function to stop and\n  // defer further parser to one of its callers when it encounters an\n  // operator that has a lower precedence than the set it is parsing.\n\n  parseExprOp(\n    left: N.Expression,\n    leftStartPos: number,\n    leftStartLoc: Position,\n    minPrec: number,\n    noIn: ?boolean,\n  ): N.Expression {\n    let prec = this.state.type.binop;\n    if (prec != null && (!noIn || !this.match(tt._in))) {\n      if (prec > minPrec) {\n        const operator = this.state.value;\n        if (operator === \"|>\" && this.state.inFSharpPipelineDirectBody) {\n          return left;\n        }\n        const node = this.startNodeAt(leftStartPos, leftStartLoc);\n        node.left = left;\n        node.operator = operator;\n        if (\n          operator === \"**\" &&\n          left.type === \"UnaryExpression\" &&\n          (this.options.createParenthesizedExpressions ||\n            !(left.extra && left.extra.parenthesized))\n        ) {\n          this.raise(\n            left.argument.start,\n            Errors.UnexpectedTokenUnaryExponentiation,\n          );\n        }\n\n        const op = this.state.type;\n        const logical = op === tt.logicalOR || op === tt.logicalAND;\n        const coalesce = op === tt.nullishCoalescing;\n\n        if (op === tt.pipeline) {\n          this.expectPlugin(\"pipelineOperator\");\n          this.state.inPipeline = true;\n          this.checkPipelineAtInfixOperator(left, leftStartPos);\n        } else if (coalesce) {\n          // Handle the precedence of `tt.coalesce` as equal to the range of logical expressions.\n          // In other words, `node.right` shouldn't contain logical expressions in order to check the mixed error.\n          prec = ((tt.logicalAND: any): { binop: number }).binop;\n        }\n\n        this.next();\n\n        if (\n          op === tt.pipeline &&\n          this.getPluginOption(\"pipelineOperator\", \"proposal\") === \"minimal\"\n        ) {\n          if (\n            this.match(tt.name) &&\n            this.state.value === \"await\" &&\n            this.prodParam.hasAwait\n          ) {\n            throw this.raise(\n              this.state.start,\n              Errors.UnexpectedAwaitAfterPipelineBody,\n            );\n          }\n        }\n\n        node.right = this.parseExprOpRightExpr(op, prec, noIn);\n        this.finishNode(\n          node,\n          logical || coalesce ? \"LogicalExpression\" : \"BinaryExpression\",\n        );\n        /* this check is for all ?? operators\n         * a ?? b && c for this example\n         * when op is coalesce and nextOp is logical (&&), throw at the pos of nextOp that it can not be mixed.\n         * Symmetrically it also throws when op is logical and nextOp is coalesce\n         */\n        const nextOp = this.state.type;\n        if (\n          (coalesce && (nextOp === tt.logicalOR || nextOp === tt.logicalAND)) ||\n          (logical && nextOp === tt.nullishCoalescing)\n        ) {\n          throw this.raise(this.state.start, Errors.MixingCoalesceWithLogical);\n        }\n\n        return this.parseExprOp(\n          node,\n          leftStartPos,\n          leftStartLoc,\n          minPrec,\n          noIn,\n        );\n      }\n    }\n    return left;\n  }\n\n  // Helper function for `parseExprOp`. Parse the right-hand side of binary-\n  // operator expressions, then apply any operator-specific functions.\n\n  parseExprOpRightExpr(\n    op: TokenType,\n    prec: number,\n    noIn: ?boolean,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    switch (op) {\n      case tt.pipeline:\n        switch (this.getPluginOption(\"pipelineOperator\", \"proposal\")) {\n          case \"smart\":\n            return this.withTopicPermittingContext(() => {\n              return this.parseSmartPipelineBody(\n                this.parseExprOpBaseRightExpr(op, prec, noIn),\n                startPos,\n                startLoc,\n              );\n            });\n          case \"fsharp\":\n            return this.withSoloAwaitPermittingContext(() => {\n              return this.parseFSharpPipelineBody(prec, noIn);\n            });\n        }\n      // falls through\n\n      default:\n        return this.parseExprOpBaseRightExpr(op, prec, noIn);\n    }\n  }\n\n  // Helper function for `parseExprOpRightExpr`. Parse the right-hand side of\n  // binary-operator expressions without applying any operator-specific functions.\n\n  parseExprOpBaseRightExpr(\n    op: TokenType,\n    prec: number,\n    noIn: ?boolean,\n  ): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n\n    return this.parseExprOp(\n      this.parseMaybeUnary(),\n      startPos,\n      startLoc,\n      op.rightAssociative ? prec - 1 : prec,\n      noIn,\n    );\n  }\n\n  // Parse unary operators, both prefix and postfix.\n\n  parseMaybeUnary(refExpressionErrors: ?ExpressionErrors): N.Expression {\n    if (this.isContextual(\"await\") && this.isAwaitAllowed()) {\n      return this.parseAwait();\n    } else if (this.state.type.prefix) {\n      const node = this.startNode();\n      const update = this.match(tt.incDec);\n      node.operator = this.state.value;\n      node.prefix = true;\n\n      if (node.operator === \"throw\") {\n        this.expectPlugin(\"throwExpressions\");\n      }\n      this.next();\n\n      node.argument = this.parseMaybeUnary();\n\n      this.checkExpressionErrors(refExpressionErrors, true);\n\n      if (update) {\n        this.checkLVal(node.argument, undefined, undefined, \"prefix operation\");\n      } else if (this.state.strict && node.operator === \"delete\") {\n        const arg = node.argument;\n\n        if (arg.type === \"Identifier\") {\n          this.raise(node.start, Errors.StrictDelete);\n        } else if (\n          arg.type === \"MemberExpression\" &&\n          arg.property.type === \"PrivateName\"\n        ) {\n          this.raise(node.start, Errors.DeletePrivateField);\n        }\n      }\n\n      return this.finishNode(\n        node,\n        update ? \"UpdateExpression\" : \"UnaryExpression\",\n      );\n    }\n\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    let expr = this.parseExprSubscripts(refExpressionErrors);\n    if (this.checkExpressionErrors(refExpressionErrors, false)) return expr;\n    while (this.state.type.postfix && !this.canInsertSemicolon()) {\n      const node = this.startNodeAt(startPos, startLoc);\n      node.operator = this.state.value;\n      node.prefix = false;\n      node.argument = expr;\n      this.checkLVal(expr, undefined, undefined, \"postfix operation\");\n      this.next();\n      expr = this.finishNode(node, \"UpdateExpression\");\n    }\n    return expr;\n  }\n\n  // Parse call, dot, and `[]`-subscript expressions.\n\n  parseExprSubscripts(refExpressionErrors: ?ExpressionErrors): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    const potentialArrowAt = this.state.potentialArrowAt;\n    const expr = this.parseExprAtom(refExpressionErrors);\n\n    if (\n      expr.type === \"ArrowFunctionExpression\" &&\n      expr.start === potentialArrowAt\n    ) {\n      return expr;\n    }\n\n    return this.parseSubscripts(expr, startPos, startLoc);\n  }\n\n  parseSubscripts(\n    base: N.Expression,\n    startPos: number,\n    startLoc: Position,\n    noCalls?: ?boolean,\n  ): N.Expression {\n    const state = {\n      optionalChainMember: false,\n      maybeAsyncArrow: this.atPossibleAsyncArrow(base),\n      stop: false,\n    };\n    do {\n      const oldMaybeInAsyncArrowHead = this.state.maybeInAsyncArrowHead;\n      if (state.maybeAsyncArrow) {\n        this.state.maybeInAsyncArrowHead = true;\n      }\n      base = this.parseSubscript(base, startPos, startLoc, noCalls, state);\n\n      // After parsing a subscript, this isn't \"async\" for sure.\n      state.maybeAsyncArrow = false;\n      this.state.maybeInAsyncArrowHead = oldMaybeInAsyncArrowHead;\n    } while (!state.stop);\n    return base;\n  }\n\n  /**\n   * @param state Set 'state.stop = true' to indicate that we should stop parsing subscripts.\n   *   state.optionalChainMember to indicate that the member is currently in OptionalChain\n   */\n  parseSubscript(\n    base: N.Expression,\n    startPos: number,\n    startLoc: Position,\n    noCalls: ?boolean,\n    state: N.ParseSubscriptState,\n  ): N.Expression {\n    if (!noCalls && this.eat(tt.doubleColon)) {\n      const node = this.startNodeAt(startPos, startLoc);\n      node.object = base;\n      node.callee = this.parseNoCallExpr();\n      state.stop = true;\n      return this.parseSubscripts(\n        this.finishNode(node, \"BindExpression\"),\n        startPos,\n        startLoc,\n        noCalls,\n      );\n    }\n    let optional = false;\n    if (this.match(tt.questionDot)) {\n      state.optionalChainMember = optional = true;\n      if (noCalls && this.lookaheadCharCode() === charCodes.leftParenthesis) {\n        state.stop = true;\n        return base;\n      }\n      this.next();\n    }\n    const computed = this.eat(tt.bracketL);\n    if (\n      (optional && !this.match(tt.parenL) && !this.match(tt.backQuote)) ||\n      computed ||\n      this.eat(tt.dot)\n    ) {\n      const node = this.startNodeAt(startPos, startLoc);\n      node.object = base;\n      node.property = computed\n        ? this.parseExpression()\n        : optional\n        ? this.parseIdentifier(true)\n        : this.parseMaybePrivateName(true);\n      node.computed = computed;\n\n      if (node.property.type === \"PrivateName\") {\n        if (node.object.type === \"Super\") {\n          this.raise(startPos, Errors.SuperPrivateField);\n        }\n        this.classScope.usePrivateName(\n          node.property.id.name,\n          node.property.start,\n        );\n      }\n\n      if (computed) {\n        this.expect(tt.bracketR);\n      }\n\n      if (state.optionalChainMember) {\n        node.optional = optional;\n        return this.finishNode(node, \"OptionalMemberExpression\");\n      } else {\n        return this.finishNode(node, \"MemberExpression\");\n      }\n    } else if (!noCalls && this.match(tt.parenL)) {\n      const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n      const oldYieldPos = this.state.yieldPos;\n      const oldAwaitPos = this.state.awaitPos;\n      this.state.maybeInArrowParameters = true;\n      this.state.yieldPos = -1;\n      this.state.awaitPos = -1;\n\n      this.next();\n\n      let node = this.startNodeAt(startPos, startLoc);\n      node.callee = base;\n\n      if (optional) {\n        node.optional = true;\n        node.arguments = this.parseCallExpressionArguments(tt.parenR, false);\n      } else {\n        node.arguments = this.parseCallExpressionArguments(\n          tt.parenR,\n          state.maybeAsyncArrow,\n          base.type === \"Import\",\n          base.type !== \"Super\",\n          node,\n        );\n      }\n      this.finishCallExpression(node, state.optionalChainMember);\n\n      if (state.maybeAsyncArrow && this.shouldParseAsyncArrow() && !optional) {\n        state.stop = true;\n\n        node = this.parseAsyncArrowFromCallExpression(\n          this.startNodeAt(startPos, startLoc),\n          node,\n        );\n        this.checkYieldAwaitInDefaultParams();\n        this.state.yieldPos = oldYieldPos;\n        this.state.awaitPos = oldAwaitPos;\n      } else {\n        this.toReferencedListDeep(node.arguments);\n\n        // We keep the old value if it isn't null, for cases like\n        //   (x = async(yield)) => {}\n        //\n        // Hi developer of the future :) If you are implementing generator\n        // arrow functions, please read the note below about \"await\" and\n        // verify if the same logic is needed for yield.\n        if (oldYieldPos !== -1) this.state.yieldPos = oldYieldPos;\n\n        // Await is trickier than yield. When parsing a possible arrow function\n        // (e.g. something starting with `async(`) we don't know if its possible\n        // parameters will actually be inside an async arrow function or if it is\n        // a normal call expression.\n        // If it ended up being a call expression, if we are in a context where\n        // await expression are disallowed (and thus \"await\" is an identifier)\n        // we must be careful not to leak this.state.awaitPos to an even outer\n        // context, where \"await\" could not be an identifier.\n        // For example, this code is valid because \"await\" isn't directly inside\n        // an async function:\n        //\n        //     async function a() {\n        //       function b(param = async (await)) {\n        //       }\n        //     }\n        //\n        if (\n          (!this.isAwaitAllowed() && !oldMaybeInArrowParameters) ||\n          oldAwaitPos !== -1\n        ) {\n          this.state.awaitPos = oldAwaitPos;\n        }\n      }\n\n      this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n\n      return node;\n    } else if (this.match(tt.backQuote)) {\n      return this.parseTaggedTemplateExpression(\n        startPos,\n        startLoc,\n        base,\n        state,\n      );\n    } else {\n      state.stop = true;\n      return base;\n    }\n  }\n\n  parseTaggedTemplateExpression(\n    startPos: number,\n    startLoc: Position,\n    base: N.Expression,\n    state: N.ParseSubscriptState,\n    typeArguments?: ?N.TsTypeParameterInstantiation,\n  ): N.TaggedTemplateExpression {\n    const node: N.TaggedTemplateExpression = this.startNodeAt(\n      startPos,\n      startLoc,\n    );\n    node.tag = base;\n    node.quasi = this.parseTemplate(true);\n    if (typeArguments) node.typeParameters = typeArguments;\n    if (state.optionalChainMember) {\n      this.raise(startPos, Errors.OptionalChainingNoTemplate);\n    }\n    return this.finishNode(node, \"TaggedTemplateExpression\");\n  }\n\n  atPossibleAsyncArrow(base: N.Expression): boolean {\n    return (\n      base.type === \"Identifier\" &&\n      base.name === \"async\" &&\n      this.state.lastTokEnd === base.end &&\n      !this.canInsertSemicolon() &&\n      // check there are no escape sequences, such as \\u{61}sync\n      base.end - base.start === 5 &&\n      base.start === this.state.potentialArrowAt\n    );\n  }\n\n  finishCallExpression<T: N.CallExpression | N.OptionalCallExpression>(\n    node: T,\n    optional: boolean,\n  ): N.Expression {\n    if (node.callee.type === \"Import\") {\n      if (node.arguments.length !== 1) {\n        this.raise(node.start, Errors.ImportCallArity);\n      } else {\n        const importArg = node.arguments[0];\n        if (importArg && importArg.type === \"SpreadElement\") {\n          this.raise(importArg.start, Errors.ImportCallSpreadArgument);\n        }\n      }\n    }\n    return this.finishNode(\n      node,\n      optional ? \"OptionalCallExpression\" : \"CallExpression\",\n    );\n  }\n\n  parseCallExpressionArguments(\n    close: TokenType,\n    possibleAsyncArrow: boolean,\n    dynamicImport?: boolean,\n    allowPlaceholder?: boolean,\n    nodeForExtra?: ?N.Node,\n  ): $ReadOnlyArray<?N.Expression> {\n    const elts = [];\n    let innerParenStart;\n    let first = true;\n    const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;\n    this.state.inFSharpPipelineDirectBody = false;\n\n    while (!this.eat(close)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma);\n        if (this.match(close)) {\n          if (dynamicImport) {\n            this.raise(\n              this.state.lastTokStart,\n              Errors.ImportCallArgumentTrailingComma,\n            );\n          }\n          if (nodeForExtra) {\n            this.addExtra(\n              nodeForExtra,\n              \"trailingComma\",\n              this.state.lastTokStart,\n            );\n          }\n          this.next();\n          break;\n        }\n      }\n\n      // we need to make sure that if this is an async arrow functions,\n      // that we don't allow inner parens inside the params\n      if (this.match(tt.parenL) && !innerParenStart) {\n        innerParenStart = this.state.start;\n      }\n\n      elts.push(\n        this.parseExprListItem(\n          false,\n          possibleAsyncArrow ? new ExpressionErrors() : undefined,\n          possibleAsyncArrow ? { start: 0 } : undefined,\n          allowPlaceholder,\n        ),\n      );\n    }\n\n    // we found an async arrow function so let's not allow any inner parens\n    if (possibleAsyncArrow && innerParenStart && this.shouldParseAsyncArrow()) {\n      this.unexpected();\n    }\n\n    this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n\n    return elts;\n  }\n\n  shouldParseAsyncArrow(): boolean {\n    return this.match(tt.arrow) && !this.canInsertSemicolon();\n  }\n\n  parseAsyncArrowFromCallExpression(\n    node: N.ArrowFunctionExpression,\n    call: N.CallExpression,\n  ): N.ArrowFunctionExpression {\n    this.expect(tt.arrow);\n    this.parseArrowExpression(\n      node,\n      call.arguments,\n      true,\n      call.extra?.trailingComma,\n    );\n    return node;\n  }\n\n  // Parse a no-call expression (like argument of `new` or `::` operators).\n\n  parseNoCallExpr(): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n    return this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);\n  }\n\n  // Parse an atomic expression — either a single token that is an\n  // expression, an expression started by a keyword like `function` or\n  // `new`, or an expression wrapped in punctuation like `()`, `[]`,\n  // or `{}`.\n\n  parseExprAtom(refExpressionErrors?: ?ExpressionErrors): N.Expression {\n    // If a division operator appears in an expression position, the\n    // tokenizer got confused, and we force it to read a regexp instead.\n    if (this.state.type === tt.slash) this.readRegexp();\n\n    const canBeArrow = this.state.potentialArrowAt === this.state.start;\n    let node;\n\n    switch (this.state.type) {\n      case tt._super:\n        node = this.startNode();\n        this.next();\n        if (\n          this.match(tt.parenL) &&\n          !this.scope.allowDirectSuper &&\n          !this.options.allowSuperOutsideMethod\n        ) {\n          this.raise(node.start, Errors.SuperNotAllowed);\n        } else if (\n          !this.scope.allowSuper &&\n          !this.options.allowSuperOutsideMethod\n        ) {\n          this.raise(node.start, Errors.UnexpectedSuper);\n        }\n\n        if (\n          !this.match(tt.parenL) &&\n          !this.match(tt.bracketL) &&\n          !this.match(tt.dot)\n        ) {\n          this.raise(node.start, Errors.UnsupportedSuper);\n        }\n\n        return this.finishNode(node, \"Super\");\n\n      case tt._import:\n        node = this.startNode();\n        this.next();\n\n        if (this.match(tt.dot)) {\n          return this.parseImportMetaProperty(node);\n        }\n\n        if (!this.match(tt.parenL)) {\n          this.raise(this.state.lastTokStart, Errors.UnsupportedImport);\n        }\n        return this.finishNode(node, \"Import\");\n      case tt._this:\n        node = this.startNode();\n        this.next();\n        return this.finishNode(node, \"ThisExpression\");\n\n      case tt.name: {\n        node = this.startNode();\n        const containsEsc = this.state.containsEsc;\n        const id = this.parseIdentifier();\n\n        if (\n          !containsEsc &&\n          id.name === \"async\" &&\n          this.match(tt._function) &&\n          !this.canInsertSemicolon()\n        ) {\n          const last = this.state.context.length - 1;\n          if (this.state.context[last] !== ct.functionStatement) {\n            // Since \"async\" is an identifier and normally identifiers\n            // can't be followed by expression, the tokenizer assumes\n            // that \"function\" starts a statement.\n            // Fixing it in the tokenizer would mean tracking not only the\n            // previous token (\"async\"), but also the one before to know\n            // its beforeExpr value.\n            // It's easier and more efficient to adjust the context here.\n            throw new Error(\"Internal error\");\n          }\n          this.state.context[last] = ct.functionExpression;\n\n          this.next();\n          return this.parseFunction(node, undefined, true);\n        } else if (\n          canBeArrow &&\n          !containsEsc &&\n          id.name === \"async\" &&\n          this.match(tt.name) &&\n          !this.canInsertSemicolon()\n        ) {\n          const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n          const oldMaybeInAsyncArrowHead = this.state.maybeInAsyncArrowHead;\n          const oldYieldPos = this.state.yieldPos;\n          const oldAwaitPos = this.state.awaitPos;\n          this.state.maybeInArrowParameters = true;\n          this.state.maybeInAsyncArrowHead = true;\n          this.state.yieldPos = -1;\n          this.state.awaitPos = -1;\n          const params = [this.parseIdentifier()];\n          this.expect(tt.arrow);\n          this.checkYieldAwaitInDefaultParams();\n          this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n          this.state.maybeInAsyncArrowHead = oldMaybeInAsyncArrowHead;\n          this.state.yieldPos = oldYieldPos;\n          this.state.awaitPos = oldAwaitPos;\n          // let foo = async bar => {};\n          this.parseArrowExpression(node, params, true);\n          return node;\n        }\n\n        if (canBeArrow && this.match(tt.arrow) && !this.canInsertSemicolon()) {\n          this.next();\n          this.parseArrowExpression(node, [id], false);\n          return node;\n        }\n\n        return id;\n      }\n\n      case tt._do: {\n        this.expectPlugin(\"doExpressions\");\n        const node = this.startNode();\n        this.next();\n        const oldLabels = this.state.labels;\n        this.state.labels = [];\n        node.body = this.parseBlock();\n        this.state.labels = oldLabels;\n        return this.finishNode(node, \"DoExpression\");\n      }\n\n      case tt.regexp: {\n        const value = this.state.value;\n        node = this.parseLiteral(value.value, \"RegExpLiteral\");\n        node.pattern = value.pattern;\n        node.flags = value.flags;\n        return node;\n      }\n\n      case tt.num:\n        return this.parseLiteral(this.state.value, \"NumericLiteral\");\n\n      case tt.bigint:\n        return this.parseLiteral(this.state.value, \"BigIntLiteral\");\n\n      case tt.string:\n        return this.parseLiteral(this.state.value, \"StringLiteral\");\n\n      case tt._null:\n        node = this.startNode();\n        this.next();\n        return this.finishNode(node, \"NullLiteral\");\n\n      case tt._true:\n      case tt._false:\n        return this.parseBooleanLiteral();\n\n      case tt.parenL:\n        return this.parseParenAndDistinguishExpression(canBeArrow);\n\n      case tt.bracketBarL:\n      case tt.bracketHashL: {\n        this.expectPlugin(\"recordAndTuple\");\n        const oldInFSharpPipelineDirectBody = this.state\n          .inFSharpPipelineDirectBody;\n        const close =\n          this.state.type === tt.bracketBarL ? tt.bracketBarR : tt.bracketR;\n        this.state.inFSharpPipelineDirectBody = false;\n        node = this.startNode();\n        this.next();\n        node.elements = this.parseExprList(\n          close,\n          true,\n          refExpressionErrors,\n          node,\n        );\n        this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n        return this.finishNode(node, \"TupleExpression\");\n      }\n      case tt.bracketL: {\n        const oldInFSharpPipelineDirectBody = this.state\n          .inFSharpPipelineDirectBody;\n        this.state.inFSharpPipelineDirectBody = false;\n        node = this.startNode();\n        this.next();\n        node.elements = this.parseExprList(\n          tt.bracketR,\n          true,\n          refExpressionErrors,\n          node,\n        );\n        if (!this.state.maybeInArrowParameters) {\n          // This could be an array pattern:\n          //   ([a: string, b: string]) => {}\n          // In this case, we don't have to call toReferencedList. We will\n          // call it, if needed, when we are sure that it is a parenthesized\n          // expression by calling toReferencedListDeep.\n          this.toReferencedList(node.elements);\n        }\n        this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n        return this.finishNode(node, \"ArrayExpression\");\n      }\n      case tt.braceBarL:\n      case tt.braceHashL: {\n        this.expectPlugin(\"recordAndTuple\");\n        const oldInFSharpPipelineDirectBody = this.state\n          .inFSharpPipelineDirectBody;\n        const close =\n          this.state.type === tt.braceBarL ? tt.braceBarR : tt.braceR;\n        this.state.inFSharpPipelineDirectBody = false;\n        const ret = this.parseObj(close, false, true, refExpressionErrors);\n        this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n        return ret;\n      }\n      case tt.braceL: {\n        const oldInFSharpPipelineDirectBody = this.state\n          .inFSharpPipelineDirectBody;\n        this.state.inFSharpPipelineDirectBody = false;\n        const ret = this.parseObj(tt.braceR, false, false, refExpressionErrors);\n        this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n        return ret;\n      }\n      case tt._function:\n        return this.parseFunctionExpression();\n\n      case tt.at:\n        this.parseDecorators();\n      // fall through\n      case tt._class:\n        node = this.startNode();\n        this.takeDecorators(node);\n        return this.parseClass(node, false);\n\n      case tt._new:\n        return this.parseNew();\n\n      case tt.backQuote:\n        return this.parseTemplate(false);\n\n      case tt.doubleColon: {\n        node = this.startNode();\n        this.next();\n        node.object = null;\n        const callee = (node.callee = this.parseNoCallExpr());\n        if (callee.type === \"MemberExpression\") {\n          return this.finishNode(node, \"BindExpression\");\n        } else {\n          throw this.raise(callee.start, Errors.UnsupportedBind);\n        }\n      }\n\n      case tt.hash: {\n        if (this.state.inPipeline) {\n          node = this.startNode();\n\n          if (\n            this.getPluginOption(\"pipelineOperator\", \"proposal\") !== \"smart\"\n          ) {\n            this.raise(node.start, Errors.PrimaryTopicRequiresSmartPipeline);\n          }\n\n          this.next();\n\n          if (!this.primaryTopicReferenceIsAllowedInCurrentTopicContext()) {\n            this.raise(node.start, Errors.PrimaryTopicNotAllowed);\n          }\n\n          this.registerTopicReference();\n          return this.finishNode(node, \"PipelinePrimaryTopicReference\");\n        }\n      }\n      // fall through\n      default:\n        throw this.unexpected();\n    }\n  }\n\n  parseBooleanLiteral(): N.BooleanLiteral {\n    const node = this.startNode();\n    node.value = this.match(tt._true);\n    this.next();\n    return this.finishNode(node, \"BooleanLiteral\");\n  }\n\n  parseMaybePrivateName(\n    isPrivateNameAllowed: boolean,\n  ): N.PrivateName | N.Identifier {\n    const isPrivate = this.match(tt.hash);\n\n    if (isPrivate) {\n      this.expectOnePlugin([\"classPrivateProperties\", \"classPrivateMethods\"]);\n      if (!isPrivateNameAllowed) {\n        this.raise(this.state.pos, Errors.UnexpectedPrivateField);\n      }\n      const node = this.startNode();\n      this.next();\n      this.assertNoSpace(\"Unexpected space between # and identifier\");\n      node.id = this.parseIdentifier(true);\n      return this.finishNode(node, \"PrivateName\");\n    } else {\n      return this.parseIdentifier(true);\n    }\n  }\n\n  parseFunctionExpression(): N.FunctionExpression | N.MetaProperty {\n    const node = this.startNode();\n\n    // We do not do parseIdentifier here because when parseFunctionExpression\n    // is called we already know that the current token is a \"name\" with the value \"function\"\n    // This will improve perf a tiny little bit as we do not do validation but more importantly\n    // here is that parseIdentifier will remove an item from the expression stack\n    // if \"function\" or \"class\" is parsed as identifier (in objects e.g.), which should not happen here.\n    let meta = this.startNode();\n    this.next();\n    meta = this.createIdentifier(meta, \"function\");\n\n    if (this.prodParam.hasYield && this.eat(tt.dot)) {\n      return this.parseMetaProperty(node, meta, \"sent\");\n    }\n    return this.parseFunction(node);\n  }\n\n  parseMetaProperty(\n    node: N.MetaProperty,\n    meta: N.Identifier,\n    propertyName: string,\n  ): N.MetaProperty {\n    node.meta = meta;\n\n    if (meta.name === \"function\" && propertyName === \"sent\") {\n      if (this.isContextual(propertyName)) {\n        this.expectPlugin(\"functionSent\");\n      } else if (!this.hasPlugin(\"functionSent\")) {\n        // The code wasn't `function.sent` but just `function.`, so a simple error is less confusing.\n        this.unexpected();\n      }\n    }\n\n    const containsEsc = this.state.containsEsc;\n\n    node.property = this.parseIdentifier(true);\n\n    if (node.property.name !== propertyName || containsEsc) {\n      this.raise(\n        node.property.start,\n        Errors.UnsupportedMetaProperty,\n        meta.name,\n        propertyName,\n      );\n    }\n\n    return this.finishNode(node, \"MetaProperty\");\n  }\n\n  parseImportMetaProperty(node: N.MetaProperty): N.MetaProperty {\n    const id = this.createIdentifier(this.startNodeAtNode(node), \"import\");\n    this.expect(tt.dot);\n\n    if (this.isContextual(\"meta\")) {\n      this.expectPlugin(\"importMeta\");\n\n      if (!this.inModule) {\n        this.raiseWithData(\n          id.start,\n          { code: \"BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED\" },\n          Errors.ImportMetaOutsideModule,\n        );\n      }\n      this.sawUnambiguousESM = true;\n    } else if (!this.hasPlugin(\"importMeta\")) {\n      this.raise(id.start, Errors.ImportCallArityLtOne);\n    }\n\n    return this.parseMetaProperty(node, id, \"meta\");\n  }\n\n  parseLiteral<T: N.Literal>(\n    value: any,\n    type: /*T[\"kind\"]*/ string,\n    startPos?: number,\n    startLoc?: Position,\n  ): T {\n    startPos = startPos || this.state.start;\n    startLoc = startLoc || this.state.startLoc;\n\n    const node = this.startNodeAt(startPos, startLoc);\n    this.addExtra(node, \"rawValue\", value);\n    this.addExtra(node, \"raw\", this.input.slice(startPos, this.state.end));\n    node.value = value;\n    this.next();\n    return this.finishNode(node, type);\n  }\n\n  parseParenAndDistinguishExpression(canBeArrow: boolean): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n\n    let val;\n    this.expect(tt.parenL);\n\n    const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n    const oldYieldPos = this.state.yieldPos;\n    const oldAwaitPos = this.state.awaitPos;\n    const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;\n    this.state.maybeInArrowParameters = true;\n    this.state.yieldPos = -1;\n    this.state.awaitPos = -1;\n    this.state.inFSharpPipelineDirectBody = false;\n\n    const innerStartPos = this.state.start;\n    const innerStartLoc = this.state.startLoc;\n    const exprList = [];\n    const refExpressionErrors = new ExpressionErrors();\n    const refNeedsArrowPos = { start: 0 };\n    let first = true;\n    let spreadStart;\n    let optionalCommaStart;\n\n    while (!this.match(tt.parenR)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma, refNeedsArrowPos.start || null);\n        if (this.match(tt.parenR)) {\n          optionalCommaStart = this.state.start;\n          break;\n        }\n      }\n\n      if (this.match(tt.ellipsis)) {\n        const spreadNodeStartPos = this.state.start;\n        const spreadNodeStartLoc = this.state.startLoc;\n        spreadStart = this.state.start;\n        exprList.push(\n          this.parseParenItem(\n            this.parseRestBinding(),\n            spreadNodeStartPos,\n            spreadNodeStartLoc,\n          ),\n        );\n\n        this.checkCommaAfterRest(charCodes.rightParenthesis);\n\n        break;\n      } else {\n        exprList.push(\n          this.parseMaybeAssign(\n            false,\n            refExpressionErrors,\n            this.parseParenItem,\n            refNeedsArrowPos,\n          ),\n        );\n      }\n    }\n\n    const innerEndPos = this.state.start;\n    const innerEndLoc = this.state.startLoc;\n    this.expect(tt.parenR);\n\n    this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n    this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n\n    let arrowNode = this.startNodeAt(startPos, startLoc);\n    if (\n      canBeArrow &&\n      this.shouldParseArrow() &&\n      (arrowNode = this.parseArrow(arrowNode))\n    ) {\n      if (!this.isAwaitAllowed() && !this.state.maybeInAsyncArrowHead) {\n        this.state.awaitPos = oldAwaitPos;\n      }\n      this.checkYieldAwaitInDefaultParams();\n      this.state.yieldPos = oldYieldPos;\n      this.state.awaitPos = oldAwaitPos;\n      for (const param of exprList) {\n        if (param.extra && param.extra.parenthesized) {\n          this.unexpected(param.extra.parenStart);\n        }\n      }\n\n      this.parseArrowExpression(arrowNode, exprList, false);\n      return arrowNode;\n    }\n\n    // We keep the old value if it isn't null, for cases like\n    //   (x = (yield)) => {}\n    if (oldYieldPos !== -1) this.state.yieldPos = oldYieldPos;\n    if (oldAwaitPos !== -1) this.state.awaitPos = oldAwaitPos;\n\n    if (!exprList.length) {\n      this.unexpected(this.state.lastTokStart);\n    }\n    if (optionalCommaStart) this.unexpected(optionalCommaStart);\n    if (spreadStart) this.unexpected(spreadStart);\n    this.checkExpressionErrors(refExpressionErrors, true);\n    if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);\n\n    this.toReferencedListDeep(exprList, /* isParenthesizedExpr */ true);\n    if (exprList.length > 1) {\n      val = this.startNodeAt(innerStartPos, innerStartLoc);\n      val.expressions = exprList;\n      this.finishNodeAt(val, \"SequenceExpression\", innerEndPos, innerEndLoc);\n    } else {\n      val = exprList[0];\n    }\n\n    if (!this.options.createParenthesizedExpressions) {\n      this.addExtra(val, \"parenthesized\", true);\n      this.addExtra(val, \"parenStart\", startPos);\n      return val;\n    }\n\n    const parenExpression = this.startNodeAt(startPos, startLoc);\n    parenExpression.expression = val;\n    this.finishNode(parenExpression, \"ParenthesizedExpression\");\n    return parenExpression;\n  }\n\n  shouldParseArrow(): boolean {\n    return !this.canInsertSemicolon();\n  }\n\n  parseArrow(node: N.ArrowFunctionExpression): ?N.ArrowFunctionExpression {\n    if (this.eat(tt.arrow)) {\n      return node;\n    }\n  }\n\n  parseParenItem(\n    node: N.Expression,\n    startPos: number, // eslint-disable-line no-unused-vars\n    startLoc: Position, // eslint-disable-line no-unused-vars\n  ): N.Expression {\n    return node;\n  }\n\n  // New's precedence is slightly tricky. It must allow its argument to\n  // be a `[]` or dot subscript expression, but not a call — at least,\n  // not without wrapping it in parentheses. Thus, it uses the noCalls\n  // argument to parseSubscripts to prevent it from consuming the\n  // argument list.\n\n  parseNew(): N.NewExpression | N.MetaProperty {\n    const node = this.startNode();\n\n    let meta = this.startNode();\n    this.next();\n    meta = this.createIdentifier(meta, \"new\");\n\n    if (this.eat(tt.dot)) {\n      const metaProp = this.parseMetaProperty(node, meta, \"target\");\n\n      if (!this.scope.inNonArrowFunction && !this.scope.inClass) {\n        let error = Errors.UnexpectedNewTarget;\n\n        if (this.hasPlugin(\"classProperties\")) {\n          error += \" or class properties\";\n        }\n\n        this.raise(metaProp.start, error);\n      }\n\n      return metaProp;\n    }\n\n    node.callee = this.parseNoCallExpr();\n\n    if (node.callee.type === \"Import\") {\n      this.raise(node.callee.start, Errors.ImportCallNotNewExpression);\n    } else if (\n      node.callee.type === \"OptionalMemberExpression\" ||\n      node.callee.type === \"OptionalCallExpression\"\n    ) {\n      this.raise(this.state.lastTokEnd, Errors.OptionalChainingNoNew);\n    } else if (this.eat(tt.questionDot)) {\n      this.raise(this.state.start, Errors.OptionalChainingNoNew);\n    }\n\n    this.parseNewArguments(node);\n    return this.finishNode(node, \"NewExpression\");\n  }\n\n  parseNewArguments(node: N.NewExpression): void {\n    if (this.eat(tt.parenL)) {\n      const args = this.parseExprList(tt.parenR);\n      this.toReferencedList(args);\n      // $FlowFixMe (parseExprList should be all non-null in this case)\n      node.arguments = args;\n    } else {\n      node.arguments = [];\n    }\n  }\n\n  // Parse template expression.\n\n  parseTemplateElement(isTagged: boolean): N.TemplateElement {\n    const elem = this.startNode();\n    if (this.state.value === null) {\n      if (!isTagged) {\n        this.raise(this.state.start + 1, Errors.InvalidEscapeSequenceTemplate);\n      }\n    }\n    elem.value = {\n      raw: this.input\n        .slice(this.state.start, this.state.end)\n        .replace(/\\r\\n?/g, \"\\n\"),\n      cooked: this.state.value,\n    };\n    this.next();\n    elem.tail = this.match(tt.backQuote);\n    return this.finishNode(elem, \"TemplateElement\");\n  }\n\n  parseTemplate(isTagged: boolean): N.TemplateLiteral {\n    const node = this.startNode();\n    this.next();\n    node.expressions = [];\n    let curElt = this.parseTemplateElement(isTagged);\n    node.quasis = [curElt];\n    while (!curElt.tail) {\n      this.expect(tt.dollarBraceL);\n      node.expressions.push(this.parseExpression());\n      this.expect(tt.braceR);\n      node.quasis.push((curElt = this.parseTemplateElement(isTagged)));\n    }\n    this.next();\n    return this.finishNode(node, \"TemplateLiteral\");\n  }\n\n  // Parse an object literal, binding pattern, or record.\n\n  parseObj<T: N.ObjectPattern | N.ObjectExpression>(\n    close: TokenType,\n    isPattern: boolean,\n    isRecord?: ?boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n  ): T {\n    const propHash: any = Object.create(null);\n    let first = true;\n    const node = this.startNode();\n\n    node.properties = [];\n    this.next();\n\n    while (!this.eat(close)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma);\n        if (this.match(close)) {\n          this.addExtra(node, \"trailingComma\", this.state.lastTokStart);\n          this.next();\n          break;\n        }\n      }\n\n      const prop = this.parseObjectMember(isPattern, refExpressionErrors);\n      if (!isPattern) {\n        // $FlowIgnore RestElement will never be returned if !isPattern\n        this.checkDuplicatedProto(prop, propHash, refExpressionErrors);\n      }\n\n      // $FlowIgnore\n      if (prop.shorthand) {\n        this.addExtra(prop, \"shorthand\", true);\n      }\n\n      node.properties.push(prop);\n    }\n\n    let type = \"ObjectExpression\";\n    if (isPattern) {\n      type = \"ObjectPattern\";\n    } else if (isRecord) {\n      type = \"RecordExpression\";\n    }\n    return this.finishNode(node, type);\n  }\n\n  isAsyncProp(prop: N.ObjectProperty): boolean {\n    return (\n      !prop.computed &&\n      prop.key.type === \"Identifier\" &&\n      prop.key.name === \"async\" &&\n      (this.match(tt.name) ||\n        this.match(tt.num) ||\n        this.match(tt.string) ||\n        this.match(tt.bracketL) ||\n        this.state.type.keyword ||\n        this.match(tt.star)) &&\n      !this.hasPrecedingLineBreak()\n    );\n  }\n\n  parseObjectMember(\n    isPattern: boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n  ): N.ObjectMember | N.SpreadElement | N.RestElement {\n    let decorators = [];\n    if (this.match(tt.at)) {\n      if (this.hasPlugin(\"decorators\")) {\n        this.raise(this.state.start, Errors.UnsupportedPropertyDecorator);\n      }\n\n      // we needn't check if decorators (stage 0) plugin is enabled since it's checked by\n      // the call to this.parseDecorator\n      while (this.match(tt.at)) {\n        decorators.push(this.parseDecorator());\n      }\n    }\n\n    const prop = this.startNode();\n    let isGenerator = false;\n    let isAsync = false;\n    let startPos;\n    let startLoc;\n\n    if (this.match(tt.ellipsis)) {\n      if (decorators.length) this.unexpected();\n      if (isPattern) {\n        this.next();\n        // Don't use parseRestBinding() as we only allow Identifier here.\n        prop.argument = this.parseIdentifier();\n        this.checkCommaAfterRest(charCodes.rightCurlyBrace);\n        return this.finishNode(prop, \"RestElement\");\n      }\n\n      return this.parseSpread();\n    }\n\n    if (decorators.length) {\n      prop.decorators = decorators;\n      decorators = [];\n    }\n\n    prop.method = false;\n\n    if (isPattern || refExpressionErrors) {\n      startPos = this.state.start;\n      startLoc = this.state.startLoc;\n    }\n\n    if (!isPattern) {\n      isGenerator = this.eat(tt.star);\n    }\n\n    const containsEsc = this.state.containsEsc;\n    this.parsePropertyName(prop, /* isPrivateNameAllowed */ false);\n\n    if (!isPattern && !containsEsc && !isGenerator && this.isAsyncProp(prop)) {\n      isAsync = true;\n      isGenerator = this.eat(tt.star);\n      this.parsePropertyName(prop, /* isPrivateNameAllowed */ false);\n    } else {\n      isAsync = false;\n    }\n\n    this.parseObjPropValue(\n      prop,\n      startPos,\n      startLoc,\n      isGenerator,\n      isAsync,\n      isPattern,\n      refExpressionErrors,\n      containsEsc,\n    );\n\n    return prop;\n  }\n\n  isGetterOrSetterMethod(prop: N.ObjectMethod, isPattern: boolean): boolean {\n    return (\n      !isPattern &&\n      !prop.computed &&\n      prop.key.type === \"Identifier\" &&\n      (prop.key.name === \"get\" || prop.key.name === \"set\") &&\n      (this.match(tt.string) || // get \"string\"() {}\n      this.match(tt.num) || // get 1() {}\n      this.match(tt.bracketL) || // get [\"string\"]() {}\n      this.match(tt.name) || // get foo() {}\n        !!this.state.type.keyword) // get debugger() {}\n    );\n  }\n\n  getGetterSetterExpectedParamCount(\n    method: N.ObjectMethod | N.ClassMethod,\n  ): number {\n    return method.kind === \"get\" ? 0 : 1;\n  }\n\n  // get methods aren't allowed to have any parameters\n  // set methods must have exactly 1 parameter which is not a rest parameter\n  checkGetterSetterParams(method: N.ObjectMethod | N.ClassMethod): void {\n    const paramCount = this.getGetterSetterExpectedParamCount(method);\n    const start = method.start;\n    if (method.params.length !== paramCount) {\n      if (method.kind === \"get\") {\n        this.raise(start, Errors.BadGetterArity);\n      } else {\n        this.raise(start, Errors.BadSetterArity);\n      }\n    }\n\n    if (\n      method.kind === \"set\" &&\n      method.params[method.params.length - 1].type === \"RestElement\"\n    ) {\n      this.raise(start, Errors.BadSetterRestParameter);\n    }\n  }\n\n  parseObjectMethod(\n    prop: N.ObjectMethod,\n    isGenerator: boolean,\n    isAsync: boolean,\n    isPattern: boolean,\n    containsEsc: boolean,\n  ): ?N.ObjectMethod {\n    if (isAsync || isGenerator || this.match(tt.parenL)) {\n      if (isPattern) this.unexpected();\n      prop.kind = \"method\";\n      prop.method = true;\n      return this.parseMethod(\n        prop,\n        isGenerator,\n        isAsync,\n        /* isConstructor */ false,\n        false,\n        \"ObjectMethod\",\n      );\n    }\n\n    if (!containsEsc && this.isGetterOrSetterMethod(prop, isPattern)) {\n      if (isGenerator || isAsync) this.unexpected();\n      prop.kind = prop.key.name;\n      this.parsePropertyName(prop, /* isPrivateNameAllowed */ false);\n      this.parseMethod(\n        prop,\n        /* isGenerator */ false,\n        /* isAsync */ false,\n        /* isConstructor */ false,\n        false,\n        \"ObjectMethod\",\n      );\n      this.checkGetterSetterParams(prop);\n      return prop;\n    }\n  }\n\n  parseObjectProperty(\n    prop: N.ObjectProperty,\n    startPos: ?number,\n    startLoc: ?Position,\n    isPattern: boolean,\n    refExpressionErrors: ?ExpressionErrors,\n  ): ?N.ObjectProperty {\n    prop.shorthand = false;\n\n    if (this.eat(tt.colon)) {\n      prop.value = isPattern\n        ? this.parseMaybeDefault(this.state.start, this.state.startLoc)\n        : this.parseMaybeAssign(false, refExpressionErrors);\n\n      return this.finishNode(prop, \"ObjectProperty\");\n    }\n\n    if (!prop.computed && prop.key.type === \"Identifier\") {\n      this.checkReservedWord(prop.key.name, prop.key.start, true, true);\n\n      if (isPattern) {\n        prop.value = this.parseMaybeDefault(\n          startPos,\n          startLoc,\n          prop.key.__clone(),\n        );\n      } else if (this.match(tt.eq) && refExpressionErrors) {\n        if (refExpressionErrors.shorthandAssign === -1) {\n          refExpressionErrors.shorthandAssign = this.state.start;\n        }\n        prop.value = this.parseMaybeDefault(\n          startPos,\n          startLoc,\n          prop.key.__clone(),\n        );\n      } else {\n        prop.value = prop.key.__clone();\n      }\n      prop.shorthand = true;\n\n      return this.finishNode(prop, \"ObjectProperty\");\n    }\n  }\n\n  parseObjPropValue(\n    prop: any,\n    startPos: ?number,\n    startLoc: ?Position,\n    isGenerator: boolean,\n    isAsync: boolean,\n    isPattern: boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n    containsEsc: boolean,\n  ): void {\n    const node =\n      this.parseObjectMethod(\n        prop,\n        isGenerator,\n        isAsync,\n        isPattern,\n        containsEsc,\n      ) ||\n      this.parseObjectProperty(\n        prop,\n        startPos,\n        startLoc,\n        isPattern,\n        refExpressionErrors,\n      );\n\n    if (!node) this.unexpected();\n\n    // $FlowFixMe\n    return node;\n  }\n\n  parsePropertyName(\n    prop: N.ObjectOrClassMember | N.ClassMember | N.TsNamedTypeElementBase,\n    isPrivateNameAllowed: boolean,\n  ): N.Expression | N.Identifier {\n    if (this.eat(tt.bracketL)) {\n      (prop: $FlowSubtype<N.ObjectOrClassMember>).computed = true;\n      prop.key = this.parseMaybeAssign();\n      this.expect(tt.bracketR);\n    } else {\n      const oldInPropertyName = this.state.inPropertyName;\n      this.state.inPropertyName = true;\n      // We check if it's valid for it to be a private name when we push it.\n      (prop: $FlowFixMe).key =\n        this.match(tt.num) || this.match(tt.string) || this.match(tt.bigint)\n          ? this.parseExprAtom()\n          : this.parseMaybePrivateName(isPrivateNameAllowed);\n\n      if (prop.key.type !== \"PrivateName\") {\n        // ClassPrivateProperty is never computed, so we don't assign in that case.\n        prop.computed = false;\n      }\n\n      this.state.inPropertyName = oldInPropertyName;\n    }\n\n    return prop.key;\n  }\n\n  // Initialize empty function node.\n\n  initFunction(node: N.BodilessFunctionOrMethodBase, isAsync: ?boolean): void {\n    node.id = null;\n    node.generator = false;\n    node.async = !!isAsync;\n  }\n\n  // Parse object or class method.\n\n  parseMethod<T: N.MethodLike>(\n    node: T,\n    isGenerator: boolean,\n    isAsync: boolean,\n    isConstructor: boolean,\n    allowDirectSuper: boolean,\n    type: string,\n    inClassScope: boolean = false,\n  ): T {\n    const oldYieldPos = this.state.yieldPos;\n    const oldAwaitPos = this.state.awaitPos;\n    this.state.yieldPos = -1;\n    this.state.awaitPos = -1;\n\n    this.initFunction(node, isAsync);\n    node.generator = !!isGenerator;\n    const allowModifiers = isConstructor; // For TypeScript parameter properties\n    this.scope.enter(\n      SCOPE_FUNCTION |\n        SCOPE_SUPER |\n        (inClassScope ? SCOPE_CLASS : 0) |\n        (allowDirectSuper ? SCOPE_DIRECT_SUPER : 0),\n    );\n    this.prodParam.enter(functionFlags(isAsync, node.generator));\n    this.parseFunctionParams((node: any), allowModifiers);\n    this.parseFunctionBodyAndFinish(node, type, true);\n    this.prodParam.exit();\n    this.scope.exit();\n\n    this.state.yieldPos = oldYieldPos;\n    this.state.awaitPos = oldAwaitPos;\n\n    return node;\n  }\n\n  // Parse arrow function expression.\n  // If the parameters are provided, they will be converted to an\n  // assignable list.\n  parseArrowExpression(\n    node: N.ArrowFunctionExpression,\n    params: ?(N.Expression[]),\n    isAsync: boolean,\n    trailingCommaPos: ?number,\n  ): N.ArrowFunctionExpression {\n    this.scope.enter(SCOPE_FUNCTION | SCOPE_ARROW);\n    this.prodParam.enter(functionFlags(isAsync, false));\n    this.initFunction(node, isAsync);\n    const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n    const oldYieldPos = this.state.yieldPos;\n    const oldAwaitPos = this.state.awaitPos;\n\n    if (params) {\n      this.state.maybeInArrowParameters = true;\n      this.setArrowFunctionParameters(node, params, trailingCommaPos);\n    }\n    this.state.maybeInArrowParameters = false;\n    this.state.yieldPos = -1;\n    this.state.awaitPos = -1;\n    this.parseFunctionBody(node, true);\n\n    this.prodParam.exit();\n    this.scope.exit();\n    this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n    this.state.yieldPos = oldYieldPos;\n    this.state.awaitPos = oldAwaitPos;\n\n    return this.finishNode(node, \"ArrowFunctionExpression\");\n  }\n\n  setArrowFunctionParameters(\n    node: N.ArrowFunctionExpression,\n    params: N.Expression[],\n    trailingCommaPos: ?number,\n  ): void {\n    node.params = this.toAssignableList(params, trailingCommaPos);\n  }\n\n  parseFunctionBodyAndFinish(\n    node: N.BodilessFunctionOrMethodBase,\n    type: string,\n    isMethod?: boolean = false,\n  ): void {\n    // $FlowIgnore (node is not bodiless if we get here)\n    this.parseFunctionBody(node, false, isMethod);\n    this.finishNode(node, type);\n  }\n\n  // Parse function body and check parameters.\n  parseFunctionBody(\n    node: N.Function,\n    allowExpression: ?boolean,\n    isMethod?: boolean = false,\n  ): void {\n    const isExpression = allowExpression && !this.match(tt.braceL);\n    const oldInParameters = this.state.inParameters;\n    this.state.inParameters = false;\n\n    if (isExpression) {\n      node.body = this.parseMaybeAssign();\n      this.checkParams(node, false, allowExpression, false);\n    } else {\n      const oldStrict = this.state.strict;\n      // Start a new scope with regard to labels\n      // flag (restore them to their old value afterwards).\n      const oldLabels = this.state.labels;\n      this.state.labels = [];\n\n      // FunctionBody[Yield, Await]:\n      //   StatementList[?Yield, ?Await, +Return] opt\n      this.prodParam.enter(this.prodParam.currentFlags() | PARAM_RETURN);\n      node.body = this.parseBlock(\n        true,\n        false,\n        // Strict mode function checks after we parse the statements in the function body.\n        (hasStrictModeDirective: boolean) => {\n          const nonSimple = !this.isSimpleParamList(node.params);\n\n          if (hasStrictModeDirective && nonSimple) {\n            // This logic is here to align the error location with the ESTree plugin.\n            const errorPos =\n              // $FlowIgnore\n              (node.kind === \"method\" || node.kind === \"constructor\") &&\n              // $FlowIgnore\n              !!node.key\n                ? node.key.end\n                : node.start;\n            this.raise(errorPos, Errors.IllegalLanguageModeDirective);\n          }\n\n          const strictModeChanged = !oldStrict && this.state.strict;\n\n          // Add the params to varDeclaredNames to ensure that an error is thrown\n          // if a let/const declaration in the function clashes with one of the params.\n          this.checkParams(\n            node,\n            !this.state.strict && !allowExpression && !isMethod && !nonSimple,\n            allowExpression,\n            strictModeChanged,\n          );\n\n          // Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'\n          if (this.state.strict && node.id) {\n            this.checkLVal(\n              node.id,\n              BIND_OUTSIDE,\n              undefined,\n              \"function name\",\n              undefined,\n              strictModeChanged,\n            );\n          }\n        },\n      );\n      this.prodParam.exit();\n      this.state.labels = oldLabels;\n    }\n\n    this.state.inParameters = oldInParameters;\n  }\n\n  isSimpleParamList(\n    params: $ReadOnlyArray<N.Pattern | N.TSParameterProperty>,\n  ): boolean {\n    for (let i = 0, len = params.length; i < len; i++) {\n      if (params[i].type !== \"Identifier\") return false;\n    }\n    return true;\n  }\n\n  checkParams(\n    node: N.Function,\n    allowDuplicates: boolean,\n    // eslint-disable-next-line no-unused-vars\n    isArrowFunction: ?boolean,\n    strictModeChanged?: boolean = true,\n  ): void {\n    // $FlowIssue\n    const nameHash: {} = Object.create(null);\n    for (let i = 0; i < node.params.length; i++) {\n      this.checkLVal(\n        node.params[i],\n        BIND_VAR,\n        allowDuplicates ? null : nameHash,\n        \"function parameter list\",\n        undefined,\n        strictModeChanged,\n      );\n    }\n  }\n\n  // Parses a comma-separated list of expressions, and returns them as\n  // an array. `close` is the token type that ends the list, and\n  // `allowEmpty` can be turned on to allow subsequent commas with\n  // nothing in between them to be parsed as `null` (which is needed\n  // for array literals).\n\n  parseExprList(\n    close: TokenType,\n    allowEmpty?: boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n    nodeForExtra?: ?N.Node,\n  ): $ReadOnlyArray<?N.Expression> {\n    const elts = [];\n    let first = true;\n\n    while (!this.eat(close)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma);\n        if (this.match(close)) {\n          if (nodeForExtra) {\n            this.addExtra(\n              nodeForExtra,\n              \"trailingComma\",\n              this.state.lastTokStart,\n            );\n          }\n          this.next();\n          break;\n        }\n      }\n\n      elts.push(this.parseExprListItem(allowEmpty, refExpressionErrors));\n    }\n    return elts;\n  }\n\n  parseExprListItem(\n    allowEmpty: ?boolean,\n    refExpressionErrors?: ?ExpressionErrors,\n    refNeedsArrowPos: ?Pos,\n    allowPlaceholder: ?boolean,\n  ): ?N.Expression {\n    let elt;\n    if (allowEmpty && this.match(tt.comma)) {\n      elt = null;\n    } else if (this.match(tt.ellipsis)) {\n      const spreadNodeStartPos = this.state.start;\n      const spreadNodeStartLoc = this.state.startLoc;\n      elt = this.parseParenItem(\n        this.parseSpread(refExpressionErrors, refNeedsArrowPos),\n        spreadNodeStartPos,\n        spreadNodeStartLoc,\n      );\n    } else if (this.match(tt.question)) {\n      this.expectPlugin(\"partialApplication\");\n      if (!allowPlaceholder) {\n        this.raise(this.state.start, Errors.UnexpectedArgumentPlaceholder);\n      }\n      const node = this.startNode();\n      this.next();\n      elt = this.finishNode(node, \"ArgumentPlaceholder\");\n    } else {\n      elt = this.parseMaybeAssign(\n        false,\n        refExpressionErrors,\n        this.parseParenItem,\n        refNeedsArrowPos,\n      );\n    }\n    return elt;\n  }\n\n  // Parse the next token as an identifier. If `liberal` is true (used\n  // when parsing properties), it will also convert keywords into\n  // identifiers.\n  // This shouldn't be used to parse the keywords of meta properties, since they\n  // are not identifiers and cannot contain escape sequences.\n\n  parseIdentifier(liberal?: boolean): N.Identifier {\n    const node = this.startNode();\n    const name = this.parseIdentifierName(node.start, liberal);\n\n    return this.createIdentifier(node, name);\n  }\n\n  createIdentifier(node: N.Identifier, name: string): N.Identifier {\n    node.name = name;\n    node.loc.identifierName = name;\n\n    return this.finishNode(node, \"Identifier\");\n  }\n\n  parseIdentifierName(pos: number, liberal?: boolean): string {\n    let name: string;\n\n    if (this.match(tt.name)) {\n      name = this.state.value;\n    } else if (this.state.type.keyword) {\n      name = this.state.type.keyword;\n\n      // `class` and `function` keywords push new context into this.context.\n      // But there is no chance to pop the context if the keyword is consumed\n      // as an identifier such as a property name.\n      // If the previous token is a dot, this does not apply because the\n      // context-managing code already ignored the keyword\n      if (\n        (name === \"class\" || name === \"function\") &&\n        (this.state.lastTokEnd !== this.state.lastTokStart + 1 ||\n          this.input.charCodeAt(this.state.lastTokStart) !== charCodes.dot)\n      ) {\n        this.state.context.pop();\n      }\n    } else {\n      throw this.unexpected();\n    }\n\n    if (liberal) {\n      // If the current token is not used as a keyword, set its type to \"tt.name\".\n      // This will prevent this.next() from throwing about unexpected escapes.\n      this.state.type = tt.name;\n    } else {\n      this.checkReservedWord(\n        name,\n        this.state.start,\n        !!this.state.type.keyword,\n        false,\n      );\n    }\n\n    this.next();\n\n    return name;\n  }\n\n  checkReservedWord(\n    word: string,\n    startLoc: number,\n    checkKeywords: boolean,\n    isBinding: boolean,\n  ): void {\n    if (this.prodParam.hasYield && word === \"yield\") {\n      this.raise(startLoc, Errors.YieldBindingIdentifier);\n      return;\n    }\n\n    if (word === \"await\") {\n      if (this.prodParam.hasAwait) {\n        this.raise(startLoc, Errors.AwaitBindingIdentifier);\n        return;\n      }\n      if (\n        this.state.awaitPos === -1 &&\n        (this.state.maybeInAsyncArrowHead || this.isAwaitAllowed())\n      ) {\n        this.state.awaitPos = this.state.start;\n      }\n    }\n\n    if (\n      this.scope.inClass &&\n      !this.scope.inNonArrowFunction &&\n      word === \"arguments\"\n    ) {\n      this.raise(startLoc, Errors.ArgumentsDisallowedInInitializer);\n      return;\n    }\n    if (checkKeywords && isKeyword(word)) {\n      this.raise(startLoc, Errors.UnexpectedKeyword, word);\n      return;\n    }\n\n    const reservedTest = !this.state.strict\n      ? isReservedWord\n      : isBinding\n      ? isStrictBindReservedWord\n      : isStrictReservedWord;\n\n    if (reservedTest(word, this.inModule)) {\n      if (!this.prodParam.hasAwait && word === \"await\") {\n        this.raise(startLoc, Errors.AwaitNotInAsyncFunction);\n      } else {\n        this.raise(startLoc, Errors.UnexpectedReservedWord, word);\n      }\n    }\n  }\n\n  isAwaitAllowed(): boolean {\n    if (this.scope.inFunction) return this.prodParam.hasAwait;\n    if (this.options.allowAwaitOutsideFunction) return true;\n    if (this.hasPlugin(\"topLevelAwait\")) {\n      return this.inModule && this.prodParam.hasAwait;\n    }\n    return false;\n  }\n\n  // Parses await expression inside async function.\n\n  parseAwait(): N.AwaitExpression {\n    const node = this.startNode();\n\n    this.next();\n\n    if (this.state.inParameters) {\n      this.raise(node.start, Errors.AwaitExpressionFormalParameter);\n    } else if (this.state.awaitPos === -1) {\n      this.state.awaitPos = node.start;\n    }\n    if (this.eat(tt.star)) {\n      this.raise(node.start, Errors.ObsoleteAwaitStar);\n    }\n\n    if (!this.scope.inFunction && !this.options.allowAwaitOutsideFunction) {\n      if (\n        this.hasPrecedingLineBreak() ||\n        // All the following expressions are ambiguous:\n        //   await + 0, await - 0, await ( 0 ), await [ 0 ], await / 0 /u, await ``\n        this.match(tt.plusMin) ||\n        this.match(tt.parenL) ||\n        this.match(tt.bracketL) ||\n        this.match(tt.backQuote) ||\n        // Sometimes the tokenizer generates tt.slash for regexps, and this is\n        // handler by parseExprAtom\n        this.match(tt.regexp) ||\n        this.match(tt.slash) ||\n        // This code could be parsed both as a modulo operator or as an intrinsic:\n        //   await %x(0)\n        (this.hasPlugin(\"v8intrinsic\") && this.match(tt.modulo))\n      ) {\n        this.ambiguousScriptDifferentAst = true;\n      } else {\n        this.sawUnambiguousESM = true;\n      }\n    }\n\n    if (!this.state.soloAwait) {\n      node.argument = this.parseMaybeUnary();\n    }\n\n    return this.finishNode(node, \"AwaitExpression\");\n  }\n\n  // Parses yield expression inside generator.\n\n  parseYield(noIn?: ?boolean): N.YieldExpression {\n    const node = this.startNode();\n\n    if (this.state.inParameters) {\n      this.raise(node.start, Errors.YieldInParameter);\n    } else if (this.state.yieldPos === -1) {\n      this.state.yieldPos = node.start;\n    }\n\n    this.next();\n    if (\n      this.match(tt.semi) ||\n      (!this.match(tt.star) && !this.state.type.startsExpr) ||\n      this.hasPrecedingLineBreak()\n    ) {\n      node.delegate = false;\n      node.argument = null;\n    } else {\n      node.delegate = this.eat(tt.star);\n      node.argument = this.parseMaybeAssign(noIn);\n    }\n    return this.finishNode(node, \"YieldExpression\");\n  }\n\n  // Validates a pipeline (for any of the pipeline Babylon plugins) at the point\n  // of the infix operator `|>`.\n\n  checkPipelineAtInfixOperator(left: N.Expression, leftStartPos: number) {\n    if (this.getPluginOption(\"pipelineOperator\", \"proposal\") === \"smart\") {\n      if (left.type === \"SequenceExpression\") {\n        // Ensure that the pipeline head is not a comma-delimited\n        // sequence expression.\n        this.raise(leftStartPos, Errors.PipelineHeadSequenceExpression);\n      }\n    }\n  }\n\n  parseSmartPipelineBody(\n    childExpression: N.Expression,\n    startPos: number,\n    startLoc: Position,\n  ): N.PipelineBody {\n    const pipelineStyle = this.checkSmartPipelineBodyStyle(childExpression);\n\n    this.checkSmartPipelineBodyEarlyErrors(\n      childExpression,\n      pipelineStyle,\n      startPos,\n    );\n\n    return this.parseSmartPipelineBodyInStyle(\n      childExpression,\n      pipelineStyle,\n      startPos,\n      startLoc,\n    );\n  }\n\n  checkSmartPipelineBodyEarlyErrors(\n    childExpression: N.Expression,\n    pipelineStyle: N.PipelineStyle,\n    startPos: number,\n  ): void {\n    if (this.match(tt.arrow)) {\n      // If the following token is invalidly `=>`, then throw a human-friendly error\n      // instead of something like 'Unexpected token, expected \";\"'.\n      throw this.raise(this.state.start, Errors.PipelineBodyNoArrow);\n    } else if (\n      pipelineStyle === \"PipelineTopicExpression\" &&\n      childExpression.type === \"SequenceExpression\"\n    ) {\n      this.raise(startPos, Errors.PipelineBodySequenceExpression);\n    }\n  }\n\n  parseSmartPipelineBodyInStyle(\n    childExpression: N.Expression,\n    pipelineStyle: N.PipelineStyle,\n    startPos: number,\n    startLoc: Position,\n  ): N.PipelineBody {\n    const bodyNode = this.startNodeAt(startPos, startLoc);\n    switch (pipelineStyle) {\n      case \"PipelineBareFunction\":\n        bodyNode.callee = childExpression;\n        break;\n      case \"PipelineBareConstructor\":\n        bodyNode.callee = childExpression.callee;\n        break;\n      case \"PipelineBareAwaitedFunction\":\n        bodyNode.callee = childExpression.argument;\n        break;\n      case \"PipelineTopicExpression\":\n        if (!this.topicReferenceWasUsedInCurrentTopicContext()) {\n          this.raise(startPos, Errors.PipelineTopicUnused);\n        }\n        bodyNode.expression = childExpression;\n        break;\n      default:\n        throw new Error(\n          `Internal @babel/parser error: Unknown pipeline style (${pipelineStyle})`,\n        );\n    }\n    return this.finishNode(bodyNode, pipelineStyle);\n  }\n\n  checkSmartPipelineBodyStyle(expression: N.Expression): N.PipelineStyle {\n    switch (expression.type) {\n      default:\n        return this.isSimpleReference(expression)\n          ? \"PipelineBareFunction\"\n          : \"PipelineTopicExpression\";\n    }\n  }\n\n  isSimpleReference(expression: N.Expression): boolean {\n    switch (expression.type) {\n      case \"MemberExpression\":\n        return (\n          !expression.computed && this.isSimpleReference(expression.object)\n        );\n      case \"Identifier\":\n        return true;\n      default:\n        return false;\n    }\n  }\n\n  // Enable topic references from outer contexts within smart pipeline bodies.\n  // The function modifies the parser's topic-context state to enable or disable\n  // the use of topic references with the smartPipelines plugin. They then run a\n  // callback, then they reset the parser to the old topic-context state that it\n  // had before the function was called.\n\n  withTopicPermittingContext<T>(callback: () => T): T {\n    const outerContextTopicState = this.state.topicContext;\n    this.state.topicContext = {\n      // Enable the use of the primary topic reference.\n      maxNumOfResolvableTopics: 1,\n      // Hide the use of any topic references from outer contexts.\n      maxTopicIndex: null,\n    };\n\n    try {\n      return callback();\n    } finally {\n      this.state.topicContext = outerContextTopicState;\n    }\n  }\n\n  // Disable topic references from outer contexts within syntax constructs\n  // such as the bodies of iteration statements.\n  // The function modifies the parser's topic-context state to enable or disable\n  // the use of topic references with the smartPipelines plugin. They then run a\n  // callback, then they reset the parser to the old topic-context state that it\n  // had before the function was called.\n\n  withTopicForbiddingContext<T>(callback: () => T): T {\n    const outerContextTopicState = this.state.topicContext;\n    this.state.topicContext = {\n      // Disable the use of the primary topic reference.\n      maxNumOfResolvableTopics: 0,\n      // Hide the use of any topic references from outer contexts.\n      maxTopicIndex: null,\n    };\n\n    try {\n      return callback();\n    } finally {\n      this.state.topicContext = outerContextTopicState;\n    }\n  }\n\n  withSoloAwaitPermittingContext<T>(callback: () => T): T {\n    const outerContextSoloAwaitState = this.state.soloAwait;\n    this.state.soloAwait = true;\n\n    try {\n      return callback();\n    } finally {\n      this.state.soloAwait = outerContextSoloAwaitState;\n    }\n  }\n\n  // Register the use of a primary topic reference (`#`) within the current\n  // topic context.\n  registerTopicReference(): void {\n    this.state.topicContext.maxTopicIndex = 0;\n  }\n\n  primaryTopicReferenceIsAllowedInCurrentTopicContext(): boolean {\n    return this.state.topicContext.maxNumOfResolvableTopics >= 1;\n  }\n\n  topicReferenceWasUsedInCurrentTopicContext(): boolean {\n    return (\n      this.state.topicContext.maxTopicIndex != null &&\n      this.state.topicContext.maxTopicIndex >= 0\n    );\n  }\n\n  parseFSharpPipelineBody(prec: number, noIn: ?boolean): N.Expression {\n    const startPos = this.state.start;\n    const startLoc = this.state.startLoc;\n\n    this.state.potentialArrowAt = this.state.start;\n    const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;\n    this.state.inFSharpPipelineDirectBody = true;\n\n    const ret = this.parseExprOp(\n      this.parseMaybeUnary(),\n      startPos,\n      startLoc,\n      prec,\n      noIn,\n    );\n\n    this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;\n\n    return ret;\n  }\n}\n","// @flow\n\nimport * as N from \"../types\";\nimport { types as tt, type TokenType } from \"../tokenizer/types\";\nimport ExpressionParser from \"./expression\";\nimport { Errors } from \"./location\";\nimport {\n  isIdentifierChar,\n  isIdentifierStart,\n  keywordRelationalOperator,\n} from \"../util/identifier\";\nimport { lineBreak } from \"../util/whitespace\";\nimport * as charCodes from \"charcodes\";\nimport {\n  BIND_CLASS,\n  BIND_LEXICAL,\n  BIND_VAR,\n  BIND_FUNCTION,\n  SCOPE_CLASS,\n  SCOPE_FUNCTION,\n  SCOPE_OTHER,\n  SCOPE_SIMPLE_CATCH,\n  SCOPE_SUPER,\n  CLASS_ELEMENT_OTHER,\n  CLASS_ELEMENT_INSTANCE_GETTER,\n  CLASS_ELEMENT_INSTANCE_SETTER,\n  CLASS_ELEMENT_STATIC_GETTER,\n  CLASS_ELEMENT_STATIC_SETTER,\n  type BindingTypes,\n} from \"../util/scopeflags\";\nimport { ExpressionErrors } from \"./util\";\nimport { PARAM, functionFlags } from \"../util/production-parameter\";\n\nconst loopLabel = { kind: \"loop\" },\n  switchLabel = { kind: \"switch\" };\n\nconst FUNC_NO_FLAGS = 0b000,\n  FUNC_STATEMENT = 0b001,\n  FUNC_HANGING_STATEMENT = 0b010,\n  FUNC_NULLABLE_ID = 0b100;\n\nexport default class StatementParser extends ExpressionParser {\n  // ### Statement parsing\n\n  // Parse a program. Initializes the parser, reads any number of\n  // statements, and wraps them in a Program node.  Optionally takes a\n  // `program` argument.  If present, the statements will be appended\n  // to its body instead of creating a new node.\n\n  parseTopLevel(file: N.File, program: N.Program): N.File {\n    program.sourceType = this.options.sourceType;\n\n    program.interpreter = this.parseInterpreterDirective();\n\n    this.parseBlockBody(program, true, true, tt.eof);\n\n    if (\n      this.inModule &&\n      !this.options.allowUndeclaredExports &&\n      this.scope.undefinedExports.size > 0\n    ) {\n      for (const [name] of Array.from(this.scope.undefinedExports)) {\n        const pos = this.scope.undefinedExports.get(name);\n        // $FlowIssue\n        this.raise(pos, Errors.ModuleExportUndefined, name);\n      }\n    }\n\n    file.program = this.finishNode(program, \"Program\");\n    file.comments = this.state.comments;\n\n    if (this.options.tokens) file.tokens = this.tokens;\n\n    return this.finishNode(file, \"File\");\n  }\n\n  // TODO\n\n  stmtToDirective(stmt: N.Statement): N.Directive {\n    const expr = stmt.expression;\n\n    const directiveLiteral = this.startNodeAt(expr.start, expr.loc.start);\n    const directive = this.startNodeAt(stmt.start, stmt.loc.start);\n\n    const raw = this.input.slice(expr.start, expr.end);\n    const val = (directiveLiteral.value = raw.slice(1, -1)); // remove quotes\n\n    this.addExtra(directiveLiteral, \"raw\", raw);\n    this.addExtra(directiveLiteral, \"rawValue\", val);\n\n    directive.value = this.finishNodeAt(\n      directiveLiteral,\n      \"DirectiveLiteral\",\n      expr.end,\n      expr.loc.end,\n    );\n\n    return this.finishNodeAt(directive, \"Directive\", stmt.end, stmt.loc.end);\n  }\n\n  parseInterpreterDirective(): N.InterpreterDirective | null {\n    if (!this.match(tt.interpreterDirective)) {\n      return null;\n    }\n\n    const node = this.startNode();\n    node.value = this.state.value;\n    this.next();\n    return this.finishNode(node, \"InterpreterDirective\");\n  }\n\n  isLet(context: ?string): boolean {\n    if (!this.isContextual(\"let\")) {\n      return false;\n    }\n    const next = this.nextTokenStart();\n    const nextCh = this.input.charCodeAt(next);\n    // For ambiguous cases, determine if a LexicalDeclaration (or only a\n    // Statement) is allowed here. If context is not empty then only a Statement\n    // is allowed. However, `let [` is an explicit negative lookahead for\n    // ExpressionStatement, so special-case it first.\n    if (nextCh === charCodes.leftSquareBracket) return true;\n    if (context) return false;\n\n    if (nextCh === charCodes.leftCurlyBrace) return true;\n\n    if (isIdentifierStart(nextCh)) {\n      let pos = next + 1;\n      while (isIdentifierChar(this.input.charCodeAt(pos))) {\n        ++pos;\n      }\n      const ident = this.input.slice(next, pos);\n      if (!keywordRelationalOperator.test(ident)) return true;\n    }\n    return false;\n  }\n\n  // Parse a single statement.\n  //\n  // If expecting a statement and finding a slash operator, parse a\n  // regular expression literal. This is to handle cases like\n  // `if (foo) /blah/.exec(foo)`, where looking at the previous token\n  // does not help.\n\n  parseStatement(context: ?string, topLevel?: boolean): N.Statement {\n    if (this.match(tt.at)) {\n      this.parseDecorators(true);\n    }\n    return this.parseStatementContent(context, topLevel);\n  }\n\n  parseStatementContent(context: ?string, topLevel: ?boolean): N.Statement {\n    let starttype = this.state.type;\n    const node = this.startNode();\n    let kind;\n\n    if (this.isLet(context)) {\n      starttype = tt._var;\n      kind = \"let\";\n    }\n\n    // Most types of statements are recognized by the keyword they\n    // start with. Many are trivial to parse, some require a bit of\n    // complexity.\n\n    switch (starttype) {\n      case tt._break:\n      case tt._continue:\n        // $FlowFixMe\n        return this.parseBreakContinueStatement(node, starttype.keyword);\n      case tt._debugger:\n        return this.parseDebuggerStatement(node);\n      case tt._do:\n        return this.parseDoStatement(node);\n      case tt._for:\n        return this.parseForStatement(node);\n      case tt._function:\n        if (this.lookaheadCharCode() === charCodes.dot) break;\n        if (context) {\n          if (this.state.strict) {\n            this.raise(this.state.start, Errors.StrictFunction);\n          } else if (context !== \"if\" && context !== \"label\") {\n            this.raise(this.state.start, Errors.SloppyFunction);\n          }\n        }\n        return this.parseFunctionStatement(node, false, !context);\n\n      case tt._class:\n        if (context) this.unexpected();\n        return this.parseClass(node, true);\n\n      case tt._if:\n        return this.parseIfStatement(node);\n      case tt._return:\n        return this.parseReturnStatement(node);\n      case tt._switch:\n        return this.parseSwitchStatement(node);\n      case tt._throw:\n        return this.parseThrowStatement(node);\n      case tt._try:\n        return this.parseTryStatement(node);\n\n      case tt._const:\n      case tt._var:\n        kind = kind || this.state.value;\n        if (context && kind !== \"var\") {\n          this.raise(this.state.start, Errors.UnexpectedLexicalDeclaration);\n        }\n        return this.parseVarStatement(node, kind);\n\n      case tt._while:\n        return this.parseWhileStatement(node);\n      case tt._with:\n        return this.parseWithStatement(node);\n      case tt.braceL:\n        return this.parseBlock();\n      case tt.semi:\n        return this.parseEmptyStatement(node);\n      case tt._export:\n      case tt._import: {\n        const nextTokenCharCode = this.lookaheadCharCode();\n        if (\n          nextTokenCharCode === charCodes.leftParenthesis ||\n          nextTokenCharCode === charCodes.dot\n        ) {\n          break;\n        }\n\n        if (!this.options.allowImportExportEverywhere && !topLevel) {\n          this.raise(this.state.start, Errors.UnexpectedImportExport);\n        }\n\n        this.next();\n\n        let result;\n        if (starttype === tt._import) {\n          result = this.parseImport(node);\n\n          if (\n            result.type === \"ImportDeclaration\" &&\n            (!result.importKind || result.importKind === \"value\")\n          ) {\n            this.sawUnambiguousESM = true;\n          }\n        } else {\n          result = this.parseExport(node);\n\n          if (\n            (result.type === \"ExportNamedDeclaration\" &&\n              (!result.exportKind || result.exportKind === \"value\")) ||\n            (result.type === \"ExportAllDeclaration\" &&\n              (!result.exportKind || result.exportKind === \"value\")) ||\n            result.type === \"ExportDefaultDeclaration\"\n          ) {\n            this.sawUnambiguousESM = true;\n          }\n        }\n\n        this.assertModuleNodeAllowed(node);\n\n        return result;\n      }\n\n      default: {\n        if (this.isAsyncFunction()) {\n          if (context) {\n            this.raise(\n              this.state.start,\n              Errors.AsyncFunctionInSingleStatementContext,\n            );\n          }\n          this.next();\n          return this.parseFunctionStatement(node, true, !context);\n        }\n      }\n    }\n\n    // If the statement does not start with a statement keyword or a\n    // brace, it's an ExpressionStatement or LabeledStatement. We\n    // simply start parsing an expression, and afterwards, if the\n    // next token is a colon and the expression was a simple\n    // Identifier node, we switch to interpreting it as a label.\n    const maybeName = this.state.value;\n    const expr = this.parseExpression();\n\n    if (\n      starttype === tt.name &&\n      expr.type === \"Identifier\" &&\n      this.eat(tt.colon)\n    ) {\n      return this.parseLabeledStatement(node, maybeName, expr, context);\n    } else {\n      return this.parseExpressionStatement(node, expr);\n    }\n  }\n\n  assertModuleNodeAllowed(node: N.Node): void {\n    if (!this.options.allowImportExportEverywhere && !this.inModule) {\n      this.raiseWithData(\n        node.start,\n        {\n          code: \"BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED\",\n        },\n        Errors.ImportOutsideModule,\n      );\n    }\n  }\n\n  takeDecorators(node: N.HasDecorators): void {\n    const decorators = this.state.decoratorStack[\n      this.state.decoratorStack.length - 1\n    ];\n    if (decorators.length) {\n      node.decorators = decorators;\n      this.resetStartLocationFromNode(node, decorators[0]);\n      this.state.decoratorStack[this.state.decoratorStack.length - 1] = [];\n    }\n  }\n\n  canHaveLeadingDecorator(): boolean {\n    return this.match(tt._class);\n  }\n\n  parseDecorators(allowExport?: boolean): void {\n    const currentContextDecorators = this.state.decoratorStack[\n      this.state.decoratorStack.length - 1\n    ];\n    while (this.match(tt.at)) {\n      const decorator = this.parseDecorator();\n      currentContextDecorators.push(decorator);\n    }\n\n    if (this.match(tt._export)) {\n      if (!allowExport) {\n        this.unexpected();\n      }\n\n      if (\n        this.hasPlugin(\"decorators\") &&\n        !this.getPluginOption(\"decorators\", \"decoratorsBeforeExport\")\n      ) {\n        this.raise(this.state.start, Errors.DecoratorExportClass);\n      }\n    } else if (!this.canHaveLeadingDecorator()) {\n      throw this.raise(this.state.start, Errors.UnexpectedLeadingDecorator);\n    }\n  }\n\n  parseDecorator(): N.Decorator {\n    this.expectOnePlugin([\"decorators-legacy\", \"decorators\"]);\n\n    const node = this.startNode();\n    this.next();\n\n    if (this.hasPlugin(\"decorators\")) {\n      // Every time a decorator class expression is evaluated, a new empty array is pushed onto the stack\n      // So that the decorators of any nested class expressions will be dealt with separately\n      this.state.decoratorStack.push([]);\n\n      const startPos = this.state.start;\n      const startLoc = this.state.startLoc;\n      let expr: N.Expression;\n\n      if (this.eat(tt.parenL)) {\n        expr = this.parseExpression();\n        this.expect(tt.parenR);\n      } else {\n        expr = this.parseIdentifier(false);\n\n        while (this.eat(tt.dot)) {\n          const node = this.startNodeAt(startPos, startLoc);\n          node.object = expr;\n          node.property = this.parseIdentifier(true);\n          node.computed = false;\n          expr = this.finishNode(node, \"MemberExpression\");\n        }\n      }\n\n      node.expression = this.parseMaybeDecoratorArguments(expr);\n      this.state.decoratorStack.pop();\n    } else {\n      node.expression = this.parseExprSubscripts();\n    }\n    return this.finishNode(node, \"Decorator\");\n  }\n\n  parseMaybeDecoratorArguments(expr: N.Expression): N.Expression {\n    if (this.eat(tt.parenL)) {\n      const node = this.startNodeAtNode(expr);\n      node.callee = expr;\n      node.arguments = this.parseCallExpressionArguments(tt.parenR, false);\n      this.toReferencedList(node.arguments);\n      return this.finishNode(node, \"CallExpression\");\n    }\n\n    return expr;\n  }\n\n  parseBreakContinueStatement(\n    node: N.BreakStatement | N.ContinueStatement,\n    keyword: string,\n  ): N.BreakStatement | N.ContinueStatement {\n    const isBreak = keyword === \"break\";\n    this.next();\n\n    if (this.isLineTerminator()) {\n      node.label = null;\n    } else {\n      node.label = this.parseIdentifier();\n      this.semicolon();\n    }\n\n    this.verifyBreakContinue(node, keyword);\n\n    return this.finishNode(\n      node,\n      isBreak ? \"BreakStatement\" : \"ContinueStatement\",\n    );\n  }\n\n  verifyBreakContinue(\n    node: N.BreakStatement | N.ContinueStatement,\n    keyword: string,\n  ) {\n    const isBreak = keyword === \"break\";\n    let i;\n    for (i = 0; i < this.state.labels.length; ++i) {\n      const lab = this.state.labels[i];\n      if (node.label == null || lab.name === node.label.name) {\n        if (lab.kind != null && (isBreak || lab.kind === \"loop\")) break;\n        if (node.label && isBreak) break;\n      }\n    }\n    if (i === this.state.labels.length) {\n      this.raise(node.start, Errors.IllegalBreakContinue, keyword);\n    }\n  }\n\n  parseDebuggerStatement(node: N.DebuggerStatement): N.DebuggerStatement {\n    this.next();\n    this.semicolon();\n    return this.finishNode(node, \"DebuggerStatement\");\n  }\n\n  parseHeaderExpression(): N.Expression {\n    this.expect(tt.parenL);\n    const val = this.parseExpression();\n    this.expect(tt.parenR);\n    return val;\n  }\n\n  parseDoStatement(node: N.DoWhileStatement): N.DoWhileStatement {\n    this.next();\n    this.state.labels.push(loopLabel);\n\n    node.body =\n      // For the smartPipelines plugin: Disable topic references from outer\n      // contexts within the loop body. They are permitted in test expressions,\n      // outside of the loop body.\n      this.withTopicForbiddingContext(() =>\n        // Parse the loop body's body.\n        this.parseStatement(\"do\"),\n      );\n\n    this.state.labels.pop();\n\n    this.expect(tt._while);\n    node.test = this.parseHeaderExpression();\n    this.eat(tt.semi);\n    return this.finishNode(node, \"DoWhileStatement\");\n  }\n\n  // Disambiguating between a `for` and a `for`/`in` or `for`/`of`\n  // loop is non-trivial. Basically, we have to parse the init `var`\n  // statement or expression, disallowing the `in` operator (see\n  // the second parameter to `parseExpression`), and then check\n  // whether the next token is `in` or `of`. When there is no init\n  // part (semicolon immediately after the opening parenthesis), it\n  // is a regular `for` loop.\n\n  parseForStatement(node: N.Node): N.ForLike {\n    this.next();\n    this.state.labels.push(loopLabel);\n\n    let awaitAt = -1;\n    if (this.isAwaitAllowed() && this.eatContextual(\"await\")) {\n      awaitAt = this.state.lastTokStart;\n    }\n    this.scope.enter(SCOPE_OTHER);\n    this.expect(tt.parenL);\n\n    if (this.match(tt.semi)) {\n      if (awaitAt > -1) {\n        this.unexpected(awaitAt);\n      }\n      return this.parseFor(node, null);\n    }\n\n    const isLet = this.isLet();\n    if (this.match(tt._var) || this.match(tt._const) || isLet) {\n      const init = this.startNode();\n      const kind = isLet ? \"let\" : this.state.value;\n      this.next();\n      this.parseVar(init, true, kind);\n      this.finishNode(init, \"VariableDeclaration\");\n\n      if (\n        (this.match(tt._in) || this.isContextual(\"of\")) &&\n        init.declarations.length === 1\n      ) {\n        return this.parseForIn(node, init, awaitAt);\n      }\n      if (awaitAt > -1) {\n        this.unexpected(awaitAt);\n      }\n      return this.parseFor(node, init);\n    }\n\n    const refExpressionErrors = new ExpressionErrors();\n    const init = this.parseExpression(true, refExpressionErrors);\n    if (this.match(tt._in) || this.isContextual(\"of\")) {\n      this.toAssignable(init);\n      const description = this.isContextual(\"of\")\n        ? \"for-of statement\"\n        : \"for-in statement\";\n      this.checkLVal(init, undefined, undefined, description);\n      return this.parseForIn(node, init, awaitAt);\n    } else {\n      this.checkExpressionErrors(refExpressionErrors, true);\n    }\n    if (awaitAt > -1) {\n      this.unexpected(awaitAt);\n    }\n    return this.parseFor(node, init);\n  }\n\n  parseFunctionStatement(\n    node: N.FunctionDeclaration,\n    isAsync?: boolean,\n    declarationPosition?: boolean,\n  ): N.FunctionDeclaration {\n    this.next();\n    return this.parseFunction(\n      node,\n      FUNC_STATEMENT | (declarationPosition ? 0 : FUNC_HANGING_STATEMENT),\n      isAsync,\n    );\n  }\n\n  parseIfStatement(node: N.IfStatement): N.IfStatement {\n    this.next();\n    node.test = this.parseHeaderExpression();\n    node.consequent = this.parseStatement(\"if\");\n    node.alternate = this.eat(tt._else) ? this.parseStatement(\"if\") : null;\n    return this.finishNode(node, \"IfStatement\");\n  }\n\n  parseReturnStatement(node: N.ReturnStatement): N.ReturnStatement {\n    if (!this.prodParam.hasReturn && !this.options.allowReturnOutsideFunction) {\n      this.raise(this.state.start, Errors.IllegalReturn);\n    }\n\n    this.next();\n\n    // In `return` (and `break`/`continue`), the keywords with\n    // optional arguments, we eagerly look for a semicolon or the\n    // possibility to insert one.\n\n    if (this.isLineTerminator()) {\n      node.argument = null;\n    } else {\n      node.argument = this.parseExpression();\n      this.semicolon();\n    }\n\n    return this.finishNode(node, \"ReturnStatement\");\n  }\n\n  parseSwitchStatement(node: N.SwitchStatement): N.SwitchStatement {\n    this.next();\n    node.discriminant = this.parseHeaderExpression();\n    const cases = (node.cases = []);\n    this.expect(tt.braceL);\n    this.state.labels.push(switchLabel);\n    this.scope.enter(SCOPE_OTHER);\n\n    // Statements under must be grouped (by label) in SwitchCase\n    // nodes. `cur` is used to keep the node that we are currently\n    // adding statements to.\n\n    let cur;\n    for (let sawDefault; !this.match(tt.braceR); ) {\n      if (this.match(tt._case) || this.match(tt._default)) {\n        const isCase = this.match(tt._case);\n        if (cur) this.finishNode(cur, \"SwitchCase\");\n        cases.push((cur = this.startNode()));\n        cur.consequent = [];\n        this.next();\n        if (isCase) {\n          cur.test = this.parseExpression();\n        } else {\n          if (sawDefault) {\n            this.raise(\n              this.state.lastTokStart,\n              Errors.MultipleDefaultsInSwitch,\n            );\n          }\n          sawDefault = true;\n          cur.test = null;\n        }\n        this.expect(tt.colon);\n      } else {\n        if (cur) {\n          cur.consequent.push(this.parseStatement(null));\n        } else {\n          this.unexpected();\n        }\n      }\n    }\n    this.scope.exit();\n    if (cur) this.finishNode(cur, \"SwitchCase\");\n    this.next(); // Closing brace\n    this.state.labels.pop();\n    return this.finishNode(node, \"SwitchStatement\");\n  }\n\n  parseThrowStatement(node: N.ThrowStatement): N.ThrowStatement {\n    this.next();\n    if (\n      lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start))\n    ) {\n      this.raise(this.state.lastTokEnd, Errors.NewlineAfterThrow);\n    }\n    node.argument = this.parseExpression();\n    this.semicolon();\n    return this.finishNode(node, \"ThrowStatement\");\n  }\n\n  parseTryStatement(node: N.TryStatement): N.TryStatement {\n    this.next();\n\n    node.block = this.parseBlock();\n    node.handler = null;\n\n    if (this.match(tt._catch)) {\n      const clause = this.startNode();\n      this.next();\n      if (this.match(tt.parenL)) {\n        this.expect(tt.parenL);\n        clause.param = this.parseBindingAtom();\n        const simple = clause.param.type === \"Identifier\";\n        this.scope.enter(simple ? SCOPE_SIMPLE_CATCH : 0);\n        this.checkLVal(clause.param, BIND_LEXICAL, null, \"catch clause\");\n        this.expect(tt.parenR);\n      } else {\n        clause.param = null;\n        this.scope.enter(SCOPE_OTHER);\n      }\n\n      clause.body =\n        // For the smartPipelines plugin: Disable topic references from outer\n        // contexts within the function body. They are permitted in function\n        // default-parameter expressions, which are part of the outer context,\n        // outside of the function body.\n        this.withTopicForbiddingContext(() =>\n          // Parse the catch clause's body.\n          this.parseBlock(false, false),\n        );\n      this.scope.exit();\n\n      node.handler = this.finishNode(clause, \"CatchClause\");\n    }\n\n    node.finalizer = this.eat(tt._finally) ? this.parseBlock() : null;\n\n    if (!node.handler && !node.finalizer) {\n      this.raise(node.start, Errors.NoCatchOrFinally);\n    }\n\n    return this.finishNode(node, \"TryStatement\");\n  }\n\n  parseVarStatement(\n    node: N.VariableDeclaration,\n    kind: \"var\" | \"let\" | \"const\",\n  ): N.VariableDeclaration {\n    this.next();\n    this.parseVar(node, false, kind);\n    this.semicolon();\n    return this.finishNode(node, \"VariableDeclaration\");\n  }\n\n  parseWhileStatement(node: N.WhileStatement): N.WhileStatement {\n    this.next();\n    node.test = this.parseHeaderExpression();\n    this.state.labels.push(loopLabel);\n\n    node.body =\n      // For the smartPipelines plugin:\n      // Disable topic references from outer contexts within the loop body.\n      // They are permitted in test expressions, outside of the loop body.\n      this.withTopicForbiddingContext(() =>\n        // Parse loop body.\n        this.parseStatement(\"while\"),\n      );\n\n    this.state.labels.pop();\n\n    return this.finishNode(node, \"WhileStatement\");\n  }\n\n  parseWithStatement(node: N.WithStatement): N.WithStatement {\n    if (this.state.strict) {\n      this.raise(this.state.start, Errors.StrictWith);\n    }\n    this.next();\n    node.object = this.parseHeaderExpression();\n\n    node.body =\n      // For the smartPipelines plugin:\n      // Disable topic references from outer contexts within the function body.\n      // They are permitted in function default-parameter expressions, which are\n      // part of the outer context, outside of the function body.\n      this.withTopicForbiddingContext(() =>\n        // Parse the statement body.\n        this.parseStatement(\"with\"),\n      );\n\n    return this.finishNode(node, \"WithStatement\");\n  }\n\n  parseEmptyStatement(node: N.EmptyStatement): N.EmptyStatement {\n    this.next();\n    return this.finishNode(node, \"EmptyStatement\");\n  }\n\n  parseLabeledStatement(\n    node: N.LabeledStatement,\n    maybeName: string,\n    expr: N.Identifier,\n    context: ?string,\n  ): N.LabeledStatement {\n    for (const label of this.state.labels) {\n      if (label.name === maybeName) {\n        this.raise(expr.start, Errors.LabelRedeclaration, maybeName);\n      }\n    }\n\n    const kind = this.state.type.isLoop\n      ? \"loop\"\n      : this.match(tt._switch)\n      ? \"switch\"\n      : null;\n    for (let i = this.state.labels.length - 1; i >= 0; i--) {\n      const label = this.state.labels[i];\n      if (label.statementStart === node.start) {\n        label.statementStart = this.state.start;\n        label.kind = kind;\n      } else {\n        break;\n      }\n    }\n\n    this.state.labels.push({\n      name: maybeName,\n      kind: kind,\n      statementStart: this.state.start,\n    });\n    node.body = this.parseStatement(\n      context\n        ? context.indexOf(\"label\") === -1\n          ? context + \"label\"\n          : context\n        : \"label\",\n    );\n\n    this.state.labels.pop();\n    node.label = expr;\n    return this.finishNode(node, \"LabeledStatement\");\n  }\n\n  parseExpressionStatement(\n    node: N.ExpressionStatement,\n    expr: N.Expression,\n  ): N.Statement {\n    node.expression = expr;\n    this.semicolon();\n    return this.finishNode(node, \"ExpressionStatement\");\n  }\n\n  // Parse a semicolon-enclosed block of statements, handling `\"use\n  // strict\"` declarations when `allowStrict` is true (used for\n  // function bodies).\n\n  parseBlock(\n    allowDirectives?: boolean = false,\n    createNewLexicalScope?: boolean = true,\n    afterBlockParse?: (hasStrictModeDirective: boolean) => void,\n  ): N.BlockStatement {\n    const node = this.startNode();\n    this.expect(tt.braceL);\n    if (createNewLexicalScope) {\n      this.scope.enter(SCOPE_OTHER);\n    }\n    this.parseBlockBody(\n      node,\n      allowDirectives,\n      false,\n      tt.braceR,\n      afterBlockParse,\n    );\n    if (createNewLexicalScope) {\n      this.scope.exit();\n    }\n    return this.finishNode(node, \"BlockStatement\");\n  }\n\n  isValidDirective(stmt: N.Statement): boolean {\n    return (\n      stmt.type === \"ExpressionStatement\" &&\n      stmt.expression.type === \"StringLiteral\" &&\n      !stmt.expression.extra.parenthesized\n    );\n  }\n\n  parseBlockBody(\n    node: N.BlockStatementLike,\n    allowDirectives: ?boolean,\n    topLevel: boolean,\n    end: TokenType,\n    afterBlockParse?: (hasStrictModeDirective: boolean) => void,\n  ): void {\n    const body = (node.body = []);\n    const directives = (node.directives = []);\n    this.parseBlockOrModuleBlockBody(\n      body,\n      allowDirectives ? directives : undefined,\n      topLevel,\n      end,\n      afterBlockParse,\n    );\n  }\n\n  // Undefined directives means that directives are not allowed.\n  parseBlockOrModuleBlockBody(\n    body: N.Statement[],\n    directives: ?(N.Directive[]),\n    topLevel: boolean,\n    end: TokenType,\n    afterBlockParse?: (hasStrictModeDirective: boolean) => void,\n  ): void {\n    const octalPositions = [];\n    const oldStrict = this.state.strict;\n    let hasStrictModeDirective = false;\n    let parsedNonDirective = false;\n\n    while (!this.match(end)) {\n      // Track octal literals that occur before a \"use strict\" directive.\n      if (!parsedNonDirective && this.state.octalPositions.length) {\n        octalPositions.push(...this.state.octalPositions);\n      }\n\n      const stmt = this.parseStatement(null, topLevel);\n\n      if (directives && !parsedNonDirective && this.isValidDirective(stmt)) {\n        const directive = this.stmtToDirective(stmt);\n        directives.push(directive);\n\n        if (!hasStrictModeDirective && directive.value.value === \"use strict\") {\n          hasStrictModeDirective = true;\n          this.setStrict(true);\n        }\n\n        continue;\n      }\n\n      parsedNonDirective = true;\n      body.push(stmt);\n    }\n\n    // Throw an error for any octal literals found before a\n    // \"use strict\" directive. Strict mode will be set at parse\n    // time for any literals that occur after the directive.\n    if (this.state.strict && octalPositions.length) {\n      for (const pos of octalPositions) {\n        this.raise(pos, Errors.StrictOctalLiteral);\n      }\n    }\n\n    if (afterBlockParse) {\n      afterBlockParse.call(this, hasStrictModeDirective);\n    }\n\n    if (!oldStrict) {\n      this.setStrict(false);\n    }\n\n    this.next();\n  }\n\n  // Parse a regular `for` loop. The disambiguation code in\n  // `parseStatement` will already have parsed the init statement or\n  // expression.\n\n  parseFor(\n    node: N.ForStatement,\n    init: ?(N.VariableDeclaration | N.Expression),\n  ): N.ForStatement {\n    node.init = init;\n    this.expect(tt.semi);\n    node.test = this.match(tt.semi) ? null : this.parseExpression();\n    this.expect(tt.semi);\n    node.update = this.match(tt.parenR) ? null : this.parseExpression();\n    this.expect(tt.parenR);\n\n    node.body =\n      // For the smartPipelines plugin: Disable topic references from outer\n      // contexts within the loop body. They are permitted in test expressions,\n      // outside of the loop body.\n      this.withTopicForbiddingContext(() =>\n        // Parse the loop body.\n        this.parseStatement(\"for\"),\n      );\n\n    this.scope.exit();\n    this.state.labels.pop();\n\n    return this.finishNode(node, \"ForStatement\");\n  }\n\n  // Parse a `for`/`in` and `for`/`of` loop, which are almost\n  // same from parser's perspective.\n\n  parseForIn(\n    node: N.ForInOf,\n    init: N.VariableDeclaration | N.AssignmentPattern,\n    awaitAt: number,\n  ): N.ForInOf {\n    const isForIn = this.match(tt._in);\n    this.next();\n\n    if (isForIn) {\n      if (awaitAt > -1) this.unexpected(awaitAt);\n    } else {\n      node.await = awaitAt > -1;\n    }\n\n    if (\n      init.type === \"VariableDeclaration\" &&\n      init.declarations[0].init != null &&\n      (!isForIn ||\n        this.state.strict ||\n        init.kind !== \"var\" ||\n        init.declarations[0].id.type !== \"Identifier\")\n    ) {\n      this.raise(\n        init.start,\n        Errors.ForInOfLoopInitializer,\n        isForIn ? \"for-in\" : \"for-of\",\n      );\n    } else if (init.type === \"AssignmentPattern\") {\n      this.raise(init.start, Errors.InvalidLhs, \"for-loop\");\n    }\n\n    node.left = init;\n    node.right = isForIn ? this.parseExpression() : this.parseMaybeAssign();\n    this.expect(tt.parenR);\n\n    node.body =\n      // For the smartPipelines plugin:\n      // Disable topic references from outer contexts within the loop body.\n      // They are permitted in test expressions, outside of the loop body.\n      this.withTopicForbiddingContext(() =>\n        // Parse loop body.\n        this.parseStatement(\"for\"),\n      );\n\n    this.scope.exit();\n    this.state.labels.pop();\n\n    return this.finishNode(node, isForIn ? \"ForInStatement\" : \"ForOfStatement\");\n  }\n\n  // Parse a list of variable declarations.\n\n  parseVar(\n    node: N.VariableDeclaration,\n    isFor: boolean,\n    kind: \"var\" | \"let\" | \"const\",\n  ): N.VariableDeclaration {\n    const declarations = (node.declarations = []);\n    const isTypescript = this.hasPlugin(\"typescript\");\n    node.kind = kind;\n    for (;;) {\n      const decl = this.startNode();\n      this.parseVarId(decl, kind);\n      if (this.eat(tt.eq)) {\n        decl.init = this.parseMaybeAssign(isFor);\n      } else {\n        if (\n          kind === \"const\" &&\n          !(this.match(tt._in) || this.isContextual(\"of\"))\n        ) {\n          // `const` with no initializer is allowed in TypeScript.\n          // It could be a declaration like `const x: number;`.\n          if (!isTypescript) {\n            this.unexpected();\n          }\n        } else if (\n          decl.id.type !== \"Identifier\" &&\n          !(isFor && (this.match(tt._in) || this.isContextual(\"of\")))\n        ) {\n          this.raise(\n            this.state.lastTokEnd,\n            Errors.DeclarationMissingInitializer,\n            \"Complex binding patterns\",\n          );\n        }\n        decl.init = null;\n      }\n      declarations.push(this.finishNode(decl, \"VariableDeclarator\"));\n      if (!this.eat(tt.comma)) break;\n    }\n    return node;\n  }\n\n  parseVarId(decl: N.VariableDeclarator, kind: \"var\" | \"let\" | \"const\"): void {\n    decl.id = this.parseBindingAtom();\n    this.checkLVal(\n      decl.id,\n      kind === \"var\" ? BIND_VAR : BIND_LEXICAL,\n      undefined,\n      \"variable declaration\",\n      kind !== \"var\",\n    );\n  }\n\n  // Parse a function declaration or literal (depending on the\n  // `isStatement` parameter).\n\n  parseFunction<T: N.NormalFunction>(\n    node: T,\n    statement?: number = FUNC_NO_FLAGS,\n    isAsync?: boolean = false,\n  ): T {\n    const isStatement = statement & FUNC_STATEMENT;\n    const isHangingStatement = statement & FUNC_HANGING_STATEMENT;\n    const requireId = !!isStatement && !(statement & FUNC_NULLABLE_ID);\n\n    this.initFunction(node, isAsync);\n\n    if (this.match(tt.star) && isHangingStatement) {\n      this.raise(this.state.start, Errors.GeneratorInSingleStatementContext);\n    }\n    node.generator = this.eat(tt.star);\n\n    if (isStatement) {\n      node.id = this.parseFunctionId(requireId);\n    }\n\n    const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;\n    const oldYieldPos = this.state.yieldPos;\n    const oldAwaitPos = this.state.awaitPos;\n    this.state.maybeInArrowParameters = false;\n    this.state.yieldPos = -1;\n    this.state.awaitPos = -1;\n    this.scope.enter(SCOPE_FUNCTION);\n    this.prodParam.enter(functionFlags(isAsync, node.generator));\n\n    if (!isStatement) {\n      node.id = this.parseFunctionId();\n    }\n\n    this.parseFunctionParams(node);\n\n    // For the smartPipelines plugin: Disable topic references from outer\n    // contexts within the function body. They are permitted in test\n    // expressions, outside of the function body.\n    this.withTopicForbiddingContext(() => {\n      // Parse the function body.\n      this.parseFunctionBodyAndFinish(\n        node,\n        isStatement ? \"FunctionDeclaration\" : \"FunctionExpression\",\n      );\n    });\n\n    this.prodParam.exit();\n    this.scope.exit();\n\n    if (isStatement && !isHangingStatement) {\n      // We need to register this _after_ parsing the function body\n      // because of TypeScript body-less function declarations,\n      // which shouldn't be added to the scope.\n      this.registerFunctionStatementId(node);\n    }\n\n    this.state.maybeInArrowParameters = oldMaybeInArrowParameters;\n    this.state.yieldPos = oldYieldPos;\n    this.state.awaitPos = oldAwaitPos;\n\n    return node;\n  }\n\n  parseFunctionId(requireId?: boolean): ?N.Identifier {\n    return requireId || this.match(tt.name) ? this.parseIdentifier() : null;\n  }\n\n  parseFunctionParams(node: N.Function, allowModifiers?: boolean): void {\n    const oldInParameters = this.state.inParameters;\n    this.state.inParameters = true;\n\n    this.expect(tt.parenL);\n    node.params = this.parseBindingList(\n      tt.parenR,\n      charCodes.rightParenthesis,\n      /* allowEmpty */ false,\n      allowModifiers,\n    );\n\n    this.state.inParameters = oldInParameters;\n    this.checkYieldAwaitInDefaultParams();\n  }\n\n  registerFunctionStatementId(node: N.Function): void {\n    if (!node.id) return;\n\n    // If it is a regular function declaration in sloppy mode, then it is\n    // subject to Annex B semantics (BIND_FUNCTION). Otherwise, the binding\n    // mode depends on properties of the current scope (see\n    // treatFunctionsAsVar).\n    this.scope.declareName(\n      node.id.name,\n      this.state.strict || node.generator || node.async\n        ? this.scope.treatFunctionsAsVar\n          ? BIND_VAR\n          : BIND_LEXICAL\n        : BIND_FUNCTION,\n      node.id.start,\n    );\n  }\n\n  // Parse a class declaration or literal (depending on the\n  // `isStatement` parameter).\n\n  parseClass<T: N.Class>(\n    node: T,\n    isStatement: /* T === ClassDeclaration */ boolean,\n    optionalId?: boolean,\n  ): T {\n    this.next();\n    this.takeDecorators(node);\n\n    // A class definition is always strict mode code.\n    const oldStrict = this.state.strict;\n    this.state.strict = true;\n\n    this.parseClassId(node, isStatement, optionalId);\n    this.parseClassSuper(node);\n    node.body = this.parseClassBody(!!node.superClass, oldStrict);\n\n    this.state.strict = oldStrict;\n\n    return this.finishNode(\n      node,\n      isStatement ? \"ClassDeclaration\" : \"ClassExpression\",\n    );\n  }\n\n  isClassProperty(): boolean {\n    return this.match(tt.eq) || this.match(tt.semi) || this.match(tt.braceR);\n  }\n\n  isClassMethod(): boolean {\n    return this.match(tt.parenL);\n  }\n\n  isNonstaticConstructor(method: N.ClassMethod | N.ClassProperty): boolean {\n    return (\n      !method.computed &&\n      !method.static &&\n      (method.key.name === \"constructor\" || // Identifier\n        method.key.value === \"constructor\") // String literal\n    );\n  }\n\n  parseClassBody(\n    constructorAllowsSuper: boolean,\n    oldStrict?: boolean,\n  ): N.ClassBody {\n    this.classScope.enter();\n\n    const state = { hadConstructor: false };\n    let decorators: N.Decorator[] = [];\n    const classBody: N.ClassBody = this.startNode();\n    classBody.body = [];\n\n    this.expect(tt.braceL);\n\n    // For the smartPipelines plugin: Disable topic references from outer\n    // contexts within the class body. They are permitted in test expressions,\n    // outside of the class body.\n    this.withTopicForbiddingContext(() => {\n      while (!this.match(tt.braceR)) {\n        if (this.eat(tt.semi)) {\n          if (decorators.length > 0) {\n            throw this.raise(this.state.lastTokEnd, Errors.DecoratorSemicolon);\n          }\n          continue;\n        }\n\n        if (this.match(tt.at)) {\n          decorators.push(this.parseDecorator());\n          continue;\n        }\n\n        const member = this.startNode();\n\n        // steal the decorators if there are any\n        if (decorators.length) {\n          member.decorators = decorators;\n          this.resetStartLocationFromNode(member, decorators[0]);\n          decorators = [];\n        }\n\n        this.parseClassMember(classBody, member, state, constructorAllowsSuper);\n\n        if (\n          member.kind === \"constructor\" &&\n          member.decorators &&\n          member.decorators.length > 0\n        ) {\n          this.raise(member.start, Errors.DecoratorConstructor);\n        }\n      }\n    });\n\n    if (!oldStrict) {\n      this.state.strict = false;\n    }\n\n    this.next();\n\n    if (decorators.length) {\n      throw this.raise(this.state.start, Errors.TrailingDecorator);\n    }\n\n    this.classScope.exit();\n\n    return this.finishNode(classBody, \"ClassBody\");\n  }\n\n  // returns true if the current identifier is a method/field name,\n  // false if it is a modifier\n  parseClassMemberFromModifier(\n    classBody: N.ClassBody,\n    member: N.ClassMember,\n  ): boolean {\n    const containsEsc = this.state.containsEsc;\n    const key = this.parseIdentifier(true); // eats the modifier\n\n    if (this.isClassMethod()) {\n      const method: N.ClassMethod = (member: any);\n\n      // a method named like the modifier\n      method.kind = \"method\";\n      method.computed = false;\n      method.key = key;\n      method.static = false;\n      this.pushClassMethod(\n        classBody,\n        method,\n        false,\n        false,\n        /* isConstructor */ false,\n        false,\n      );\n      return true;\n    } else if (this.isClassProperty()) {\n      const prop: N.ClassProperty = (member: any);\n\n      // a property named like the modifier\n      prop.computed = false;\n      prop.key = key;\n      prop.static = false;\n      classBody.body.push(this.parseClassProperty(prop));\n      return true;\n    } else if (containsEsc) {\n      throw this.unexpected();\n    }\n\n    return false;\n  }\n\n  parseClassMember(\n    classBody: N.ClassBody,\n    member: N.ClassMember,\n    state: { hadConstructor: boolean },\n    constructorAllowsSuper: boolean,\n  ): void {\n    const isStatic = this.isContextual(\"static\");\n\n    if (isStatic && this.parseClassMemberFromModifier(classBody, member)) {\n      // a class element named 'static'\n      return;\n    }\n\n    this.parseClassMemberWithIsStatic(\n      classBody,\n      member,\n      state,\n      isStatic,\n      constructorAllowsSuper,\n    );\n  }\n\n  parseClassMemberWithIsStatic(\n    classBody: N.ClassBody,\n    member: N.ClassMember,\n    state: { hadConstructor: boolean },\n    isStatic: boolean,\n    constructorAllowsSuper: boolean,\n  ) {\n    const publicMethod: $FlowSubtype<N.ClassMethod> = member;\n    const privateMethod: $FlowSubtype<N.ClassPrivateMethod> = member;\n    const publicProp: $FlowSubtype<N.ClassMethod> = member;\n    const privateProp: $FlowSubtype<N.ClassPrivateMethod> = member;\n\n    const method: typeof publicMethod | typeof privateMethod = publicMethod;\n    const publicMember: typeof publicMethod | typeof publicProp = publicMethod;\n\n    member.static = isStatic;\n\n    if (this.eat(tt.star)) {\n      // a generator\n      method.kind = \"method\";\n      this.parseClassPropertyName(method);\n\n      if (method.key.type === \"PrivateName\") {\n        // Private generator method\n        this.pushClassPrivateMethod(classBody, privateMethod, true, false);\n        return;\n      }\n\n      if (this.isNonstaticConstructor(publicMethod)) {\n        this.raise(publicMethod.key.start, Errors.ConstructorIsGenerator);\n      }\n\n      this.pushClassMethod(\n        classBody,\n        publicMethod,\n        true,\n        false,\n        /* isConstructor */ false,\n        false,\n      );\n\n      return;\n    }\n\n    const containsEsc = this.state.containsEsc;\n    const key = this.parseClassPropertyName(member);\n    const isPrivate = key.type === \"PrivateName\";\n    // Check the key is not a computed expression or string literal.\n    const isSimple = key.type === \"Identifier\";\n    const maybeQuestionTokenStart = this.state.start;\n\n    this.parsePostMemberNameModifiers(publicMember);\n\n    if (this.isClassMethod()) {\n      method.kind = \"method\";\n\n      if (isPrivate) {\n        this.pushClassPrivateMethod(classBody, privateMethod, false, false);\n        return;\n      }\n\n      // a normal method\n      const isConstructor = this.isNonstaticConstructor(publicMethod);\n      let allowsDirectSuper = false;\n      if (isConstructor) {\n        publicMethod.kind = \"constructor\";\n\n        // TypeScript allows multiple overloaded constructor declarations.\n        if (state.hadConstructor && !this.hasPlugin(\"typescript\")) {\n          this.raise(key.start, Errors.DuplicateConstructor);\n        }\n        state.hadConstructor = true;\n        allowsDirectSuper = constructorAllowsSuper;\n      }\n\n      this.pushClassMethod(\n        classBody,\n        publicMethod,\n        false,\n        false,\n        isConstructor,\n        allowsDirectSuper,\n      );\n    } else if (this.isClassProperty()) {\n      if (isPrivate) {\n        this.pushClassPrivateProperty(classBody, privateProp);\n      } else {\n        this.pushClassProperty(classBody, publicProp);\n      }\n    } else if (\n      isSimple &&\n      key.name === \"async\" &&\n      !containsEsc &&\n      !this.isLineTerminator()\n    ) {\n      // an async method\n      const isGenerator = this.eat(tt.star);\n\n      if (publicMember.optional) {\n        this.unexpected(maybeQuestionTokenStart);\n      }\n\n      method.kind = \"method\";\n      // The so-called parsed name would have been \"async\": get the real name.\n      this.parseClassPropertyName(method);\n      this.parsePostMemberNameModifiers(publicMember);\n\n      if (method.key.type === \"PrivateName\") {\n        // private async method\n        this.pushClassPrivateMethod(\n          classBody,\n          privateMethod,\n          isGenerator,\n          true,\n        );\n      } else {\n        if (this.isNonstaticConstructor(publicMethod)) {\n          this.raise(publicMethod.key.start, Errors.ConstructorIsAsync);\n        }\n\n        this.pushClassMethod(\n          classBody,\n          publicMethod,\n          isGenerator,\n          true,\n          /* isConstructor */ false,\n          false,\n        );\n      }\n    } else if (\n      isSimple &&\n      (key.name === \"get\" || key.name === \"set\") &&\n      !containsEsc &&\n      !(this.match(tt.star) && this.isLineTerminator())\n    ) {\n      // `get\\n*` is an uninitialized property named 'get' followed by a generator.\n      // a getter or setter\n      method.kind = key.name;\n      // The so-called parsed name would have been \"get/set\": get the real name.\n      this.parseClassPropertyName(publicMethod);\n\n      if (method.key.type === \"PrivateName\") {\n        // private getter/setter\n        this.pushClassPrivateMethod(classBody, privateMethod, false, false);\n      } else {\n        if (this.isNonstaticConstructor(publicMethod)) {\n          this.raise(publicMethod.key.start, Errors.ConstructorIsAccessor);\n        }\n        this.pushClassMethod(\n          classBody,\n          publicMethod,\n          false,\n          false,\n          /* isConstructor */ false,\n          false,\n        );\n      }\n\n      this.checkGetterSetterParams(publicMethod);\n    } else if (this.isLineTerminator()) {\n      // an uninitialized class property (due to ASI, since we don't otherwise recognize the next token)\n      if (isPrivate) {\n        this.pushClassPrivateProperty(classBody, privateProp);\n      } else {\n        this.pushClassProperty(classBody, publicProp);\n      }\n    } else {\n      this.unexpected();\n    }\n  }\n\n  parseClassPropertyName(member: N.ClassMember): N.Expression | N.Identifier {\n    const key = this.parsePropertyName(member, /* isPrivateNameAllowed */ true);\n\n    if (\n      !member.computed &&\n      member.static &&\n      ((key: $FlowSubtype<N.Identifier>).name === \"prototype\" ||\n        (key: $FlowSubtype<N.StringLiteral>).value === \"prototype\")\n    ) {\n      this.raise(key.start, Errors.StaticPrototype);\n    }\n\n    if (key.type === \"PrivateName\" && key.id.name === \"constructor\") {\n      this.raise(key.start, Errors.ConstructorClassPrivateField);\n    }\n\n    return key;\n  }\n\n  pushClassProperty(classBody: N.ClassBody, prop: N.ClassProperty) {\n    if (\n      !prop.computed &&\n      (prop.key.name === \"constructor\" || prop.key.value === \"constructor\")\n    ) {\n      // Non-computed field, which is either an identifier named \"constructor\"\n      // or a string literal named \"constructor\"\n      this.raise(prop.key.start, Errors.ConstructorClassField);\n    }\n\n    classBody.body.push(this.parseClassProperty(prop));\n  }\n\n  pushClassPrivateProperty(\n    classBody: N.ClassBody,\n    prop: N.ClassPrivateProperty,\n  ) {\n    this.expectPlugin(\"classPrivateProperties\", prop.key.start);\n\n    const node = this.parseClassPrivateProperty(prop);\n    classBody.body.push(node);\n\n    this.classScope.declarePrivateName(\n      node.key.id.name,\n      CLASS_ELEMENT_OTHER,\n      node.key.start,\n    );\n  }\n\n  pushClassMethod(\n    classBody: N.ClassBody,\n    method: N.ClassMethod,\n    isGenerator: boolean,\n    isAsync: boolean,\n    isConstructor: boolean,\n    allowsDirectSuper: boolean,\n  ): void {\n    classBody.body.push(\n      this.parseMethod(\n        method,\n        isGenerator,\n        isAsync,\n        isConstructor,\n        allowsDirectSuper,\n        \"ClassMethod\",\n        true,\n      ),\n    );\n  }\n\n  pushClassPrivateMethod(\n    classBody: N.ClassBody,\n    method: N.ClassPrivateMethod,\n    isGenerator: boolean,\n    isAsync: boolean,\n  ): void {\n    this.expectPlugin(\"classPrivateMethods\", method.key.start);\n\n    const node = this.parseMethod(\n      method,\n      isGenerator,\n      isAsync,\n      /* isConstructor */ false,\n      false,\n      \"ClassPrivateMethod\",\n      true,\n    );\n    classBody.body.push(node);\n\n    const kind =\n      node.kind === \"get\"\n        ? node.static\n          ? CLASS_ELEMENT_STATIC_GETTER\n          : CLASS_ELEMENT_INSTANCE_GETTER\n        : node.kind === \"set\"\n        ? node.static\n          ? CLASS_ELEMENT_STATIC_SETTER\n          : CLASS_ELEMENT_INSTANCE_SETTER\n        : CLASS_ELEMENT_OTHER;\n    this.classScope.declarePrivateName(node.key.id.name, kind, node.key.start);\n  }\n\n  // Overridden in typescript.js\n  parsePostMemberNameModifiers(\n    // eslint-disable-next-line no-unused-vars\n    methodOrProp: N.ClassMethod | N.ClassProperty,\n  ): void {}\n\n  // Overridden in typescript.js\n  parseAccessModifier(): ?N.Accessibility {\n    return undefined;\n  }\n\n  parseClassPrivateProperty(\n    node: N.ClassPrivateProperty,\n  ): N.ClassPrivateProperty {\n    this.scope.enter(SCOPE_CLASS | SCOPE_SUPER);\n    // [In] production parameter is tracked in parseMaybeAssign\n    this.prodParam.enter(PARAM);\n\n    node.value = this.eat(tt.eq) ? this.parseMaybeAssign() : null;\n    this.semicolon();\n    this.prodParam.exit();\n\n    this.scope.exit();\n\n    return this.finishNode(node, \"ClassPrivateProperty\");\n  }\n\n  parseClassProperty(node: N.ClassProperty): N.ClassProperty {\n    if (!node.typeAnnotation) {\n      this.expectPlugin(\"classProperties\");\n    }\n\n    this.scope.enter(SCOPE_CLASS | SCOPE_SUPER);\n    // [In] production parameter is tracked in parseMaybeAssign\n    this.prodParam.enter(PARAM);\n\n    if (this.match(tt.eq)) {\n      this.expectPlugin(\"classProperties\");\n      this.next();\n      node.value = this.parseMaybeAssign();\n    } else {\n      node.value = null;\n    }\n    this.semicolon();\n\n    this.prodParam.exit();\n    this.scope.exit();\n\n    return this.finishNode(node, \"ClassProperty\");\n  }\n\n  parseClassId(\n    node: N.Class,\n    isStatement: boolean,\n    optionalId: ?boolean,\n    bindingType: BindingTypes = BIND_CLASS,\n  ): void {\n    if (this.match(tt.name)) {\n      node.id = this.parseIdentifier();\n      if (isStatement) {\n        this.checkLVal(node.id, bindingType, undefined, \"class name\");\n      }\n    } else {\n      if (optionalId || !isStatement) {\n        node.id = null;\n      } else {\n        this.unexpected(null, Errors.MissingClassName);\n      }\n    }\n  }\n\n  parseClassSuper(node: N.Class): void {\n    node.superClass = this.eat(tt._extends) ? this.parseExprSubscripts() : null;\n  }\n\n  // Parses module export declaration.\n\n  parseExport(node: N.Node): N.AnyExport {\n    const hasDefault = this.maybeParseExportDefaultSpecifier(node);\n    const parseAfterDefault = !hasDefault || this.eat(tt.comma);\n    const hasStar = parseAfterDefault && this.eatExportStar(node);\n    const hasNamespace =\n      hasStar && this.maybeParseExportNamespaceSpecifier(node);\n    const parseAfterNamespace =\n      parseAfterDefault && (!hasNamespace || this.eat(tt.comma));\n    const isFromRequired = hasDefault || hasStar;\n\n    if (hasStar && !hasNamespace) {\n      if (hasDefault) this.unexpected();\n      this.parseExportFrom(node, true);\n\n      return this.finishNode(node, \"ExportAllDeclaration\");\n    }\n\n    const hasSpecifiers = this.maybeParseExportNamedSpecifiers(node);\n\n    if (\n      (hasDefault && parseAfterDefault && !hasStar && !hasSpecifiers) ||\n      (hasNamespace && parseAfterNamespace && !hasSpecifiers)\n    ) {\n      throw this.unexpected(null, tt.braceL);\n    }\n\n    let hasDeclaration;\n    if (isFromRequired || hasSpecifiers) {\n      hasDeclaration = false;\n      this.parseExportFrom(node, isFromRequired);\n    } else {\n      hasDeclaration = this.maybeParseExportDeclaration(node);\n    }\n\n    if (isFromRequired || hasSpecifiers || hasDeclaration) {\n      this.checkExport(node, true, false, !!node.source);\n      return this.finishNode(node, \"ExportNamedDeclaration\");\n    }\n\n    if (this.eat(tt._default)) {\n      // export default ...\n      node.declaration = this.parseExportDefaultExpression();\n      this.checkExport(node, true, true);\n\n      return this.finishNode(node, \"ExportDefaultDeclaration\");\n    }\n\n    throw this.unexpected(null, tt.braceL);\n  }\n\n  // eslint-disable-next-line no-unused-vars\n  eatExportStar(node: N.Node): boolean {\n    return this.eat(tt.star);\n  }\n\n  maybeParseExportDefaultSpecifier(node: N.Node): boolean {\n    if (this.isExportDefaultSpecifier()) {\n      // export defaultObj ...\n      this.expectPlugin(\"exportDefaultFrom\");\n      const specifier = this.startNode();\n      specifier.exported = this.parseIdentifier(true);\n      node.specifiers = [this.finishNode(specifier, \"ExportDefaultSpecifier\")];\n      return true;\n    }\n    return false;\n  }\n\n  maybeParseExportNamespaceSpecifier(node: N.Node): boolean {\n    if (this.isContextual(\"as\")) {\n      if (!node.specifiers) node.specifiers = [];\n\n      const specifier = this.startNodeAt(\n        this.state.lastTokStart,\n        this.state.lastTokStartLoc,\n      );\n\n      this.next();\n\n      specifier.exported = this.parseIdentifier(true);\n      node.specifiers.push(\n        this.finishNode(specifier, \"ExportNamespaceSpecifier\"),\n      );\n      return true;\n    }\n    return false;\n  }\n\n  maybeParseExportNamedSpecifiers(node: N.Node): boolean {\n    if (this.match(tt.braceL)) {\n      if (!node.specifiers) node.specifiers = [];\n      node.specifiers.push(...this.parseExportSpecifiers());\n\n      node.source = null;\n      node.declaration = null;\n\n      return true;\n    }\n    return false;\n  }\n\n  maybeParseExportDeclaration(node: N.Node): boolean {\n    if (this.shouldParseExportDeclaration()) {\n      if (this.isContextual(\"async\")) {\n        const next = this.nextTokenStart();\n\n        // export async;\n        if (!this.isUnparsedContextual(next, \"function\")) {\n          this.unexpected(next, tt._function);\n        }\n      }\n\n      node.specifiers = [];\n      node.source = null;\n      node.declaration = this.parseExportDeclaration(node);\n\n      return true;\n    }\n    return false;\n  }\n\n  isAsyncFunction(): boolean {\n    if (!this.isContextual(\"async\")) return false;\n    const next = this.nextTokenStart();\n    return (\n      !lineBreak.test(this.input.slice(this.state.pos, next)) &&\n      this.isUnparsedContextual(next, \"function\")\n    );\n  }\n\n  parseExportDefaultExpression(): N.Expression | N.Declaration {\n    const expr = this.startNode();\n\n    const isAsync = this.isAsyncFunction();\n\n    if (this.match(tt._function) || isAsync) {\n      this.next();\n      if (isAsync) {\n        this.next();\n      }\n\n      return this.parseFunction(\n        expr,\n        FUNC_STATEMENT | FUNC_NULLABLE_ID,\n        isAsync,\n      );\n    } else if (this.match(tt._class)) {\n      return this.parseClass(expr, true, true);\n    } else if (this.match(tt.at)) {\n      if (\n        this.hasPlugin(\"decorators\") &&\n        this.getPluginOption(\"decorators\", \"decoratorsBeforeExport\")\n      ) {\n        this.raise(this.state.start, Errors.DecoratorBeforeExport);\n      }\n      this.parseDecorators(false);\n      return this.parseClass(expr, true, true);\n    } else if (this.match(tt._const) || this.match(tt._var) || this.isLet()) {\n      throw this.raise(this.state.start, Errors.UnsupportedDefaultExport);\n    } else {\n      const res = this.parseMaybeAssign();\n      this.semicolon();\n      return res;\n    }\n  }\n\n  // eslint-disable-next-line no-unused-vars\n  parseExportDeclaration(node: N.ExportNamedDeclaration): ?N.Declaration {\n    return this.parseStatement(null);\n  }\n\n  isExportDefaultSpecifier(): boolean {\n    if (this.match(tt.name)) {\n      return this.state.value !== \"async\" && this.state.value !== \"let\";\n    }\n\n    if (!this.match(tt._default)) {\n      return false;\n    }\n\n    const next = this.nextTokenStart();\n    return (\n      this.input.charCodeAt(next) === charCodes.comma ||\n      this.isUnparsedContextual(next, \"from\")\n    );\n  }\n\n  parseExportFrom(node: N.ExportNamedDeclaration, expect?: boolean): void {\n    if (this.eatContextual(\"from\")) {\n      node.source = this.parseImportSource();\n      this.checkExport(node);\n    } else {\n      if (expect) {\n        this.unexpected();\n      } else {\n        node.source = null;\n      }\n    }\n\n    this.semicolon();\n  }\n\n  shouldParseExportDeclaration(): boolean {\n    if (this.match(tt.at)) {\n      this.expectOnePlugin([\"decorators\", \"decorators-legacy\"]);\n      if (this.hasPlugin(\"decorators\")) {\n        if (this.getPluginOption(\"decorators\", \"decoratorsBeforeExport\")) {\n          this.unexpected(this.state.start, Errors.DecoratorBeforeExport);\n        } else {\n          return true;\n        }\n      }\n    }\n\n    return (\n      this.state.type.keyword === \"var\" ||\n      this.state.type.keyword === \"const\" ||\n      this.state.type.keyword === \"function\" ||\n      this.state.type.keyword === \"class\" ||\n      this.isLet() ||\n      this.isAsyncFunction()\n    );\n  }\n\n  checkExport(\n    node: N.ExportNamedDeclaration,\n    checkNames?: boolean,\n    isDefault?: boolean,\n    isFrom?: boolean,\n  ): void {\n    if (checkNames) {\n      // Check for duplicate exports\n      if (isDefault) {\n        // Default exports\n        this.checkDuplicateExports(node, \"default\");\n      } else if (node.specifiers && node.specifiers.length) {\n        // Named exports\n        for (const specifier of node.specifiers) {\n          this.checkDuplicateExports(specifier, specifier.exported.name);\n          // $FlowIgnore\n          if (!isFrom && specifier.local) {\n            // check for keywords used as local names\n            this.checkReservedWord(\n              specifier.local.name,\n              specifier.local.start,\n              true,\n              false,\n            );\n            // check if export is defined\n            // $FlowIgnore\n            this.scope.checkLocalExport(specifier.local);\n          }\n        }\n      } else if (node.declaration) {\n        // Exported declarations\n        if (\n          node.declaration.type === \"FunctionDeclaration\" ||\n          node.declaration.type === \"ClassDeclaration\"\n        ) {\n          const id = node.declaration.id;\n          if (!id) throw new Error(\"Assertion failure\");\n\n          this.checkDuplicateExports(node, id.name);\n        } else if (node.declaration.type === \"VariableDeclaration\") {\n          for (const declaration of node.declaration.declarations) {\n            this.checkDeclaration(declaration.id);\n          }\n        }\n      }\n    }\n\n    const currentContextDecorators = this.state.decoratorStack[\n      this.state.decoratorStack.length - 1\n    ];\n    if (currentContextDecorators.length) {\n      const isClass =\n        node.declaration &&\n        (node.declaration.type === \"ClassDeclaration\" ||\n          node.declaration.type === \"ClassExpression\");\n      if (!node.declaration || !isClass) {\n        throw this.raise(node.start, Errors.UnsupportedDecoratorExport);\n      }\n      this.takeDecorators(node.declaration);\n    }\n  }\n\n  checkDeclaration(node: N.Pattern | N.ObjectProperty): void {\n    if (node.type === \"Identifier\") {\n      this.checkDuplicateExports(node, node.name);\n    } else if (node.type === \"ObjectPattern\") {\n      for (const prop of node.properties) {\n        this.checkDeclaration(prop);\n      }\n    } else if (node.type === \"ArrayPattern\") {\n      for (const elem of node.elements) {\n        if (elem) {\n          this.checkDeclaration(elem);\n        }\n      }\n    } else if (node.type === \"ObjectProperty\") {\n      this.checkDeclaration(node.value);\n    } else if (node.type === \"RestElement\") {\n      this.checkDeclaration(node.argument);\n    } else if (node.type === \"AssignmentPattern\") {\n      this.checkDeclaration(node.left);\n    }\n  }\n\n  checkDuplicateExports(\n    node:\n      | N.Identifier\n      | N.ExportNamedDeclaration\n      | N.ExportSpecifier\n      | N.ExportDefaultSpecifier,\n    name: string,\n  ): void {\n    if (this.state.exportedIdentifiers.indexOf(name) > -1) {\n      this.raise(\n        node.start,\n        name === \"default\"\n          ? Errors.DuplicateDefaultExport\n          : Errors.DuplicateExport,\n        name,\n      );\n    }\n    this.state.exportedIdentifiers.push(name);\n  }\n\n  // Parses a comma-separated list of module exports.\n\n  parseExportSpecifiers(): Array<N.ExportSpecifier> {\n    const nodes = [];\n    let first = true;\n\n    // export { x, y as z } [from '...']\n    this.expect(tt.braceL);\n\n    while (!this.eat(tt.braceR)) {\n      if (first) {\n        first = false;\n      } else {\n        this.expect(tt.comma);\n        if (this.eat(tt.braceR)) break;\n      }\n\n      const node = this.startNode();\n      node.local = this.parseIdentifier(true);\n      node.exported = this.eatContextual(\"as\")\n        ? this.parseIdentifier(true)\n        : node.local.__clone();\n      nodes.push(this.finishNode(node, \"ExportSpecifier\"));\n    }\n\n    return nodes;\n  }\n\n  // Parses import declaration.\n\n  parseImport(node: N.Node): N.AnyImport {\n    // import '...'\n    node.specifiers = [];\n    if (!this.match(tt.string)) {\n      const hasDefault = this.maybeParseDefaultImportSpecifier(node);\n      const parseNext = !hasDefault || this.eat(tt.comma);\n      const hasStar = parseNext && this.maybeParseStarImportSpecifier(node);\n      if (parseNext && !hasStar) this.parseNamedImportSpecifiers(node);\n      this.expectContextual(\"from\");\n    }\n    node.source = this.parseImportSource();\n    this.semicolon();\n    return this.finishNode(node, \"ImportDeclaration\");\n  }\n\n  parseImportSource(): N.StringLiteral {\n    if (!this.match(tt.string)) this.unexpected();\n    return this.parseExprAtom();\n  }\n\n  // eslint-disable-next-line no-unused-vars\n  shouldParseDefaultImport(node: N.ImportDeclaration): boolean {\n    return this.match(tt.name);\n  }\n\n  parseImportSpecifierLocal(\n    node: N.ImportDeclaration,\n    specifier: N.Node,\n    type: string,\n    contextDescription: string,\n  ): void {\n    specifier.local = this.parseIdentifier();\n    this.checkLVal(\n      specifier.local,\n      BIND_LEXICAL,\n      undefined,\n      contextDescription,\n    );\n    node.specifiers.push(this.finishNode(specifier, type));\n  }\n\n  maybeParseDefaultImportSpecifier(node: N.ImportDeclaration): boolean {\n    if (this.shouldParseDefaultImport(node)) {\n      // import defaultObj, { x, y as z } from '...'\n      this.parseImportSpecifierLocal(\n        node,\n        this.startNode(),\n        \"ImportDefaultSpecifier\",\n        \"default import specifier\",\n      );\n      return true;\n    }\n    return false;\n  }\n\n  maybeParseStarImportSpecifier(node: N.ImportDeclaration): boolean {\n    if (this.match(tt.star)) {\n      const specifier = this.startNode();\n      this.next();\n      this.expectContextual(\"as\");\n\n      this.parseImportSpecifierLocal(\n        node,\n        specifier,\n        \"ImportNamespaceSpecifier\",\n        \"import namespace specifier\",\n      );\n      return true;\n    }\n    return false;\n  }\n\n  parseNamedImportSpecifiers(node: N.ImportDeclaration) {\n    let first = true;\n    this.expect(tt.braceL);\n    while (!this.eat(tt.braceR)) {\n      if (first) {\n        first = false;\n      } else {\n        // Detect an attempt to deep destructure\n        if (this.eat(tt.colon)) {\n          throw this.raise(this.state.start, Errors.DestructureNamedImport);\n        }\n\n        this.expect(tt.comma);\n        if (this.eat(tt.braceR)) break;\n      }\n\n      this.parseImportSpecifier(node);\n    }\n  }\n\n  parseImportSpecifier(node: N.ImportDeclaration): void {\n    const specifier = this.startNode();\n    specifier.imported = this.parseIdentifier(true);\n    if (this.eatContextual(\"as\")) {\n      specifier.local = this.parseIdentifier();\n    } else {\n      this.checkReservedWord(\n        specifier.imported.name,\n        specifier.start,\n        true,\n        true,\n      );\n      specifier.local = specifier.imported.__clone();\n    }\n    this.checkLVal(\n      specifier.local,\n      BIND_LEXICAL,\n      undefined,\n      \"import specifier\",\n    );\n    node.specifiers.push(this.finishNode(specifier, \"ImportSpecifier\"));\n  }\n}\n","// @flow\n\nimport {\n  CLASS_ELEMENT_KIND_ACCESSOR,\n  CLASS_ELEMENT_FLAG_STATIC,\n  type ClassElementTypes,\n} from \"./scopeflags\";\nimport { Errors } from \"../parser/location\";\n\nexport class ClassScope {\n  // A list of private named declared in the current class\n  privateNames: Set<string> = new Set();\n\n  // A list of private getters of setters without their counterpart\n  loneAccessors: Map<string, ClassElementTypes> = new Map();\n\n  // A list of private names used before being defined, mapping to\n  // their position.\n  undefinedPrivateNames: Map<string, number> = new Map();\n}\n\ntype raiseFunction = (number, string, ...any) => void;\n\nexport default class ClassScopeHandler {\n  stack: Array<ClassScope> = [];\n  raise: raiseFunction;\n  undefinedPrivateNames: Map<string, number> = new Map();\n\n  constructor(raise: raiseFunction) {\n    this.raise = raise;\n  }\n\n  current(): ClassScope {\n    return this.stack[this.stack.length - 1];\n  }\n\n  enter() {\n    this.stack.push(new ClassScope());\n  }\n\n  exit() {\n    const oldClassScope = this.stack.pop();\n\n    // Migrate the usage of not yet defined private names to the outer\n    // class scope, or raise an error if we reached the top-level scope.\n\n    const current = this.current();\n\n    // Array.from is needed because this is compiled to an array-like for loop\n    for (const [name, pos] of Array.from(oldClassScope.undefinedPrivateNames)) {\n      if (current) {\n        if (!current.undefinedPrivateNames.has(name)) {\n          current.undefinedPrivateNames.set(name, pos);\n        }\n      } else {\n        this.raise(pos, Errors.InvalidPrivateFieldResolution, name);\n      }\n    }\n  }\n\n  declarePrivateName(\n    name: string,\n    elementType: ClassElementTypes,\n    pos: number,\n  ) {\n    const classScope = this.current();\n    let redefined = classScope.privateNames.has(name);\n\n    if (elementType & CLASS_ELEMENT_KIND_ACCESSOR) {\n      const accessor = redefined && classScope.loneAccessors.get(name);\n      if (accessor) {\n        const oldStatic = accessor & CLASS_ELEMENT_FLAG_STATIC;\n        const newStatic = elementType & CLASS_ELEMENT_FLAG_STATIC;\n\n        const oldKind = accessor & CLASS_ELEMENT_KIND_ACCESSOR;\n        const newKind = elementType & CLASS_ELEMENT_KIND_ACCESSOR;\n\n        // The private name can be duplicated only if it is used by\n        // two accessors with different kind (get and set), and if\n        // they have the same placement (static or not).\n        redefined = oldKind === newKind || oldStatic !== newStatic;\n\n        if (!redefined) classScope.loneAccessors.delete(name);\n      } else if (!redefined) {\n        classScope.loneAccessors.set(name, elementType);\n      }\n    }\n\n    if (redefined) {\n      this.raise(pos, Errors.PrivateNameRedeclaration, name);\n    }\n\n    classScope.privateNames.add(name);\n    classScope.undefinedPrivateNames.delete(name);\n  }\n\n  usePrivateName(name: string, pos: number) {\n    let classScope;\n    for (classScope of this.stack) {\n      if (classScope.privateNames.has(name)) return;\n    }\n\n    if (classScope) {\n      classScope.undefinedPrivateNames.set(name, pos);\n    } else {\n      // top-level\n      this.raise(pos, Errors.InvalidPrivateFieldResolution, name);\n    }\n  }\n}\n","// @flow\n\nimport type { Options } from \"../options\";\nimport type { File /*::, JSXOpeningElement */ } from \"../types\";\nimport type { PluginList } from \"../plugin-utils\";\nimport { getOptions } from \"../options\";\nimport StatementParser from \"./statement\";\nimport { SCOPE_PROGRAM } from \"../util/scopeflags\";\nimport ScopeHandler from \"../util/scope\";\nimport ClassScopeHandler from \"../util/class-scope\";\nimport ProductionParameterHandler, {\n  PARAM_AWAIT,\n  PARAM,\n} from \"../util/production-parameter\";\n\nexport type PluginsMap = Map<string, { [string]: any }>;\n\nexport default class Parser extends StatementParser {\n  // Forward-declaration so typescript plugin can override jsx plugin\n  /*::\n  +jsxParseOpeningElementAfterName: (\n    node: JSXOpeningElement,\n  ) => JSXOpeningElement;\n  */\n\n  constructor(options: ?Options, input: string) {\n    options = getOptions(options);\n    super(options, input);\n\n    const ScopeHandler = this.getScopeHandler();\n\n    this.options = options;\n    this.inModule = this.options.sourceType === \"module\";\n    this.scope = new ScopeHandler(this.raise.bind(this), this.inModule);\n    this.prodParam = new ProductionParameterHandler();\n    this.classScope = new ClassScopeHandler(this.raise.bind(this));\n    this.plugins = pluginsMap(this.options.plugins);\n    this.filename = options.sourceFilename;\n  }\n\n  // This can be overwritten, for example, by the TypeScript plugin.\n  getScopeHandler(): Class<ScopeHandler<*>> {\n    return ScopeHandler;\n  }\n\n  parse(): File {\n    let paramFlags = PARAM;\n    if (this.hasPlugin(\"topLevelAwait\") && this.inModule) {\n      paramFlags |= PARAM_AWAIT;\n    }\n    this.scope.enter(SCOPE_PROGRAM);\n    this.prodParam.enter(paramFlags);\n    const file = this.startNode();\n    const program = this.startNode();\n    this.nextToken();\n    file.errors = null;\n    this.parseTopLevel(file, program);\n    file.errors = this.state.errors;\n    return file;\n  }\n}\n\nfunction pluginsMap(plugins: PluginList): PluginsMap {\n  const pluginMap: PluginsMap = new Map();\n  for (const plugin of plugins) {\n    const [name, options] = Array.isArray(plugin) ? plugin : [plugin, {}];\n    if (!pluginMap.has(name)) pluginMap.set(name, options || {});\n  }\n  return pluginMap;\n}\n","// @flow\n\nimport { type Options } from \"./options\";\nimport {\n  hasPlugin,\n  validatePlugins,\n  mixinPluginNames,\n  mixinPlugins,\n  type PluginList,\n} from \"./plugin-utils\";\nimport Parser from \"./parser\";\n\nimport { types as tokTypes } from \"./tokenizer/types\";\nimport \"./tokenizer/context\";\n\nimport type { Expression, File } from \"./types\";\n\nexport function parse(input: string, options?: Options): File {\n  if (options && options.sourceType === \"unambiguous\") {\n    options = {\n      ...options,\n    };\n    try {\n      options.sourceType = \"module\";\n      const parser = getParser(options, input);\n      const ast = parser.parse();\n\n      if (parser.sawUnambiguousESM) {\n        return ast;\n      }\n\n      if (parser.ambiguousScriptDifferentAst) {\n        // Top level await introduces code which can be both a valid script and\n        // a valid module, but which produces different ASTs:\n        //    await\n        //    0\n        // can be parsed either as an AwaitExpression, or as two ExpressionStatements.\n        try {\n          options.sourceType = \"script\";\n          return getParser(options, input).parse();\n        } catch {}\n      } else {\n        // This is both a valid module and a valid script, but\n        // we parse it as a script by default\n        ast.program.sourceType = \"script\";\n      }\n\n      return ast;\n    } catch (moduleError) {\n      try {\n        options.sourceType = \"script\";\n        return getParser(options, input).parse();\n      } catch {}\n\n      throw moduleError;\n    }\n  } else {\n    return getParser(options, input).parse();\n  }\n}\n\nexport function parseExpression(input: string, options?: Options): Expression {\n  const parser = getParser(options, input);\n  if (parser.options.strictMode) {\n    parser.state.strict = true;\n  }\n  return parser.getExpression();\n}\n\nexport { tokTypes };\n\nfunction getParser(options: ?Options, input: string): Parser {\n  let cls = Parser;\n  if (options && options.plugins) {\n    validatePlugins(options.plugins);\n    cls = getParserClass(options.plugins);\n  }\n\n  return new cls(options, input);\n}\n\nconst parserClassCache: { [key: string]: Class<Parser> } = {};\n\n/** Get a Parser class with plugins applied. */\nfunction getParserClass(pluginsFromOptions: PluginList): Class<Parser> {\n  const pluginList = mixinPluginNames.filter(name =>\n    hasPlugin(pluginsFromOptions, name),\n  );\n\n  const key = pluginList.join(\"/\");\n  let cls = parserClassCache[key];\n  if (!cls) {\n    cls = Parser;\n    for (const plugin of pluginList) {\n      cls = mixinPlugins[plugin](cls);\n    }\n    parserClassCache[key] = cls;\n  }\n  return 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