109 lines
3.5 KiB
JavaScript
109 lines
3.5 KiB
JavaScript
const path = require('path')
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const fs = require('fs')
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const ts = require('typescript')
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const JSON5 = require('json5')
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const Builder = require('./Builder.cjs')
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const rootDir = path.join(__dirname, '../../../../')
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const mochaTsRelativeDir = '.mocha-ts'
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const mochaTsDir = path.join(rootDir, mochaTsRelativeDir)
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const formatHost = {
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getCanonicalFileName: path => path,
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getCurrentDirectory: ts.sys.getCurrentDirectory,
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getNewLine: () => ts.sys.newLine
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}
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module.exports = class TestsBuilder extends Builder {
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constructor ({ name = 'tsc', configPath = path.join(rootDir, 'tsconfig.json'), tempDir = mochaTsDir }) {
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super(path.join(tempDir, 'semaphore'), name)
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if (fs.existsSync(configPath) !== true) throw new Error(`Couldn't find a tsconfig file at ${configPath}`)
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this.tempDir = tempDir
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const tsConfig = JSON5.parse(fs.readFileSync(configPath, 'utf8'))
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tsConfig.file = undefined
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// Exclude already transpiled files in src
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tsConfig.exclude = ['src/ts/**/!(*.spec).ts']
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// "noResolve": true
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tsConfig.compilerOptions.noResolve = false
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// we don't need declaration files
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tsConfig.compilerOptions.declaration = false
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// we need to emit files
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tsConfig.compilerOptions.noEmit = false
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// source mapping eases debuging
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tsConfig.compilerOptions.sourceMap = true
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// This prevents SyntaxError: Cannot use import statement outside a module
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// tsConfig.compilerOptions.module = 'commonjs'
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// Removed typeroots (it causes issues)
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tsConfig.compilerOptions.typeRoots = undefined
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tsConfig.compilerOptions.outDir = path.isAbsolute(tempDir) ? path.relative(rootDir, tempDir) : tempDir
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this.tempTsConfigPath = path.join(rootDir, '.tsconfig.json')
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fs.writeFileSync(this.tempTsConfigPath, JSON.stringify(tsConfig, undefined, 2))
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const createProgram = ts.createSemanticDiagnosticsBuilderProgram
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const reportDiagnostic = (diagnostic) => {
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const filePath = path.relative(rootDir, diagnostic.file.fileName)
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const tranpiledJsPath = `${path.join(tempDir, filePath).slice(0, -3)}.js`
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const errorLine = diagnostic.file.text.slice(0, diagnostic.start).split(/\r\n|\r|\n/).length
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if (fs.existsSync(tranpiledJsPath)) {
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fs.writeFileSync(tranpiledJsPath, '', 'utf8')
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}
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this.emit('error', `[Error ${diagnostic.code}]`, `${filePath}:${errorLine}`, ':', ts.flattenDiagnosticMessageText(diagnostic.messageText, formatHost.getNewLine()))
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}
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const reportWatchStatusChanged = (diagnostic, newLine, options, errorCount) => {
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if (errorCount !== undefined) {
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this.emit('ready')
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} else {
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this.emit('busy')
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if (diagnostic.code === 6031) {
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this.emit('message', 'transpiling your tests...')
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} else if (diagnostic.code === 6032) {
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this.emit('message', 'file changes detected. Transpiling your tests...')
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}
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}
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}
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// Note that there is another overload for `createWatchCompilerHost` that takes
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// a set of root files.
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this.host = ts.createWatchCompilerHost(
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this.tempTsConfigPath,
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{},
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ts.sys,
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createProgram,
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reportDiagnostic,
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reportWatchStatusChanged
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)
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}
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async start () {
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await super.start()
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// `createWatchProgram` creates an initial program, watches files, and updates
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// the program over time.
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this.watcher = ts.createWatchProgram(this.host)
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return await this.ready()
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}
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async close () {
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await super.close()
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this.watcher.close()
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fs.unlinkSync(this.tempTsConfigPath)
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}
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}
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