kernel-dns/polyfill.js

export var Buffer = require("buffer-browserify").Buffer;
var bufferFill = require("buffer-fill");

export const process = {
  cwd: () => "",
  env: {},
};

function allocUnsafe(size) {
  if (typeof size !== "number") {
    throw new TypeError('"size" argument must be a number');
  }

  if (size < 0) {
    throw new RangeError('"size" argument must not be negative');
  }

  return new Uint32Array(size);
}

var toString = Object.prototype.toString;

function isArrayBuffer(input) {
  return toString.call(input).slice(8, -1) === "ArrayBuffer";
}

function fromArrayBuffer(obj, byteOffset, length) {
  byteOffset >>>= 0;

  var maxLength = obj.byteLength - byteOffset;

  if (maxLength < 0) {
    throw new RangeError("'offset' is out of bounds");
  }

  if (length === undefined) {
    length = maxLength;
  } else {
    length >>>= 0;

    if (length > maxLength) {
      throw new RangeError("'length' is out of bounds");
    }
  }

  return new Buffer(new Uint8Array(obj.slice(byteOffset, byteOffset + length)));
}

function fromString(string, encoding) {
  if (typeof encoding !== "string" || encoding === "") {
    encoding = "utf8";
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('"encoding" must be a valid string encoding');
  }

  return new Buffer(string, encoding);
}

function bufferFrom(value, encodingOrOffset, length) {
  if (typeof value === "number") {
    throw new TypeError('"value" argument must not be a number');
  }

  if (isArrayBuffer(value)) {
    return fromArrayBuffer(value, encodingOrOffset, length);
  }

  if (typeof value === "string") {
    return fromString(value, encodingOrOffset);
  }

  return new Buffer(value);
}

Buffer.alloc = function alloc(size, fill, encoding) {
  if (typeof size !== "number") {
    throw new TypeError('"size" argument must be a number');
  }

  if (size < 0) {
    throw new RangeError('"size" argument must not be negative');
  }

  var buffer = allocUnsafe(size);

  if (size === 0) {
    return buffer;
  }

  if (fill === undefined) {
    return bufferFill(buffer, 0);
  }

  if (typeof encoding !== "string") {
    encoding = undefined;
  }

  return bufferFill(buffer, fill, encoding);
};
Buffer.allocUnsafe = allocUnsafe;
Buffer.from = bufferFrom;
Object.defineProperty(Buffer.prototype, "buffer", {
  get: function myProperty() {
    return this;
  },
});
Object.defineProperty(Buffer.prototype, "byteOffset", {
  get: function myProperty() {
    return this.offset;
  },
});
Object.defineProperty(Buffer.prototype, "byteLength", {
  get: function myProperty() {
    return this.length;
  },
});