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How to use underlyingSource method in wpt

Best JavaScript code snippet using wpt

streams.js

Source:streams.js

1/**2 * Copyright (c) 2013-present, Facebook, Inc.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 */7type TextEncodeOptions = {options?: boolean};8declare class TextEncoder {9  encode(buffer: string, options?: TextEncodeOptions): Uint8Array,10}11declare class ReadableStreamController {12  constructor(13    stream: ReadableStream,14    underlyingSource: UnderlyingSource,15    size: number,16    highWaterMark: number,17  ): void,18  desiredSize: number,19  close(): void,20  enqueue(chunk: any): void,21  error(error: Error): void,22}23declare class ReadableStreamBYOBRequest {24  constructor(controller: ReadableStreamController, view: $TypedArray): void,25  view: $TypedArray,26  respond(bytesWritten: number): ?any,27  respondWithNewView(view: $TypedArray): ?any,28}29declare class ReadableByteStreamController extends ReadableStreamController {30  constructor(31    stream: ReadableStream,32    underlyingSource: UnderlyingSource,33    highWaterMark: number,34  ): void,35  byobRequest: ReadableStreamBYOBRequest,36}37declare class ReadableStreamReader {38  constructor(stream: ReadableStream): void,39  closed: boolean,40  cancel(reason: string): void,41  read(): Promise<{value: ?any, done: boolean}>,42  releaseLock(): void,43}44declare interface UnderlyingSource {45  autoAllocateChunkSize?: number,46  type?: string,47  start?: (controller: ReadableStreamController) => ?Promise<void>,48  pull?: (controller: ReadableStreamController) => ?Promise<void>,49  cancel?: (reason: string) => ?Promise<void>,50}51declare class TransformStream {52  readable: ReadableStream,53  writable: WritableStream,54};55type PipeToOptions = {56  preventClose?: boolean,57  preventAbort?: boolean,58  preventCancel?: boolean,59};60type QueuingStrategy  = {61  highWaterMark: number,62  size(chunk: ?any): number,63};64declare class ReadableStream {65  constructor(66    underlyingSource: ?UnderlyingSource,67    queuingStrategy: ?QueuingStrategy,68  ): void,69  locked: boolean,70  cancel(reason: string): void,71  getReader(): ReadableStreamReader,72  pipeThrough(transform: TransformStream, options: ?any): void,73  pipeTo(dest: WritableStream, options: ?PipeToOptions): void,74  tee(): [ReadableStream, ReadableStream],75};76declare interface WritableStreamController {77  error(error: Error): void,78}79declare interface UnderlyingSink {80  autoAllocateChunkSize?: number,81  type?: string,82  abort?: (reason: string) => ?Promise<void>,83  close?: (controller: WritableStreamController) => ?Promise<void>,84  start?: (controller: WritableStreamController) => ?Promise<void>,85  write?: (chunk: any, controller: WritableStreamController) => ?Promise<void>,86}87declare interface WritableStreamWriter {88  closed: Promise<any>,89  desiredSize?: number,90  ready: Promise<any>,91  abort(reason: string): ?Promise<any>,92  close(): Promise<any>,93  releaseLock(): void,94  write(chunk: any): Promise<any>,95}96declare class WritableStream {97  constructor(98    underlyingSink: ?UnderlyingSink,99    queuingStrategy: QueuingStrategy,100  ): void,101  locked: boolean,102  abort(reason: string): void,103  getWriter(): WritableStreamWriter,...

readable.js

Source:readable.js

1import * as Reader from "./reader.js"2import * as Stream from "./stream.js"3import { CancelError, LockError } from "./error.js"4import * as Controller from "./controller.js"5import * as Source from "./source.js"6import * as Strategy from "./strategy.js"7/**8 * @template T9 * @typedef {import('../types/readable').StreamState<T>} State10 */11export const isLocked = Stream.isLocked12/**13 * @template T14 * @param {UnderlyingSource<T>|UnderlyingByteSource} underlyingSource15 * @param {QueuingStrategy<T>} queuingStrategy16 * @returns {State<T>}17 */18export const init = (underlyingSource, queuingStrategy) => {19  if (underlyingSource.type === undefined) {20    const strategy = Strategy.from(queuingStrategy)21    const source = Source.from(underlyingSource)22    const state = Stream.create(source, strategy)23    Controller.start(state)24    return state25  } else if (String(underlyingSource.type) === "bytes") {26    throw new TypeError(27      `support for 'new ReadableStream({ type: "bytes" })' is not yet implemented`28    )29  } else {30    throw new TypeError(`'underlyingSource.type' must be "bytes" or undefined.`)31  }32}33/**34 * @template T35 * @param {State<T>} stream36 * @param {Error|undefined} reason37 * @returns {Promise<void>}38 */39export const cancel = (stream, reason) => {40  if (isLocked(stream)) {41    throw new CancelError(42      `The ReadableStream reader method 'cancel' may only be called on a reader owned by a stream.`43    )44  } else {45    return Stream.cancel(stream, reason)46  }47}48/**49 * @template T50 * @param {State<T>} stream51 * @param {{mode:"byob"}} [options]52 * @returns {ReadableStreamDefaultReader<T>}53 */54export const getReader = (stream, options) => {55  if (isLocked(stream)) {56    throw new LockError(57      "A Reader may only be created for an unlocked ReadableStream"58    )59  } else if (!options || options.mode === undefined) {60    const state = Reader.init(stream)61    stream.reader = state62    return new Reader.Reader(state)63  } else if (options.mode === "byob") {64    throw new TypeError("byob readers ar not supported")65  } else {66    throw new TypeError(67      `Invalid mode "${options.mode}" passed to a getReader method of ReadableStream`68    )69  }70}71/**72 * @template T73 * @param {State<T>} state74 * @returns {[ReadableStream<T>, ReadableStream<T>]}75 */76export const tee = (state) => {77  void state78  throw new Error("Not implemented")...

source.js

Source:source.js

1/**2 * @template T3 * @param {UnderlyingSource<T>} underlyingSource4 * @returns {import('../types/readable').Source<T>}5 */6export const from = (underlyingSource) => {7  return {8    start: bindMethod(underlyingSource, "start") || noop,9    pull: bindMethod(underlyingSource, "pull") || noop,10    cancel: bindMethod(underlyingSource, "cancel") || noop,11  }12}13const noop = () => {}14/**15 * @template T16 * @template {'start'|'cancel'|'pull'} Name17 * @param {UnderlyingSource<T>} source18 * @param {Name} name19 * @returns {UnderlyingSource<T>[Name]}20 */21const bindMethod = (source, name) => {22  const method = source[name]23  switch (typeof method) {24    case "undefined":25      return undefined26    case "function":27      return method.bind(source)28    default:29      throw new TypeError(30        `ReadbleStream source.{name} method is not a function`31      )32  }...

Using AI Code Generation

1var rs = new ReadableStream({2  start(controller) {3    console.log('start');4  },5  pull(controller) {6    console.log('pull');7  },8  cancel(reason) {9    console.log('cancel', reason);10  }11});12var ws = new WritableStream({13  start(controller) {14    console.log('start');15  },16  write(chunk, controller) {17    console.log('write', chunk);18  },19  close(controller) {20    console.log('close');21  },22  abort(reason) {23    console.log('abort', reason);24  }25});26var ts = new TransformStream({27  start(controller) {28    console.log('start');29  },30  transform(chunk, controller) {31    console.log('transform', chunk);32    controller.enqueue(chunk);33  },34  flush(controller) {35    console.log('flush');36    controller.enqueue(null);37  },38  close(controller) {39    console.log('close');40  },41  abort(reason) {42    console.log('abort', reason);43  }44});45var readableStream = new ReadableStream({46  start(controller) {47    console.log('start');48  },49  pull(controller) {50    console.log('pull');51  },52  cancel(reason) {53    console.log('cancel', reason);54  }55});56var transformStream = new TransformStream({57  start(controller) {58    console.log('start

Using AI Code Generation

1var rs = new ReadableStream({2  start: function(controller) {3    console.log('start');4  },5  pull: function(controller) {6    console.log('pull');7  },8  cancel: function(reason) {9    console.log('cancel', reason);10  }11});12rs.getReader().read().then(function(result) {13  console.log(result);14});15rs.getReader().read().then(function(result) {16  console.log(result);17});18rs.getReader().read().then(function(result) {19  console.log(result);20});21rs.cancel("I don't like the first chunk");

Using AI Code Generation

1var stream = new ReadableStream({2  start(controller) {3    console.log('start');4    controller.enqueue('a');5    controller.enqueue('b');6    controller.enqueue('c');7    controller.close();8  },9  pull(controller) {10    console.log('pull');11  },12  cancel(reason) {13    console.log('cancel', reason);14  }15});16stream.getReader().read().then(result => {17  console.log(result);18});19stream.getReader().read().then(result => {20  console.log(result);21});22stream.getReader().read().then(result => {23  console.log(result);24});25stream.getReader().read().then(result => {26  console.log(result);27});28var stream = new ReadableStream({29  start(controller) {30    console.log('start');31    controller.enqueue('a');32    controller.enqueue('b');33    controller.enqueue('c');34    controller.close();35  },36  pull(controller) {37    console.log('pull');38  },39  cancel(reason) {40    console.log('cancel', reason);41  }42});43stream.getReader().read().then(result => {44  console.log(result);45});46stream.getReader().read().then(result => {47  console.log(result);48});49stream.getReader().read().then(result => {50  console.log(result);51});52stream.getReader().read().then(result => {53  console.log(result);54});55var stream = new ReadableStream({56  start(controller) {57    console.log('start');58    controller.enqueue('

Using AI Code Generation

1function testUnderlyingSource() {2  const underlyingSource = {3    start(controller) {4      controller.enqueue('a');5      controller.enqueue('b');6      controller.enqueue('c');7      controller.close();8    },9    pull(controller) {10      console.log('pull() called');11    },12    cancel(reason) {13      console.log(reason);14    }15  };16  const readableStream = new ReadableStream(underlyingSource);17  const reader = readableStream.getReader();18  return reader.read().then(result1 => {19    console.log(result1.value);20    return reader.read().then(result2 => {21      console.log(result2.value);22      return reader.read().then(result3 => {23        console.log(result3.value);24        return reader.read().then(result4 => {25          console.log(result4.value);26          reader.releaseLock();27        });28      });29    });30  });31}32testUnderlyingSource();33function testUnderlyingSink() {34  const underlyingSink = {35    start(controller) {36      this.chunks = [];37    },38    write(chunk, controller) {39      this.chunks.push(chunk);40    },41    close(controller) {42      console.log(this.chunks.join(''));43    },44    abort(reason) {45      console.log(reason);46    }47  };48  const writableStream = new WritableStream(underlyingSink);49  const writer = writableStream.getWriter();50  const start = Date.now();51  return writer.write('a')52    .then(() => writer.write('b'))53    .then(() => writer.write('c'))54    .then(() => writer.close());55}56testUnderlyingSink();57function testUnderlyingSourceAndSink() {58  const underlyingSource = {59    start(controller) {60      this.isCancelled = false;61      this.interval = setInterval(() => {62        if (this.isCancelled) {63          return;64        }65        controller.enqueue('a');66      }, 1000);67    },68    pull(controller) {69      console.log('pull() called');70    },71    cancel(reason) {72      console.log(reason);73      this.isCancelled = true;74      clearInterval(this.interval);75    }76  };77  const readableStream = new ReadableStream(underlyingSource);78  const reader = readableStream.getReader();79  const start = Date.now();

Using AI Code Generation

1function createReadableStream() {2    var rs = new ReadableStream({3        start(controller) {4            controller.enqueue('a');5            controller.enqueue('b');6            controller.enqueue('c');7            controller.close();8        }9    });10    return rs;11}12function createTransformStream() {13    var ts = new TransformStream({14        transform(chunk, controller) {15            controller.enqueue(chunk.toUpperCase());16        }17    });18    return ts;19}20function createWritableStream() {21    var ws = new WritableStream({22        write(chunk) {23            console.log(chunk);24        }25    });26    return ws;27}28function createReadableTransformWritableStream() {29    var ts = new TransformStream({30        transform(chunk, controller) {31            controller.enqueue(chunk.toUpperCase());32        }33    });34    var rs = new ReadableStream({35        start(controller) {36            controller.enqueue('a');37            controller.enqueue('b');38            controller.enqueue('c');39            controller.close();40        }41    });42    var ws = new WritableStream({43        write(chunk) {44            console.log(chunk);45        }46    });47    return [rs, ts, ws];48}49function pipeThrough(rs, ts) {50    return rs.pipeThrough(ts);51}52function pipeTo(rs, ws) {53    return rs.pipeTo(ws);54}55function pipe(rs, ts, ws) {56    return rs.pipeThrough(ts).pipeTo(ws);57}58var rs, ts, ws;59var rs2, ts2, ws2;60var rs3, ts3, ws3;61function pipeThroughTest() {62    rs = createReadableStream();63    ts = createTransformStream();64    rs.pipeThrough(ts

Using AI Code Generation

1var rs = new ReadableStream({2  start(controller) {3    console.log('starting');4  },5  pull(controller) {6    console.log('pulling');7  },8  cancel(reason) {9    console.log('cancelling');10  }11});12var reader = rs.getReader();13reader.read().then(({value, done}) => {14  if (done) {15    console.log('Stream complete');16  } else {17    console.log('Read chunk: ', value);18  }19});20reader.releaseLock();21var rs = new ReadableStream({22  start(controller) {23    console.log('starting');24  },25  pull(controller) {26    console.log('pulling');27  },28  cancel(reason) {29    console.log('cancelling');30  }31});32var reader = rs.getReader();33reader.read().then(({value, done}) => {34  if (done) {35    console.log('Stream complete');36  } else {37    console.log('Read chunk: ', value);38  }39});40reader.releaseLock();41var rs = new ReadableStream({42  start(controller) {43    console.log('starting');44  },45  pull(controller) {46    console.log('pulling');47  },48  cancel(reason) {49    console.log('cancelling');50  }51});52var reader = rs.getReader();53reader.read().then(({value, done}) => {

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