diff --git a/generate-wasm-examples/generate_wasm_examples.sh b/generate-wasm-examples/generate_wasm_examples.sh index e4d9a8328d..cdd72f27ef 100755 --- a/generate-wasm-examples/generate_wasm_examples.sh +++ b/generate-wasm-examples/generate_wasm_examples.sh @@ -35,6 +35,15 @@ add_category() cp examples/$category_path/$example.rs ../../content/examples/$category_path/$example/ cargo build --release --target wasm32-unknown-unknown --example $example wasm-bindgen --out-dir ../../content/examples/$category_path/$example --no-typescript --target web target/wasm32-unknown-unknown/release/examples/$example.wasm + + # Patch generated JS to allow to inject custom `fetch` with loading feedback. + # See: https://github.com/bevyengine/bevy-website/pull/355 + sed -i.bak \ + -e 's/function init(input) {/function init(customFetch, input) { customFetch = customFetch || fetch;/' \ + -e 's/input = fetch(/input = customFetch(/' \ + -e 's/getObject(arg0).fetch(/customFetch(/' \ + ../../content/examples/$category_path/$example/$example.js + echo "+++ title = \"$example\" template = \"example.html\" diff --git a/sass/components/_bevy-instance.scss b/sass/components/_bevy-instance.scss new file mode 100644 index 0000000000..32d9aa90dc --- /dev/null +++ b/sass/components/_bevy-instance.scss @@ -0,0 +1,51 @@ +.bevy-instance { + position: relative; + + &__progress-status { + display: flex; + flex-direction: column; + position: absolute; + bottom: 50%; + left: 50%; + width: 250px; + transform: translateX(-50%); + + &:empty { + display: none; + } + } + + &__progress-file { + margin-bottom: 4px; + font-weight: normal; + text-shadow: 1px 1px 1px #000; + font-size: 0.85rem; + word-break: break-all; + } + + &__progress-track { + width: 100%; + height: 4px; + border-radius: 4px; + background-color: #555; + + &:not(:last-child) { + margin-bottom: 2px; + } + } + + &__progress-bar { + height: 4px; + min-width: 4px; + background-color: #799bbb; + border-radius: 4px; + width: 0px; + } + + &__canvas { + width: 100% !important; + height: auto !important; + border-radius: $border-radius; + background: #2b2c2f; + } +} diff --git a/sass/components/_example.scss b/sass/components/_example.scss index 6d723d5092..76c107c1c2 100644 --- a/sass/components/_example.scss +++ b/sass/components/_example.scss @@ -47,10 +47,4 @@ grid-area: github; text-align: right; } - - &__canvas { - width: 100% !important; - height: auto !important; - border-radius: $border-radius; - } } diff --git a/sass/site.scss b/sass/site.scss index 1bec6cec66..b5f434b79e 100644 --- a/sass/site.scss +++ b/sass/site.scss @@ -19,6 +19,7 @@ // - Repeating visual patterns: buttons, cards, menus… // - Components can be composed between them to create new components // - These should be self contained and shouldn't affect other styling +@import "components/bevy-instance"; @import "components/book-footer"; @import "components/book-nav"; @import "components/card"; diff --git a/static/tools.js b/static/tools.js new file mode 100644 index 0000000000..96357a196c --- /dev/null +++ b/static/tools.js @@ -0,0 +1,53 @@ +import { ReadableStream as PolyfillReadableStream, TransformStream as PolyfillTransformStream } from '/web-streams-polyfill-3.2.1.mjs'; +import { createReadableStreamWrapper } from '/web-streams-adapter-0.1.0.mjs'; + +function getFilename(resource) { + const pathname = (typeof resource === 'string') + ? resource + : (resource instanceof URL) + ? resource.pathname + : ''; + + const parts = pathname.split('/'); + + return parts[parts.length - 1]; +} + +// `progressiveFetch` is a wrapper over `window.fetch`. It allows you to insert middle-ware that is +// polled as the fetch completes. See bevy-website/issues/338 for details. +async function progressiveFetch(resource, callbacks={}) { + const toPolyfillReadable = createReadableStreamWrapper(PolyfillReadableStream); + const toNativeReadable = createReadableStreamWrapper(window.ReadableStream); + const filename = getFilename(resource); + const cb = Object.assign({ + start: (filename, length) => {}, + update: (filename, loaded, length) => {}, + finish: (filename, length) => {}, + }, callbacks); + + let response = await fetch(resource); + const lengthBytes = response.headers.get('content-length'); + let loadedBytes = 0; + + const transform = new PolyfillTransformStream({ + start() { + cb.start(filename, lengthBytes); + }, + transform(chunk, controller) { + loadedBytes += chunk.byteLength; + cb.update(filename, loadedBytes, lengthBytes); + controller.enqueue(chunk); + }, + flush() { + cb.update(filename, lengthBytes, lengthBytes); + cb.finish(filename, lengthBytes); + }, + }); + + return new Response( + toNativeReadable(toPolyfillReadable(response.body).pipeThrough(transform)), + response, + ); +} + +export { progressiveFetch }; diff --git a/static/web-streams-adapter-0.1.0.mjs b/static/web-streams-adapter-0.1.0.mjs new file mode 100644 index 0000000000..3619f4c54e --- /dev/null +++ b/static/web-streams-adapter-0.1.0.mjs @@ -0,0 +1,559 @@ +// Copied from: https://unpkg.com/@mattiasbuelens/web-streams-adapter@0.1.0/dist/web-streams-adapter.mjs +/*! ***************************************************************************** +Copyright (c) Microsoft Corporation. + +Permission to use, copy, modify, and/or distribute this software for any +purpose with or without fee is hereby granted. + +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH +REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY +AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, +INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM +LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR +OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR +PERFORMANCE OF THIS SOFTWARE. +***************************************************************************** */ +/* global Reflect, Promise */ +var extendStatics = function(d, b) { + extendStatics = Object.setPrototypeOf || + ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) || + function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; }; + return extendStatics(d, b); +}; + +function __extends(d, b) { + if (typeof b !== "function" && b !== null) + throw new TypeError("Class extends value " + String(b) + " is not a constructor or null"); + extendStatics(d, b); + function __() { this.constructor = d; } + d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); +} + +function assert(test) { + if (!test) { + throw new TypeError('Assertion failed'); + } +} + +function noop() { + return; +} +function typeIsObject(x) { + return (typeof x === 'object' && x !== null) || typeof x === 'function'; +} + +function isStreamConstructor(ctor) { + if (typeof ctor !== 'function') { + return false; + } + var startCalled = false; + try { + new ctor({ + start: function () { + startCalled = true; + } + }); + } + catch (e) { + // ignore + } + return startCalled; +} +function isReadableStream(readable) { + if (!typeIsObject(readable)) { + return false; + } + if (typeof readable.getReader !== 'function') { + return false; + } + return true; +} +function isReadableStreamConstructor(ctor) { + if (!isStreamConstructor(ctor)) { + return false; + } + if (!isReadableStream(new ctor())) { + return false; + } + return true; +} +function isWritableStream(writable) { + if (!typeIsObject(writable)) { + return false; + } + if (typeof writable.getWriter !== 'function') { + return false; + } + return true; +} +function isWritableStreamConstructor(ctor) { + if (!isStreamConstructor(ctor)) { + return false; + } + if (!isWritableStream(new ctor())) { + return false; + } + return true; +} +function isTransformStream(transform) { + if (!typeIsObject(transform)) { + return false; + } + if (!isReadableStream(transform.readable)) { + return false; + } + if (!isWritableStream(transform.writable)) { + return false; + } + return true; +} +function isTransformStreamConstructor(ctor) { + if (!isStreamConstructor(ctor)) { + return false; + } + if (!isTransformStream(new ctor())) { + return false; + } + return true; +} +function supportsByobReader(readable) { + try { + var reader = readable.getReader({ mode: 'byob' }); + reader.releaseLock(); + return true; + } + catch (_a) { + return false; + } +} +function supportsByteSource(ctor) { + try { + new ctor({ type: 'bytes' }); + return true; + } + catch (_a) { + return false; + } +} + +function createReadableStreamWrapper(ctor) { + assert(isReadableStreamConstructor(ctor)); + var byteSourceSupported = supportsByteSource(ctor); + return function (readable, _a) { + var _b = _a === void 0 ? {} : _a, type = _b.type; + type = parseReadableType(type); + if (type === 'bytes' && !byteSourceSupported) { + type = undefined; + } + if (readable.constructor === ctor) { + if (type !== 'bytes' || supportsByobReader(readable)) { + return readable; + } + } + if (type === 'bytes') { + var source = createWrappingReadableSource(readable, { type: type }); + return new ctor(source); + } + else { + var source = createWrappingReadableSource(readable); + return new ctor(source); + } + }; +} +function createWrappingReadableSource(readable, _a) { + var _b = _a === void 0 ? {} : _a, type = _b.type; + assert(isReadableStream(readable)); + assert(readable.locked === false); + type = parseReadableType(type); + var source; + if (type === 'bytes') { + source = new WrappingReadableByteStreamSource(readable); + } + else { + source = new WrappingReadableStreamDefaultSource(readable); + } + return source; +} +function parseReadableType(type) { + var typeString = String(type); + if (typeString === 'bytes') { + return typeString; + } + else if (type === undefined) { + return type; + } + else { + throw new RangeError('Invalid type is specified'); + } +} +var AbstractWrappingReadableStreamSource = /** @class */ (function () { + function AbstractWrappingReadableStreamSource(underlyingStream) { + this._underlyingReader = undefined; + this._readerMode = undefined; + this._readableStreamController = undefined; + this._pendingRead = undefined; + this._underlyingStream = underlyingStream; + // always keep a reader attached to detect close/error + this._attachDefaultReader(); + } + AbstractWrappingReadableStreamSource.prototype.start = function (controller) { + this._readableStreamController = controller; + }; + AbstractWrappingReadableStreamSource.prototype.cancel = function (reason) { + assert(this._underlyingReader !== undefined); + return this._underlyingReader.cancel(reason); + }; + AbstractWrappingReadableStreamSource.prototype._attachDefaultReader = function () { + if (this._readerMode === "default" /* DEFAULT */) { + return; + } + this._detachReader(); + var reader = this._underlyingStream.getReader(); + this._readerMode = "default" /* DEFAULT */; + this._attachReader(reader); + }; + AbstractWrappingReadableStreamSource.prototype._attachReader = function (reader) { + var _this = this; + assert(this._underlyingReader === undefined); + this._underlyingReader = reader; + var closed = this._underlyingReader.closed; + if (!closed) { + return; + } + closed + .then(function () { return _this._finishPendingRead(); }) + .then(function () { + if (reader === _this._underlyingReader) { + _this._readableStreamController.close(); + } + }, function (reason) { + if (reader === _this._underlyingReader) { + _this._readableStreamController.error(reason); + } + }) + .catch(noop); + }; + AbstractWrappingReadableStreamSource.prototype._detachReader = function () { + if (this._underlyingReader === undefined) { + return; + } + this._underlyingReader.releaseLock(); + this._underlyingReader = undefined; + this._readerMode = undefined; + }; + AbstractWrappingReadableStreamSource.prototype._pullWithDefaultReader = function () { + var _this = this; + this._attachDefaultReader(); + // TODO Backpressure? + var read = this._underlyingReader.read() + .then(function (result) { + var controller = _this._readableStreamController; + if (result.done) { + _this._tryClose(); + } + else { + controller.enqueue(result.value); + } + }); + this._setPendingRead(read); + return read; + }; + AbstractWrappingReadableStreamSource.prototype._tryClose = function () { + try { + this._readableStreamController.close(); + } + catch (_a) { + // already errored or closed + } + }; + AbstractWrappingReadableStreamSource.prototype._setPendingRead = function (readPromise) { + var _this = this; + var pendingRead; + var finishRead = function () { + if (_this._pendingRead === pendingRead) { + _this._pendingRead = undefined; + } + }; + this._pendingRead = pendingRead = readPromise.then(finishRead, finishRead); + }; + AbstractWrappingReadableStreamSource.prototype._finishPendingRead = function () { + var _this = this; + if (!this._pendingRead) { + return undefined; + } + var afterRead = function () { return _this._finishPendingRead(); }; + return this._pendingRead.then(afterRead, afterRead); + }; + return AbstractWrappingReadableStreamSource; +}()); +var WrappingReadableStreamDefaultSource = /** @class */ (function (_super) { + __extends(WrappingReadableStreamDefaultSource, _super); + function WrappingReadableStreamDefaultSource() { + return _super !== null && _super.apply(this, arguments) || this; + } + WrappingReadableStreamDefaultSource.prototype.pull = function () { + return this._pullWithDefaultReader(); + }; + return WrappingReadableStreamDefaultSource; +}(AbstractWrappingReadableStreamSource)); +function toUint8Array(view) { + return new Uint8Array(view.buffer, view.byteOffset, view.byteLength); +} +function copyArrayBufferView(from, to) { + var fromArray = toUint8Array(from); + var toArray = toUint8Array(to); + toArray.set(fromArray, 0); +} +var WrappingReadableByteStreamSource = /** @class */ (function (_super) { + __extends(WrappingReadableByteStreamSource, _super); + function WrappingReadableByteStreamSource(underlyingStream) { + var _this = this; + var supportsByob = supportsByobReader(underlyingStream); + _this = _super.call(this, underlyingStream) || this; + _this._supportsByob = supportsByob; + return _this; + } + Object.defineProperty(WrappingReadableByteStreamSource.prototype, "type", { + get: function () { + return 'bytes'; + }, + enumerable: false, + configurable: true + }); + WrappingReadableByteStreamSource.prototype._attachByobReader = function () { + if (this._readerMode === "byob" /* BYOB */) { + return; + } + assert(this._supportsByob); + this._detachReader(); + var reader = this._underlyingStream.getReader({ mode: 'byob' }); + this._readerMode = "byob" /* BYOB */; + this._attachReader(reader); + }; + WrappingReadableByteStreamSource.prototype.pull = function () { + if (this._supportsByob) { + var byobRequest = this._readableStreamController.byobRequest; + if (byobRequest) { + return this._pullWithByobRequest(byobRequest); + } + } + return this._pullWithDefaultReader(); + }; + WrappingReadableByteStreamSource.prototype._pullWithByobRequest = function (byobRequest) { + var _this = this; + this._attachByobReader(); + // reader.read(view) detaches the input view, therefore we cannot pass byobRequest.view directly + // create a separate buffer to read into, then copy that to byobRequest.view + var buffer = new Uint8Array(byobRequest.view.byteLength); + // TODO Backpressure? + var read = this._underlyingReader.read(buffer) + .then(function (result) { + _this._readableStreamController; + if (result.done) { + _this._tryClose(); + byobRequest.respond(0); + } + else { + copyArrayBufferView(result.value, byobRequest.view); + byobRequest.respond(result.value.byteLength); + } + }); + this._setPendingRead(read); + return read; + }; + return WrappingReadableByteStreamSource; +}(AbstractWrappingReadableStreamSource)); + +function createWritableStreamWrapper(ctor) { + assert(isWritableStreamConstructor(ctor)); + return function (writable) { + if (writable.constructor === ctor) { + return writable; + } + var sink = createWrappingWritableSink(writable); + return new ctor(sink); + }; +} +function createWrappingWritableSink(writable) { + assert(isWritableStream(writable)); + assert(writable.locked === false); + var writer = writable.getWriter(); + return new WrappingWritableStreamSink(writer); +} +var WrappingWritableStreamSink = /** @class */ (function () { + function WrappingWritableStreamSink(underlyingWriter) { + var _this = this; + this._writableStreamController = undefined; + this._pendingWrite = undefined; + this._state = "writable" /* WRITABLE */; + this._storedError = undefined; + this._underlyingWriter = underlyingWriter; + this._errorPromise = new Promise(function (resolve, reject) { + _this._errorPromiseReject = reject; + }); + this._errorPromise.catch(noop); + } + WrappingWritableStreamSink.prototype.start = function (controller) { + var _this = this; + this._writableStreamController = controller; + this._underlyingWriter.closed + .then(function () { + _this._state = "closed" /* CLOSED */; + }) + .catch(function (reason) { return _this._finishErroring(reason); }); + }; + WrappingWritableStreamSink.prototype.write = function (chunk) { + var _this = this; + var writer = this._underlyingWriter; + // Detect past errors + if (writer.desiredSize === null) { + return writer.ready; + } + var writeRequest = writer.write(chunk); + // Detect future errors + writeRequest.catch(function (reason) { return _this._finishErroring(reason); }); + writer.ready.catch(function (reason) { return _this._startErroring(reason); }); + // Reject write when errored + var write = Promise.race([writeRequest, this._errorPromise]); + this._setPendingWrite(write); + return write; + }; + WrappingWritableStreamSink.prototype.close = function () { + var _this = this; + if (this._pendingWrite === undefined) { + return this._underlyingWriter.close(); + } + return this._finishPendingWrite().then(function () { return _this.close(); }); + }; + WrappingWritableStreamSink.prototype.abort = function (reason) { + if (this._state === "errored" /* ERRORED */) { + return undefined; + } + var writer = this._underlyingWriter; + return writer.abort(reason); + }; + WrappingWritableStreamSink.prototype._setPendingWrite = function (writePromise) { + var _this = this; + var pendingWrite; + var finishWrite = function () { + if (_this._pendingWrite === pendingWrite) { + _this._pendingWrite = undefined; + } + }; + this._pendingWrite = pendingWrite = writePromise.then(finishWrite, finishWrite); + }; + WrappingWritableStreamSink.prototype._finishPendingWrite = function () { + var _this = this; + if (this._pendingWrite === undefined) { + return Promise.resolve(); + } + var afterWrite = function () { return _this._finishPendingWrite(); }; + return this._pendingWrite.then(afterWrite, afterWrite); + }; + WrappingWritableStreamSink.prototype._startErroring = function (reason) { + var _this = this; + if (this._state === "writable" /* WRITABLE */) { + this._state = "erroring" /* ERRORING */; + this._storedError = reason; + var afterWrite = function () { return _this._finishErroring(reason); }; + if (this._pendingWrite === undefined) { + afterWrite(); + } + else { + this._finishPendingWrite().then(afterWrite, afterWrite); + } + this._writableStreamController.error(reason); + } + }; + WrappingWritableStreamSink.prototype._finishErroring = function (reason) { + if (this._state === "writable" /* WRITABLE */) { + this._startErroring(reason); + } + if (this._state === "erroring" /* ERRORING */) { + this._state = "errored" /* ERRORED */; + this._errorPromiseReject(this._storedError); + } + }; + return WrappingWritableStreamSink; +}()); + +function createTransformStreamWrapper(ctor) { + assert(isTransformStreamConstructor(ctor)); + return function (transform) { + if (transform.constructor === ctor) { + return transform; + } + var transformer = createWrappingTransformer(transform); + return new ctor(transformer); + }; +} +function createWrappingTransformer(transform) { + assert(isTransformStream(transform)); + var readable = transform.readable, writable = transform.writable; + assert(readable.locked === false); + assert(writable.locked === false); + var reader = readable.getReader(); + var writer; + try { + writer = writable.getWriter(); + } + catch (e) { + reader.releaseLock(); // do not leak reader + throw e; + } + return new WrappingTransformStreamTransformer(reader, writer); +} +var WrappingTransformStreamTransformer = /** @class */ (function () { + function WrappingTransformStreamTransformer(reader, writer) { + var _this = this; + this._transformStreamController = undefined; + this._onRead = function (result) { + if (result.done) { + return; + } + _this._transformStreamController.enqueue(result.value); + return _this._reader.read().then(_this._onRead); + }; + this._onError = function (reason) { + _this._flushReject(reason); + _this._transformStreamController.error(reason); + _this._reader.cancel(reason).catch(noop); + _this._writer.abort(reason).catch(noop); + }; + this._onTerminate = function () { + _this._flushResolve(); + _this._transformStreamController.terminate(); + var error = new TypeError('TransformStream terminated'); + _this._writer.abort(error).catch(noop); + }; + this._reader = reader; + this._writer = writer; + this._flushPromise = new Promise(function (resolve, reject) { + _this._flushResolve = resolve; + _this._flushReject = reject; + }); + } + WrappingTransformStreamTransformer.prototype.start = function (controller) { + this._transformStreamController = controller; + this._reader.read() + .then(this._onRead) + .then(this._onTerminate, this._onError); + var readerClosed = this._reader.closed; + if (readerClosed) { + readerClosed + .then(this._onTerminate, this._onError); + } + }; + WrappingTransformStreamTransformer.prototype.transform = function (chunk) { + return this._writer.write(chunk); + }; + WrappingTransformStreamTransformer.prototype.flush = function () { + var _this = this; + return this._writer.close() + .then(function () { return _this._flushPromise; }); + }; + return WrappingTransformStreamTransformer; +}()); + +export { createReadableStreamWrapper, createTransformStreamWrapper, createWrappingReadableSource, createWrappingTransformer, createWrappingWritableSink, createWritableStreamWrapper }; +//# sourceMappingURL=web-streams-adapter.mjs.map diff --git a/static/web-streams-polyfill-3.2.1.mjs b/static/web-streams-polyfill-3.2.1.mjs new file mode 100644 index 0000000000..2cd993f4a9 --- /dev/null +++ b/static/web-streams-polyfill-3.2.1.mjs @@ -0,0 +1,4203 @@ +// Copied from: https://unpkg.com/web-streams-polyfill@3.2.1/dist/ponyfill.es6.mjs +/** + * web-streams-polyfill v3.2.1 + */ +/// +const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ? + Symbol : + description => `Symbol(${description})`; + +/// +function noop() { + return undefined; +} +function getGlobals() { + if (typeof self !== 'undefined') { + return self; + } + else if (typeof window !== 'undefined') { + return window; + } + else if (typeof global !== 'undefined') { + return global; + } + return undefined; +} +const globals = getGlobals(); + +function typeIsObject(x) { + return (typeof x === 'object' && x !== null) || typeof x === 'function'; +} +const rethrowAssertionErrorRejection = noop; + +const originalPromise = Promise; +const originalPromiseThen = Promise.prototype.then; +const originalPromiseResolve = Promise.resolve.bind(originalPromise); +const originalPromiseReject = Promise.reject.bind(originalPromise); +function newPromise(executor) { + return new originalPromise(executor); +} +function promiseResolvedWith(value) { + return originalPromiseResolve(value); +} +function promiseRejectedWith(reason) { + return originalPromiseReject(reason); +} +function PerformPromiseThen(promise, onFulfilled, onRejected) { + // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an + // approximation. + return originalPromiseThen.call(promise, onFulfilled, onRejected); +} +function uponPromise(promise, onFulfilled, onRejected) { + PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection); +} +function uponFulfillment(promise, onFulfilled) { + uponPromise(promise, onFulfilled); +} +function uponRejection(promise, onRejected) { + uponPromise(promise, undefined, onRejected); +} +function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) { + return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler); +} +function setPromiseIsHandledToTrue(promise) { + PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection); +} +const queueMicrotask = (() => { + const globalQueueMicrotask = globals && globals.queueMicrotask; + if (typeof globalQueueMicrotask === 'function') { + return globalQueueMicrotask; + } + const resolvedPromise = promiseResolvedWith(undefined); + return (fn) => PerformPromiseThen(resolvedPromise, fn); +})(); +function reflectCall(F, V, args) { + if (typeof F !== 'function') { + throw new TypeError('Argument is not a function'); + } + return Function.prototype.apply.call(F, V, args); +} +function promiseCall(F, V, args) { + try { + return promiseResolvedWith(reflectCall(F, V, args)); + } + catch (value) { + return promiseRejectedWith(value); + } +} + +// Original from Chromium +// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js +const QUEUE_MAX_ARRAY_SIZE = 16384; +/** + * Simple queue structure. + * + * Avoids scalability issues with using a packed array directly by using + * multiple arrays in a linked list and keeping the array size bounded. + */ +class SimpleQueue { + constructor() { + this._cursor = 0; + this._size = 0; + // _front and _back are always defined. + this._front = { + _elements: [], + _next: undefined + }; + this._back = this._front; + // The cursor is used to avoid calling Array.shift(). + // It contains the index of the front element of the array inside the + // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE). + this._cursor = 0; + // When there is only one node, size === elements.length - cursor. + this._size = 0; + } + get length() { + return this._size; + } + // For exception safety, this method is structured in order: + // 1. Read state + // 2. Calculate required state mutations + // 3. Perform state mutations + push(element) { + const oldBack = this._back; + let newBack = oldBack; + if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) { + newBack = { + _elements: [], + _next: undefined + }; + } + // push() is the mutation most likely to throw an exception, so it + // goes first. + oldBack._elements.push(element); + if (newBack !== oldBack) { + this._back = newBack; + oldBack._next = newBack; + } + ++this._size; + } + // Like push(), shift() follows the read -> calculate -> mutate pattern for + // exception safety. + shift() { // must not be called on an empty queue + const oldFront = this._front; + let newFront = oldFront; + const oldCursor = this._cursor; + let newCursor = oldCursor + 1; + const elements = oldFront._elements; + const element = elements[oldCursor]; + if (newCursor === QUEUE_MAX_ARRAY_SIZE) { + newFront = oldFront._next; + newCursor = 0; + } + // No mutations before this point. + --this._size; + this._cursor = newCursor; + if (oldFront !== newFront) { + this._front = newFront; + } + // Permit shifted element to be garbage collected. + elements[oldCursor] = undefined; + return element; + } + // The tricky thing about forEach() is that it can be called + // re-entrantly. The queue may be mutated inside the callback. It is easy to + // see that push() within the callback has no negative effects since the end + // of the queue is checked for on every iteration. If shift() is called + // repeatedly within the callback then the next iteration may return an + // element that has been removed. In this case the callback will be called + // with undefined values until we either "catch up" with elements that still + // exist or reach the back of the queue. + forEach(callback) { + let i = this._cursor; + let node = this._front; + let elements = node._elements; + while (i !== elements.length || node._next !== undefined) { + if (i === elements.length) { + node = node._next; + elements = node._elements; + i = 0; + if (elements.length === 0) { + break; + } + } + callback(elements[i]); + ++i; + } + } + // Return the element that would be returned if shift() was called now, + // without modifying the queue. + peek() { // must not be called on an empty queue + const front = this._front; + const cursor = this._cursor; + return front._elements[cursor]; + } +} + +function ReadableStreamReaderGenericInitialize(reader, stream) { + reader._ownerReadableStream = stream; + stream._reader = reader; + if (stream._state === 'readable') { + defaultReaderClosedPromiseInitialize(reader); + } + else if (stream._state === 'closed') { + defaultReaderClosedPromiseInitializeAsResolved(reader); + } + else { + defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError); + } +} +// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state +// check. +function ReadableStreamReaderGenericCancel(reader, reason) { + const stream = reader._ownerReadableStream; + return ReadableStreamCancel(stream, reason); +} +function ReadableStreamReaderGenericRelease(reader) { + if (reader._ownerReadableStream._state === 'readable') { + defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`)); + } + else { + defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`)); + } + reader._ownerReadableStream._reader = undefined; + reader._ownerReadableStream = undefined; +} +// Helper functions for the readers. +function readerLockException(name) { + return new TypeError('Cannot ' + name + ' a stream using a released reader'); +} +// Helper functions for the ReadableStreamDefaultReader. +function defaultReaderClosedPromiseInitialize(reader) { + reader._closedPromise = newPromise((resolve, reject) => { + reader._closedPromise_resolve = resolve; + reader._closedPromise_reject = reject; + }); +} +function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) { + defaultReaderClosedPromiseInitialize(reader); + defaultReaderClosedPromiseReject(reader, reason); +} +function defaultReaderClosedPromiseInitializeAsResolved(reader) { + defaultReaderClosedPromiseInitialize(reader); + defaultReaderClosedPromiseResolve(reader); +} +function defaultReaderClosedPromiseReject(reader, reason) { + if (reader._closedPromise_reject === undefined) { + return; + } + setPromiseIsHandledToTrue(reader._closedPromise); + reader._closedPromise_reject(reason); + reader._closedPromise_resolve = undefined; + reader._closedPromise_reject = undefined; +} +function defaultReaderClosedPromiseResetToRejected(reader, reason) { + defaultReaderClosedPromiseInitializeAsRejected(reader, reason); +} +function defaultReaderClosedPromiseResolve(reader) { + if (reader._closedPromise_resolve === undefined) { + return; + } + reader._closedPromise_resolve(undefined); + reader._closedPromise_resolve = undefined; + reader._closedPromise_reject = undefined; +} + +const AbortSteps = SymbolPolyfill('[[AbortSteps]]'); +const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]'); +const CancelSteps = SymbolPolyfill('[[CancelSteps]]'); +const PullSteps = SymbolPolyfill('[[PullSteps]]'); + +/// +// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill +const NumberIsFinite = Number.isFinite || function (x) { + return typeof x === 'number' && isFinite(x); +}; + +/// +// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill +const MathTrunc = Math.trunc || function (v) { + return v < 0 ? Math.ceil(v) : Math.floor(v); +}; + +// https://heycam.github.io/webidl/#idl-dictionaries +function isDictionary(x) { + return typeof x === 'object' || typeof x === 'function'; +} +function assertDictionary(obj, context) { + if (obj !== undefined && !isDictionary(obj)) { + throw new TypeError(`${context} is not an object.`); + } +} +// https://heycam.github.io/webidl/#idl-callback-functions +function assertFunction(x, context) { + if (typeof x !== 'function') { + throw new TypeError(`${context} is not a function.`); + } +} +// https://heycam.github.io/webidl/#idl-object +function isObject(x) { + return (typeof x === 'object' && x !== null) || typeof x === 'function'; +} +function assertObject(x, context) { + if (!isObject(x)) { + throw new TypeError(`${context} is not an object.`); + } +} +function assertRequiredArgument(x, position, context) { + if (x === undefined) { + throw new TypeError(`Parameter ${position} is required in '${context}'.`); + } +} +function assertRequiredField(x, field, context) { + if (x === undefined) { + throw new TypeError(`${field} is required in '${context}'.`); + } +} +// https://heycam.github.io/webidl/#idl-unrestricted-double +function convertUnrestrictedDouble(value) { + return Number(value); +} +function censorNegativeZero(x) { + return x === 0 ? 0 : x; +} +function integerPart(x) { + return censorNegativeZero(MathTrunc(x)); +} +// https://heycam.github.io/webidl/#idl-unsigned-long-long +function convertUnsignedLongLongWithEnforceRange(value, context) { + const lowerBound = 0; + const upperBound = Number.MAX_SAFE_INTEGER; + let x = Number(value); + x = censorNegativeZero(x); + if (!NumberIsFinite(x)) { + throw new TypeError(`${context} is not a finite number`); + } + x = integerPart(x); + if (x < lowerBound || x > upperBound) { + throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`); + } + if (!NumberIsFinite(x) || x === 0) { + return 0; + } + // TODO Use BigInt if supported? + // let xBigInt = BigInt(integerPart(x)); + // xBigInt = BigInt.asUintN(64, xBigInt); + // return Number(xBigInt); + return x; +} + +function assertReadableStream(x, context) { + if (!IsReadableStream(x)) { + throw new TypeError(`${context} is not a ReadableStream.`); + } +} + +// Abstract operations for the ReadableStream. +function AcquireReadableStreamDefaultReader(stream) { + return new ReadableStreamDefaultReader(stream); +} +// ReadableStream API exposed for controllers. +function ReadableStreamAddReadRequest(stream, readRequest) { + stream._reader._readRequests.push(readRequest); +} +function ReadableStreamFulfillReadRequest(stream, chunk, done) { + const reader = stream._reader; + const readRequest = reader._readRequests.shift(); + if (done) { + readRequest._closeSteps(); + } + else { + readRequest._chunkSteps(chunk); + } +} +function ReadableStreamGetNumReadRequests(stream) { + return stream._reader._readRequests.length; +} +function ReadableStreamHasDefaultReader(stream) { + const reader = stream._reader; + if (reader === undefined) { + return false; + } + if (!IsReadableStreamDefaultReader(reader)) { + return false; + } + return true; +} +/** + * A default reader vended by a {@link ReadableStream}. + * + * @public + */ +class ReadableStreamDefaultReader { + constructor(stream) { + assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader'); + assertReadableStream(stream, 'First parameter'); + if (IsReadableStreamLocked(stream)) { + throw new TypeError('This stream has already been locked for exclusive reading by another reader'); + } + ReadableStreamReaderGenericInitialize(this, stream); + this._readRequests = new SimpleQueue(); + } + /** + * Returns a promise that will be fulfilled when the stream becomes closed, + * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing. + */ + get closed() { + if (!IsReadableStreamDefaultReader(this)) { + return promiseRejectedWith(defaultReaderBrandCheckException('closed')); + } + return this._closedPromise; + } + /** + * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}. + */ + cancel(reason = undefined) { + if (!IsReadableStreamDefaultReader(this)) { + return promiseRejectedWith(defaultReaderBrandCheckException('cancel')); + } + if (this._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('cancel')); + } + return ReadableStreamReaderGenericCancel(this, reason); + } + /** + * Returns a promise that allows access to the next chunk from the stream's internal queue, if available. + * + * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source. + */ + read() { + if (!IsReadableStreamDefaultReader(this)) { + return promiseRejectedWith(defaultReaderBrandCheckException('read')); + } + if (this._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('read from')); + } + let resolvePromise; + let rejectPromise; + const promise = newPromise((resolve, reject) => { + resolvePromise = resolve; + rejectPromise = reject; + }); + const readRequest = { + _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }), + _closeSteps: () => resolvePromise({ value: undefined, done: true }), + _errorSteps: e => rejectPromise(e) + }; + ReadableStreamDefaultReaderRead(this, readRequest); + return promise; + } + /** + * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active. + * If the associated stream is errored when the lock is released, the reader will appear errored in the same way + * from now on; otherwise, the reader will appear closed. + * + * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by + * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to + * do so will throw a `TypeError` and leave the reader locked to the stream. + */ + releaseLock() { + if (!IsReadableStreamDefaultReader(this)) { + throw defaultReaderBrandCheckException('releaseLock'); + } + if (this._ownerReadableStream === undefined) { + return; + } + if (this._readRequests.length > 0) { + throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled'); + } + ReadableStreamReaderGenericRelease(this); + } +} +Object.defineProperties(ReadableStreamDefaultReader.prototype, { + cancel: { enumerable: true }, + read: { enumerable: true }, + releaseLock: { enumerable: true }, + closed: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableStreamDefaultReader', + configurable: true + }); +} +// Abstract operations for the readers. +function IsReadableStreamDefaultReader(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) { + return false; + } + return x instanceof ReadableStreamDefaultReader; +} +function ReadableStreamDefaultReaderRead(reader, readRequest) { + const stream = reader._ownerReadableStream; + stream._disturbed = true; + if (stream._state === 'closed') { + readRequest._closeSteps(); + } + else if (stream._state === 'errored') { + readRequest._errorSteps(stream._storedError); + } + else { + stream._readableStreamController[PullSteps](readRequest); + } +} +// Helper functions for the ReadableStreamDefaultReader. +function defaultReaderBrandCheckException(name) { + return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`); +} + +/// +let AsyncIteratorPrototype; +if (typeof SymbolPolyfill.asyncIterator === 'symbol') { + // We're running inside a ES2018+ environment, but we're compiling to an older syntax. + // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it. + AsyncIteratorPrototype = { + // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( ) + // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator + [SymbolPolyfill.asyncIterator]() { + return this; + } + }; + Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false }); +} + +/// +class ReadableStreamAsyncIteratorImpl { + constructor(reader, preventCancel) { + this._ongoingPromise = undefined; + this._isFinished = false; + this._reader = reader; + this._preventCancel = preventCancel; + } + next() { + const nextSteps = () => this._nextSteps(); + this._ongoingPromise = this._ongoingPromise ? + transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) : + nextSteps(); + return this._ongoingPromise; + } + return(value) { + const returnSteps = () => this._returnSteps(value); + return this._ongoingPromise ? + transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) : + returnSteps(); + } + _nextSteps() { + if (this._isFinished) { + return Promise.resolve({ value: undefined, done: true }); + } + const reader = this._reader; + if (reader._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('iterate')); + } + let resolvePromise; + let rejectPromise; + const promise = newPromise((resolve, reject) => { + resolvePromise = resolve; + rejectPromise = reject; + }); + const readRequest = { + _chunkSteps: chunk => { + this._ongoingPromise = undefined; + // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test. + // FIXME Is this a bug in the specification, or in the test? + queueMicrotask(() => resolvePromise({ value: chunk, done: false })); + }, + _closeSteps: () => { + this._ongoingPromise = undefined; + this._isFinished = true; + ReadableStreamReaderGenericRelease(reader); + resolvePromise({ value: undefined, done: true }); + }, + _errorSteps: reason => { + this._ongoingPromise = undefined; + this._isFinished = true; + ReadableStreamReaderGenericRelease(reader); + rejectPromise(reason); + } + }; + ReadableStreamDefaultReaderRead(reader, readRequest); + return promise; + } + _returnSteps(value) { + if (this._isFinished) { + return Promise.resolve({ value, done: true }); + } + this._isFinished = true; + const reader = this._reader; + if (reader._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('finish iterating')); + } + if (!this._preventCancel) { + const result = ReadableStreamReaderGenericCancel(reader, value); + ReadableStreamReaderGenericRelease(reader); + return transformPromiseWith(result, () => ({ value, done: true })); + } + ReadableStreamReaderGenericRelease(reader); + return promiseResolvedWith({ value, done: true }); + } +} +const ReadableStreamAsyncIteratorPrototype = { + next() { + if (!IsReadableStreamAsyncIterator(this)) { + return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next')); + } + return this._asyncIteratorImpl.next(); + }, + return(value) { + if (!IsReadableStreamAsyncIterator(this)) { + return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return')); + } + return this._asyncIteratorImpl.return(value); + } +}; +if (AsyncIteratorPrototype !== undefined) { + Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype); +} +// Abstract operations for the ReadableStream. +function AcquireReadableStreamAsyncIterator(stream, preventCancel) { + const reader = AcquireReadableStreamDefaultReader(stream); + const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel); + const iterator = Object.create(ReadableStreamAsyncIteratorPrototype); + iterator._asyncIteratorImpl = impl; + return iterator; +} +function IsReadableStreamAsyncIterator(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) { + return false; + } + try { + // noinspection SuspiciousTypeOfGuard + return x._asyncIteratorImpl instanceof + ReadableStreamAsyncIteratorImpl; + } + catch (_a) { + return false; + } +} +// Helper functions for the ReadableStream. +function streamAsyncIteratorBrandCheckException(name) { + return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`); +} + +/// +// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill +const NumberIsNaN = Number.isNaN || function (x) { + // eslint-disable-next-line no-self-compare + return x !== x; +}; + +function CreateArrayFromList(elements) { + // We use arrays to represent lists, so this is basically a no-op. + // Do a slice though just in case we happen to depend on the unique-ness. + return elements.slice(); +} +function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) { + new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset); +} +// Not implemented correctly +function TransferArrayBuffer(O) { + return O; +} +// Not implemented correctly +// eslint-disable-next-line @typescript-eslint/no-unused-vars +function IsDetachedBuffer(O) { + return false; +} +function ArrayBufferSlice(buffer, begin, end) { + // ArrayBuffer.prototype.slice is not available on IE10 + // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice + if (buffer.slice) { + return buffer.slice(begin, end); + } + const length = end - begin; + const slice = new ArrayBuffer(length); + CopyDataBlockBytes(slice, 0, buffer, begin, length); + return slice; +} + +function IsNonNegativeNumber(v) { + if (typeof v !== 'number') { + return false; + } + if (NumberIsNaN(v)) { + return false; + } + if (v < 0) { + return false; + } + return true; +} +function CloneAsUint8Array(O) { + const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength); + return new Uint8Array(buffer); +} + +function DequeueValue(container) { + const pair = container._queue.shift(); + container._queueTotalSize -= pair.size; + if (container._queueTotalSize < 0) { + container._queueTotalSize = 0; + } + return pair.value; +} +function EnqueueValueWithSize(container, value, size) { + if (!IsNonNegativeNumber(size) || size === Infinity) { + throw new RangeError('Size must be a finite, non-NaN, non-negative number.'); + } + container._queue.push({ value, size }); + container._queueTotalSize += size; +} +function PeekQueueValue(container) { + const pair = container._queue.peek(); + return pair.value; +} +function ResetQueue(container) { + container._queue = new SimpleQueue(); + container._queueTotalSize = 0; +} + +/** + * A pull-into request in a {@link ReadableByteStreamController}. + * + * @public + */ +class ReadableStreamBYOBRequest { + constructor() { + throw new TypeError('Illegal constructor'); + } + /** + * Returns the view for writing in to, or `null` if the BYOB request has already been responded to. + */ + get view() { + if (!IsReadableStreamBYOBRequest(this)) { + throw byobRequestBrandCheckException('view'); + } + return this._view; + } + respond(bytesWritten) { + if (!IsReadableStreamBYOBRequest(this)) { + throw byobRequestBrandCheckException('respond'); + } + assertRequiredArgument(bytesWritten, 1, 'respond'); + bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter'); + if (this._associatedReadableByteStreamController === undefined) { + throw new TypeError('This BYOB request has been invalidated'); + } + if (IsDetachedBuffer(this._view.buffer)) ; + ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten); + } + respondWithNewView(view) { + if (!IsReadableStreamBYOBRequest(this)) { + throw byobRequestBrandCheckException('respondWithNewView'); + } + assertRequiredArgument(view, 1, 'respondWithNewView'); + if (!ArrayBuffer.isView(view)) { + throw new TypeError('You can only respond with array buffer views'); + } + if (this._associatedReadableByteStreamController === undefined) { + throw new TypeError('This BYOB request has been invalidated'); + } + if (IsDetachedBuffer(view.buffer)) ; + ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view); + } +} +Object.defineProperties(ReadableStreamBYOBRequest.prototype, { + respond: { enumerable: true }, + respondWithNewView: { enumerable: true }, + view: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableStreamBYOBRequest', + configurable: true + }); +} +/** + * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue. + * + * @public + */ +class ReadableByteStreamController { + constructor() { + throw new TypeError('Illegal constructor'); + } + /** + * Returns the current BYOB pull request, or `null` if there isn't one. + */ + get byobRequest() { + if (!IsReadableByteStreamController(this)) { + throw byteStreamControllerBrandCheckException('byobRequest'); + } + return ReadableByteStreamControllerGetBYOBRequest(this); + } + /** + * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is + * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure. + */ + get desiredSize() { + if (!IsReadableByteStreamController(this)) { + throw byteStreamControllerBrandCheckException('desiredSize'); + } + return ReadableByteStreamControllerGetDesiredSize(this); + } + /** + * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from + * the stream, but once those are read, the stream will become closed. + */ + close() { + if (!IsReadableByteStreamController(this)) { + throw byteStreamControllerBrandCheckException('close'); + } + if (this._closeRequested) { + throw new TypeError('The stream has already been closed; do not close it again!'); + } + const state = this._controlledReadableByteStream._state; + if (state !== 'readable') { + throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`); + } + ReadableByteStreamControllerClose(this); + } + enqueue(chunk) { + if (!IsReadableByteStreamController(this)) { + throw byteStreamControllerBrandCheckException('enqueue'); + } + assertRequiredArgument(chunk, 1, 'enqueue'); + if (!ArrayBuffer.isView(chunk)) { + throw new TypeError('chunk must be an array buffer view'); + } + if (chunk.byteLength === 0) { + throw new TypeError('chunk must have non-zero byteLength'); + } + if (chunk.buffer.byteLength === 0) { + throw new TypeError(`chunk's buffer must have non-zero byteLength`); + } + if (this._closeRequested) { + throw new TypeError('stream is closed or draining'); + } + const state = this._controlledReadableByteStream._state; + if (state !== 'readable') { + throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`); + } + ReadableByteStreamControllerEnqueue(this, chunk); + } + /** + * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`. + */ + error(e = undefined) { + if (!IsReadableByteStreamController(this)) { + throw byteStreamControllerBrandCheckException('error'); + } + ReadableByteStreamControllerError(this, e); + } + /** @internal */ + [CancelSteps](reason) { + ReadableByteStreamControllerClearPendingPullIntos(this); + ResetQueue(this); + const result = this._cancelAlgorithm(reason); + ReadableByteStreamControllerClearAlgorithms(this); + return result; + } + /** @internal */ + [PullSteps](readRequest) { + const stream = this._controlledReadableByteStream; + if (this._queueTotalSize > 0) { + const entry = this._queue.shift(); + this._queueTotalSize -= entry.byteLength; + ReadableByteStreamControllerHandleQueueDrain(this); + const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength); + readRequest._chunkSteps(view); + return; + } + const autoAllocateChunkSize = this._autoAllocateChunkSize; + if (autoAllocateChunkSize !== undefined) { + let buffer; + try { + buffer = new ArrayBuffer(autoAllocateChunkSize); + } + catch (bufferE) { + readRequest._errorSteps(bufferE); + return; + } + const pullIntoDescriptor = { + buffer, + bufferByteLength: autoAllocateChunkSize, + byteOffset: 0, + byteLength: autoAllocateChunkSize, + bytesFilled: 0, + elementSize: 1, + viewConstructor: Uint8Array, + readerType: 'default' + }; + this._pendingPullIntos.push(pullIntoDescriptor); + } + ReadableStreamAddReadRequest(stream, readRequest); + ReadableByteStreamControllerCallPullIfNeeded(this); + } +} +Object.defineProperties(ReadableByteStreamController.prototype, { + close: { enumerable: true }, + enqueue: { enumerable: true }, + error: { enumerable: true }, + byobRequest: { enumerable: true }, + desiredSize: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableByteStreamController', + configurable: true + }); +} +// Abstract operations for the ReadableByteStreamController. +function IsReadableByteStreamController(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) { + return false; + } + return x instanceof ReadableByteStreamController; +} +function IsReadableStreamBYOBRequest(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) { + return false; + } + return x instanceof ReadableStreamBYOBRequest; +} +function ReadableByteStreamControllerCallPullIfNeeded(controller) { + const shouldPull = ReadableByteStreamControllerShouldCallPull(controller); + if (!shouldPull) { + return; + } + if (controller._pulling) { + controller._pullAgain = true; + return; + } + controller._pulling = true; + // TODO: Test controller argument + const pullPromise = controller._pullAlgorithm(); + uponPromise(pullPromise, () => { + controller._pulling = false; + if (controller._pullAgain) { + controller._pullAgain = false; + ReadableByteStreamControllerCallPullIfNeeded(controller); + } + }, e => { + ReadableByteStreamControllerError(controller, e); + }); +} +function ReadableByteStreamControllerClearPendingPullIntos(controller) { + ReadableByteStreamControllerInvalidateBYOBRequest(controller); + controller._pendingPullIntos = new SimpleQueue(); +} +function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) { + let done = false; + if (stream._state === 'closed') { + done = true; + } + const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor); + if (pullIntoDescriptor.readerType === 'default') { + ReadableStreamFulfillReadRequest(stream, filledView, done); + } + else { + ReadableStreamFulfillReadIntoRequest(stream, filledView, done); + } +} +function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) { + const bytesFilled = pullIntoDescriptor.bytesFilled; + const elementSize = pullIntoDescriptor.elementSize; + return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize); +} +function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) { + controller._queue.push({ buffer, byteOffset, byteLength }); + controller._queueTotalSize += byteLength; +} +function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) { + const elementSize = pullIntoDescriptor.elementSize; + const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize; + const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled); + const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy; + const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize; + let totalBytesToCopyRemaining = maxBytesToCopy; + let ready = false; + if (maxAlignedBytes > currentAlignedBytes) { + totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled; + ready = true; + } + const queue = controller._queue; + while (totalBytesToCopyRemaining > 0) { + const headOfQueue = queue.peek(); + const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength); + const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled; + CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy); + if (headOfQueue.byteLength === bytesToCopy) { + queue.shift(); + } + else { + headOfQueue.byteOffset += bytesToCopy; + headOfQueue.byteLength -= bytesToCopy; + } + controller._queueTotalSize -= bytesToCopy; + ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor); + totalBytesToCopyRemaining -= bytesToCopy; + } + return ready; +} +function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) { + pullIntoDescriptor.bytesFilled += size; +} +function ReadableByteStreamControllerHandleQueueDrain(controller) { + if (controller._queueTotalSize === 0 && controller._closeRequested) { + ReadableByteStreamControllerClearAlgorithms(controller); + ReadableStreamClose(controller._controlledReadableByteStream); + } + else { + ReadableByteStreamControllerCallPullIfNeeded(controller); + } +} +function ReadableByteStreamControllerInvalidateBYOBRequest(controller) { + if (controller._byobRequest === null) { + return; + } + controller._byobRequest._associatedReadableByteStreamController = undefined; + controller._byobRequest._view = null; + controller._byobRequest = null; +} +function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) { + while (controller._pendingPullIntos.length > 0) { + if (controller._queueTotalSize === 0) { + return; + } + const pullIntoDescriptor = controller._pendingPullIntos.peek(); + if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) { + ReadableByteStreamControllerShiftPendingPullInto(controller); + ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor); + } + } +} +function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) { + const stream = controller._controlledReadableByteStream; + let elementSize = 1; + if (view.constructor !== DataView) { + elementSize = view.constructor.BYTES_PER_ELEMENT; + } + const ctor = view.constructor; + // try { + const buffer = TransferArrayBuffer(view.buffer); + // } catch (e) { + // readIntoRequest._errorSteps(e); + // return; + // } + const pullIntoDescriptor = { + buffer, + bufferByteLength: buffer.byteLength, + byteOffset: view.byteOffset, + byteLength: view.byteLength, + bytesFilled: 0, + elementSize, + viewConstructor: ctor, + readerType: 'byob' + }; + if (controller._pendingPullIntos.length > 0) { + controller._pendingPullIntos.push(pullIntoDescriptor); + // No ReadableByteStreamControllerCallPullIfNeeded() call since: + // - No change happens on desiredSize + // - The source has already been notified of that there's at least 1 pending read(view) + ReadableStreamAddReadIntoRequest(stream, readIntoRequest); + return; + } + if (stream._state === 'closed') { + const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0); + readIntoRequest._closeSteps(emptyView); + return; + } + if (controller._queueTotalSize > 0) { + if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) { + const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor); + ReadableByteStreamControllerHandleQueueDrain(controller); + readIntoRequest._chunkSteps(filledView); + return; + } + if (controller._closeRequested) { + const e = new TypeError('Insufficient bytes to fill elements in the given buffer'); + ReadableByteStreamControllerError(controller, e); + readIntoRequest._errorSteps(e); + return; + } + } + controller._pendingPullIntos.push(pullIntoDescriptor); + ReadableStreamAddReadIntoRequest(stream, readIntoRequest); + ReadableByteStreamControllerCallPullIfNeeded(controller); +} +function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) { + const stream = controller._controlledReadableByteStream; + if (ReadableStreamHasBYOBReader(stream)) { + while (ReadableStreamGetNumReadIntoRequests(stream) > 0) { + const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller); + ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor); + } + } +} +function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) { + ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor); + if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) { + return; + } + ReadableByteStreamControllerShiftPendingPullInto(controller); + const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize; + if (remainderSize > 0) { + const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled; + const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end); + ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength); + } + pullIntoDescriptor.bytesFilled -= remainderSize; + ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor); + ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller); +} +function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) { + const firstDescriptor = controller._pendingPullIntos.peek(); + ReadableByteStreamControllerInvalidateBYOBRequest(controller); + const state = controller._controlledReadableByteStream._state; + if (state === 'closed') { + ReadableByteStreamControllerRespondInClosedState(controller); + } + else { + ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor); + } + ReadableByteStreamControllerCallPullIfNeeded(controller); +} +function ReadableByteStreamControllerShiftPendingPullInto(controller) { + const descriptor = controller._pendingPullIntos.shift(); + return descriptor; +} +function ReadableByteStreamControllerShouldCallPull(controller) { + const stream = controller._controlledReadableByteStream; + if (stream._state !== 'readable') { + return false; + } + if (controller._closeRequested) { + return false; + } + if (!controller._started) { + return false; + } + if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) { + return true; + } + if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) { + return true; + } + const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller); + if (desiredSize > 0) { + return true; + } + return false; +} +function ReadableByteStreamControllerClearAlgorithms(controller) { + controller._pullAlgorithm = undefined; + controller._cancelAlgorithm = undefined; +} +// A client of ReadableByteStreamController may use these functions directly to bypass state check. +function ReadableByteStreamControllerClose(controller) { + const stream = controller._controlledReadableByteStream; + if (controller._closeRequested || stream._state !== 'readable') { + return; + } + if (controller._queueTotalSize > 0) { + controller._closeRequested = true; + return; + } + if (controller._pendingPullIntos.length > 0) { + const firstPendingPullInto = controller._pendingPullIntos.peek(); + if (firstPendingPullInto.bytesFilled > 0) { + const e = new TypeError('Insufficient bytes to fill elements in the given buffer'); + ReadableByteStreamControllerError(controller, e); + throw e; + } + } + ReadableByteStreamControllerClearAlgorithms(controller); + ReadableStreamClose(stream); +} +function ReadableByteStreamControllerEnqueue(controller, chunk) { + const stream = controller._controlledReadableByteStream; + if (controller._closeRequested || stream._state !== 'readable') { + return; + } + const buffer = chunk.buffer; + const byteOffset = chunk.byteOffset; + const byteLength = chunk.byteLength; + const transferredBuffer = TransferArrayBuffer(buffer); + if (controller._pendingPullIntos.length > 0) { + const firstPendingPullInto = controller._pendingPullIntos.peek(); + if (IsDetachedBuffer(firstPendingPullInto.buffer)) ; + firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer); + } + ReadableByteStreamControllerInvalidateBYOBRequest(controller); + if (ReadableStreamHasDefaultReader(stream)) { + if (ReadableStreamGetNumReadRequests(stream) === 0) { + ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength); + } + else { + if (controller._pendingPullIntos.length > 0) { + ReadableByteStreamControllerShiftPendingPullInto(controller); + } + const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength); + ReadableStreamFulfillReadRequest(stream, transferredView, false); + } + } + else if (ReadableStreamHasBYOBReader(stream)) { + // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully. + ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength); + ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller); + } + else { + ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength); + } + ReadableByteStreamControllerCallPullIfNeeded(controller); +} +function ReadableByteStreamControllerError(controller, e) { + const stream = controller._controlledReadableByteStream; + if (stream._state !== 'readable') { + return; + } + ReadableByteStreamControllerClearPendingPullIntos(controller); + ResetQueue(controller); + ReadableByteStreamControllerClearAlgorithms(controller); + ReadableStreamError(stream, e); +} +function ReadableByteStreamControllerGetBYOBRequest(controller) { + if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) { + const firstDescriptor = controller._pendingPullIntos.peek(); + const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled); + const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype); + SetUpReadableStreamBYOBRequest(byobRequest, controller, view); + controller._byobRequest = byobRequest; + } + return controller._byobRequest; +} +function ReadableByteStreamControllerGetDesiredSize(controller) { + const state = controller._controlledReadableByteStream._state; + if (state === 'errored') { + return null; + } + if (state === 'closed') { + return 0; + } + return controller._strategyHWM - controller._queueTotalSize; +} +function ReadableByteStreamControllerRespond(controller, bytesWritten) { + const firstDescriptor = controller._pendingPullIntos.peek(); + const state = controller._controlledReadableByteStream._state; + if (state === 'closed') { + if (bytesWritten !== 0) { + throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream'); + } + } + else { + if (bytesWritten === 0) { + throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream'); + } + if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) { + throw new RangeError('bytesWritten out of range'); + } + } + firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer); + ReadableByteStreamControllerRespondInternal(controller, bytesWritten); +} +function ReadableByteStreamControllerRespondWithNewView(controller, view) { + const firstDescriptor = controller._pendingPullIntos.peek(); + const state = controller._controlledReadableByteStream._state; + if (state === 'closed') { + if (view.byteLength !== 0) { + throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream'); + } + } + else { + if (view.byteLength === 0) { + throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'); + } + } + if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) { + throw new RangeError('The region specified by view does not match byobRequest'); + } + if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) { + throw new RangeError('The buffer of view has different capacity than byobRequest'); + } + if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) { + throw new RangeError('The region specified by view is larger than byobRequest'); + } + const viewByteLength = view.byteLength; + firstDescriptor.buffer = TransferArrayBuffer(view.buffer); + ReadableByteStreamControllerRespondInternal(controller, viewByteLength); +} +function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) { + controller._controlledReadableByteStream = stream; + controller._pullAgain = false; + controller._pulling = false; + controller._byobRequest = null; + // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly. + controller._queue = controller._queueTotalSize = undefined; + ResetQueue(controller); + controller._closeRequested = false; + controller._started = false; + controller._strategyHWM = highWaterMark; + controller._pullAlgorithm = pullAlgorithm; + controller._cancelAlgorithm = cancelAlgorithm; + controller._autoAllocateChunkSize = autoAllocateChunkSize; + controller._pendingPullIntos = new SimpleQueue(); + stream._readableStreamController = controller; + const startResult = startAlgorithm(); + uponPromise(promiseResolvedWith(startResult), () => { + controller._started = true; + ReadableByteStreamControllerCallPullIfNeeded(controller); + }, r => { + ReadableByteStreamControllerError(controller, r); + }); +} +function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) { + const controller = Object.create(ReadableByteStreamController.prototype); + let startAlgorithm = () => undefined; + let pullAlgorithm = () => promiseResolvedWith(undefined); + let cancelAlgorithm = () => promiseResolvedWith(undefined); + if (underlyingByteSource.start !== undefined) { + startAlgorithm = () => underlyingByteSource.start(controller); + } + if (underlyingByteSource.pull !== undefined) { + pullAlgorithm = () => underlyingByteSource.pull(controller); + } + if (underlyingByteSource.cancel !== undefined) { + cancelAlgorithm = reason => underlyingByteSource.cancel(reason); + } + const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize; + if (autoAllocateChunkSize === 0) { + throw new TypeError('autoAllocateChunkSize must be greater than 0'); + } + SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize); +} +function SetUpReadableStreamBYOBRequest(request, controller, view) { + request._associatedReadableByteStreamController = controller; + request._view = view; +} +// Helper functions for the ReadableStreamBYOBRequest. +function byobRequestBrandCheckException(name) { + return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`); +} +// Helper functions for the ReadableByteStreamController. +function byteStreamControllerBrandCheckException(name) { + return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`); +} + +// Abstract operations for the ReadableStream. +function AcquireReadableStreamBYOBReader(stream) { + return new ReadableStreamBYOBReader(stream); +} +// ReadableStream API exposed for controllers. +function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) { + stream._reader._readIntoRequests.push(readIntoRequest); +} +function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) { + const reader = stream._reader; + const readIntoRequest = reader._readIntoRequests.shift(); + if (done) { + readIntoRequest._closeSteps(chunk); + } + else { + readIntoRequest._chunkSteps(chunk); + } +} +function ReadableStreamGetNumReadIntoRequests(stream) { + return stream._reader._readIntoRequests.length; +} +function ReadableStreamHasBYOBReader(stream) { + const reader = stream._reader; + if (reader === undefined) { + return false; + } + if (!IsReadableStreamBYOBReader(reader)) { + return false; + } + return true; +} +/** + * A BYOB reader vended by a {@link ReadableStream}. + * + * @public + */ +class ReadableStreamBYOBReader { + constructor(stream) { + assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader'); + assertReadableStream(stream, 'First parameter'); + if (IsReadableStreamLocked(stream)) { + throw new TypeError('This stream has already been locked for exclusive reading by another reader'); + } + if (!IsReadableByteStreamController(stream._readableStreamController)) { + throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' + + 'source'); + } + ReadableStreamReaderGenericInitialize(this, stream); + this._readIntoRequests = new SimpleQueue(); + } + /** + * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or + * the reader's lock is released before the stream finishes closing. + */ + get closed() { + if (!IsReadableStreamBYOBReader(this)) { + return promiseRejectedWith(byobReaderBrandCheckException('closed')); + } + return this._closedPromise; + } + /** + * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}. + */ + cancel(reason = undefined) { + if (!IsReadableStreamBYOBReader(this)) { + return promiseRejectedWith(byobReaderBrandCheckException('cancel')); + } + if (this._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('cancel')); + } + return ReadableStreamReaderGenericCancel(this, reason); + } + /** + * Attempts to reads bytes into view, and returns a promise resolved with the result. + * + * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source. + */ + read(view) { + if (!IsReadableStreamBYOBReader(this)) { + return promiseRejectedWith(byobReaderBrandCheckException('read')); + } + if (!ArrayBuffer.isView(view)) { + return promiseRejectedWith(new TypeError('view must be an array buffer view')); + } + if (view.byteLength === 0) { + return promiseRejectedWith(new TypeError('view must have non-zero byteLength')); + } + if (view.buffer.byteLength === 0) { + return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`)); + } + if (IsDetachedBuffer(view.buffer)) ; + if (this._ownerReadableStream === undefined) { + return promiseRejectedWith(readerLockException('read from')); + } + let resolvePromise; + let rejectPromise; + const promise = newPromise((resolve, reject) => { + resolvePromise = resolve; + rejectPromise = reject; + }); + const readIntoRequest = { + _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }), + _closeSteps: chunk => resolvePromise({ value: chunk, done: true }), + _errorSteps: e => rejectPromise(e) + }; + ReadableStreamBYOBReaderRead(this, view, readIntoRequest); + return promise; + } + /** + * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active. + * If the associated stream is errored when the lock is released, the reader will appear errored in the same way + * from now on; otherwise, the reader will appear closed. + * + * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by + * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to + * do so will throw a `TypeError` and leave the reader locked to the stream. + */ + releaseLock() { + if (!IsReadableStreamBYOBReader(this)) { + throw byobReaderBrandCheckException('releaseLock'); + } + if (this._ownerReadableStream === undefined) { + return; + } + if (this._readIntoRequests.length > 0) { + throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled'); + } + ReadableStreamReaderGenericRelease(this); + } +} +Object.defineProperties(ReadableStreamBYOBReader.prototype, { + cancel: { enumerable: true }, + read: { enumerable: true }, + releaseLock: { enumerable: true }, + closed: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableStreamBYOBReader', + configurable: true + }); +} +// Abstract operations for the readers. +function IsReadableStreamBYOBReader(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) { + return false; + } + return x instanceof ReadableStreamBYOBReader; +} +function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) { + const stream = reader._ownerReadableStream; + stream._disturbed = true; + if (stream._state === 'errored') { + readIntoRequest._errorSteps(stream._storedError); + } + else { + ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest); + } +} +// Helper functions for the ReadableStreamBYOBReader. +function byobReaderBrandCheckException(name) { + return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`); +} + +function ExtractHighWaterMark(strategy, defaultHWM) { + const { highWaterMark } = strategy; + if (highWaterMark === undefined) { + return defaultHWM; + } + if (NumberIsNaN(highWaterMark) || highWaterMark < 0) { + throw new RangeError('Invalid highWaterMark'); + } + return highWaterMark; +} +function ExtractSizeAlgorithm(strategy) { + const { size } = strategy; + if (!size) { + return () => 1; + } + return size; +} + +function convertQueuingStrategy(init, context) { + assertDictionary(init, context); + const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark; + const size = init === null || init === void 0 ? void 0 : init.size; + return { + highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark), + size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`) + }; +} +function convertQueuingStrategySize(fn, context) { + assertFunction(fn, context); + return chunk => convertUnrestrictedDouble(fn(chunk)); +} + +function convertUnderlyingSink(original, context) { + assertDictionary(original, context); + const abort = original === null || original === void 0 ? void 0 : original.abort; + const close = original === null || original === void 0 ? void 0 : original.close; + const start = original === null || original === void 0 ? void 0 : original.start; + const type = original === null || original === void 0 ? void 0 : original.type; + const write = original === null || original === void 0 ? void 0 : original.write; + return { + abort: abort === undefined ? + undefined : + convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`), + close: close === undefined ? + undefined : + convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`), + start: start === undefined ? + undefined : + convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`), + write: write === undefined ? + undefined : + convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`), + type + }; +} +function convertUnderlyingSinkAbortCallback(fn, original, context) { + assertFunction(fn, context); + return (reason) => promiseCall(fn, original, [reason]); +} +function convertUnderlyingSinkCloseCallback(fn, original, context) { + assertFunction(fn, context); + return () => promiseCall(fn, original, []); +} +function convertUnderlyingSinkStartCallback(fn, original, context) { + assertFunction(fn, context); + return (controller) => reflectCall(fn, original, [controller]); +} +function convertUnderlyingSinkWriteCallback(fn, original, context) { + assertFunction(fn, context); + return (chunk, controller) => promiseCall(fn, original, [chunk, controller]); +} + +function assertWritableStream(x, context) { + if (!IsWritableStream(x)) { + throw new TypeError(`${context} is not a WritableStream.`); + } +} + +function isAbortSignal(value) { + if (typeof value !== 'object' || value === null) { + return false; + } + try { + return typeof value.aborted === 'boolean'; + } + catch (_a) { + // AbortSignal.prototype.aborted throws if its brand check fails + return false; + } +} +const supportsAbortController = typeof AbortController === 'function'; +/** + * Construct a new AbortController, if supported by the platform. + * + * @internal + */ +function createAbortController() { + if (supportsAbortController) { + return new AbortController(); + } + return undefined; +} + +/** + * A writable stream represents a destination for data, into which you can write. + * + * @public + */ +class WritableStream { + constructor(rawUnderlyingSink = {}, rawStrategy = {}) { + if (rawUnderlyingSink === undefined) { + rawUnderlyingSink = null; + } + else { + assertObject(rawUnderlyingSink, 'First parameter'); + } + const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter'); + const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter'); + InitializeWritableStream(this); + const type = underlyingSink.type; + if (type !== undefined) { + throw new RangeError('Invalid type is specified'); + } + const sizeAlgorithm = ExtractSizeAlgorithm(strategy); + const highWaterMark = ExtractHighWaterMark(strategy, 1); + SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm); + } + /** + * Returns whether or not the writable stream is locked to a writer. + */ + get locked() { + if (!IsWritableStream(this)) { + throw streamBrandCheckException$2('locked'); + } + return IsWritableStreamLocked(this); + } + /** + * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be + * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort + * mechanism of the underlying sink. + * + * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled + * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel + * the stream) if the stream is currently locked. + */ + abort(reason = undefined) { + if (!IsWritableStream(this)) { + return promiseRejectedWith(streamBrandCheckException$2('abort')); + } + if (IsWritableStreamLocked(this)) { + return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer')); + } + return WritableStreamAbort(this, reason); + } + /** + * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its + * close behavior. During this time any further attempts to write will fail (without erroring the stream). + * + * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream + * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with + * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked. + */ + close() { + if (!IsWritableStream(this)) { + return promiseRejectedWith(streamBrandCheckException$2('close')); + } + if (IsWritableStreamLocked(this)) { + return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer')); + } + if (WritableStreamCloseQueuedOrInFlight(this)) { + return promiseRejectedWith(new TypeError('Cannot close an already-closing stream')); + } + return WritableStreamClose(this); + } + /** + * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream + * is locked, no other writer can be acquired until this one is released. + * + * This functionality is especially useful for creating abstractions that desire the ability to write to a stream + * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at + * the same time, which would cause the resulting written data to be unpredictable and probably useless. + */ + getWriter() { + if (!IsWritableStream(this)) { + throw streamBrandCheckException$2('getWriter'); + } + return AcquireWritableStreamDefaultWriter(this); + } +} +Object.defineProperties(WritableStream.prototype, { + abort: { enumerable: true }, + close: { enumerable: true }, + getWriter: { enumerable: true }, + locked: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, { + value: 'WritableStream', + configurable: true + }); +} +// Abstract operations for the WritableStream. +function AcquireWritableStreamDefaultWriter(stream) { + return new WritableStreamDefaultWriter(stream); +} +// Throws if and only if startAlgorithm throws. +function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) { + const stream = Object.create(WritableStream.prototype); + InitializeWritableStream(stream); + const controller = Object.create(WritableStreamDefaultController.prototype); + SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm); + return stream; +} +function InitializeWritableStream(stream) { + stream._state = 'writable'; + // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is + // 'erroring' or 'errored'. May be set to an undefined value. + stream._storedError = undefined; + stream._writer = undefined; + // Initialize to undefined first because the constructor of the controller checks this + // variable to validate the caller. + stream._writableStreamController = undefined; + // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data + // producer without waiting for the queued writes to finish. + stream._writeRequests = new SimpleQueue(); + // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents + // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here. + stream._inFlightWriteRequest = undefined; + // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer + // has been detached. + stream._closeRequest = undefined; + // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it + // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here. + stream._inFlightCloseRequest = undefined; + // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached. + stream._pendingAbortRequest = undefined; + // The backpressure signal set by the controller. + stream._backpressure = false; +} +function IsWritableStream(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) { + return false; + } + return x instanceof WritableStream; +} +function IsWritableStreamLocked(stream) { + if (stream._writer === undefined) { + return false; + } + return true; +} +function WritableStreamAbort(stream, reason) { + var _a; + if (stream._state === 'closed' || stream._state === 'errored') { + return promiseResolvedWith(undefined); + } + stream._writableStreamController._abortReason = reason; + (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort(); + // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring', + // but it doesn't know that signaling abort runs author code that might have changed the state. + // Widen the type again by casting to WritableStreamState. + const state = stream._state; + if (state === 'closed' || state === 'errored') { + return promiseResolvedWith(undefined); + } + if (stream._pendingAbortRequest !== undefined) { + return stream._pendingAbortRequest._promise; + } + let wasAlreadyErroring = false; + if (state === 'erroring') { + wasAlreadyErroring = true; + // reason will not be used, so don't keep a reference to it. + reason = undefined; + } + const promise = newPromise((resolve, reject) => { + stream._pendingAbortRequest = { + _promise: undefined, + _resolve: resolve, + _reject: reject, + _reason: reason, + _wasAlreadyErroring: wasAlreadyErroring + }; + }); + stream._pendingAbortRequest._promise = promise; + if (!wasAlreadyErroring) { + WritableStreamStartErroring(stream, reason); + } + return promise; +} +function WritableStreamClose(stream) { + const state = stream._state; + if (state === 'closed' || state === 'errored') { + return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`)); + } + const promise = newPromise((resolve, reject) => { + const closeRequest = { + _resolve: resolve, + _reject: reject + }; + stream._closeRequest = closeRequest; + }); + const writer = stream._writer; + if (writer !== undefined && stream._backpressure && state === 'writable') { + defaultWriterReadyPromiseResolve(writer); + } + WritableStreamDefaultControllerClose(stream._writableStreamController); + return promise; +} +// WritableStream API exposed for controllers. +function WritableStreamAddWriteRequest(stream) { + const promise = newPromise((resolve, reject) => { + const writeRequest = { + _resolve: resolve, + _reject: reject + }; + stream._writeRequests.push(writeRequest); + }); + return promise; +} +function WritableStreamDealWithRejection(stream, error) { + const state = stream._state; + if (state === 'writable') { + WritableStreamStartErroring(stream, error); + return; + } + WritableStreamFinishErroring(stream); +} +function WritableStreamStartErroring(stream, reason) { + const controller = stream._writableStreamController; + stream._state = 'erroring'; + stream._storedError = reason; + const writer = stream._writer; + if (writer !== undefined) { + WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason); + } + if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) { + WritableStreamFinishErroring(stream); + } +} +function WritableStreamFinishErroring(stream) { + stream._state = 'errored'; + stream._writableStreamController[ErrorSteps](); + const storedError = stream._storedError; + stream._writeRequests.forEach(writeRequest => { + writeRequest._reject(storedError); + }); + stream._writeRequests = new SimpleQueue(); + if (stream._pendingAbortRequest === undefined) { + WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream); + return; + } + const abortRequest = stream._pendingAbortRequest; + stream._pendingAbortRequest = undefined; + if (abortRequest._wasAlreadyErroring) { + abortRequest._reject(storedError); + WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream); + return; + } + const promise = stream._writableStreamController[AbortSteps](abortRequest._reason); + uponPromise(promise, () => { + abortRequest._resolve(); + WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream); + }, (reason) => { + abortRequest._reject(reason); + WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream); + }); +} +function WritableStreamFinishInFlightWrite(stream) { + stream._inFlightWriteRequest._resolve(undefined); + stream._inFlightWriteRequest = undefined; +} +function WritableStreamFinishInFlightWriteWithError(stream, error) { + stream._inFlightWriteRequest._reject(error); + stream._inFlightWriteRequest = undefined; + WritableStreamDealWithRejection(stream, error); +} +function WritableStreamFinishInFlightClose(stream) { + stream._inFlightCloseRequest._resolve(undefined); + stream._inFlightCloseRequest = undefined; + const state = stream._state; + if (state === 'erroring') { + // The error was too late to do anything, so it is ignored. + stream._storedError = undefined; + if (stream._pendingAbortRequest !== undefined) { + stream._pendingAbortRequest._resolve(); + stream._pendingAbortRequest = undefined; + } + } + stream._state = 'closed'; + const writer = stream._writer; + if (writer !== undefined) { + defaultWriterClosedPromiseResolve(writer); + } +} +function WritableStreamFinishInFlightCloseWithError(stream, error) { + stream._inFlightCloseRequest._reject(error); + stream._inFlightCloseRequest = undefined; + // Never execute sink abort() after sink close(). + if (stream._pendingAbortRequest !== undefined) { + stream._pendingAbortRequest._reject(error); + stream._pendingAbortRequest = undefined; + } + WritableStreamDealWithRejection(stream, error); +} +// TODO(ricea): Fix alphabetical order. +function WritableStreamCloseQueuedOrInFlight(stream) { + if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) { + return false; + } + return true; +} +function WritableStreamHasOperationMarkedInFlight(stream) { + if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) { + return false; + } + return true; +} +function WritableStreamMarkCloseRequestInFlight(stream) { + stream._inFlightCloseRequest = stream._closeRequest; + stream._closeRequest = undefined; +} +function WritableStreamMarkFirstWriteRequestInFlight(stream) { + stream._inFlightWriteRequest = stream._writeRequests.shift(); +} +function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) { + if (stream._closeRequest !== undefined) { + stream._closeRequest._reject(stream._storedError); + stream._closeRequest = undefined; + } + const writer = stream._writer; + if (writer !== undefined) { + defaultWriterClosedPromiseReject(writer, stream._storedError); + } +} +function WritableStreamUpdateBackpressure(stream, backpressure) { + const writer = stream._writer; + if (writer !== undefined && backpressure !== stream._backpressure) { + if (backpressure) { + defaultWriterReadyPromiseReset(writer); + } + else { + defaultWriterReadyPromiseResolve(writer); + } + } + stream._backpressure = backpressure; +} +/** + * A default writer vended by a {@link WritableStream}. + * + * @public + */ +class WritableStreamDefaultWriter { + constructor(stream) { + assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter'); + assertWritableStream(stream, 'First parameter'); + if (IsWritableStreamLocked(stream)) { + throw new TypeError('This stream has already been locked for exclusive writing by another writer'); + } + this._ownerWritableStream = stream; + stream._writer = this; + const state = stream._state; + if (state === 'writable') { + if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) { + defaultWriterReadyPromiseInitialize(this); + } + else { + defaultWriterReadyPromiseInitializeAsResolved(this); + } + defaultWriterClosedPromiseInitialize(this); + } + else if (state === 'erroring') { + defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError); + defaultWriterClosedPromiseInitialize(this); + } + else if (state === 'closed') { + defaultWriterReadyPromiseInitializeAsResolved(this); + defaultWriterClosedPromiseInitializeAsResolved(this); + } + else { + const storedError = stream._storedError; + defaultWriterReadyPromiseInitializeAsRejected(this, storedError); + defaultWriterClosedPromiseInitializeAsRejected(this, storedError); + } + } + /** + * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or + * the writer’s lock is released before the stream finishes closing. + */ + get closed() { + if (!IsWritableStreamDefaultWriter(this)) { + return promiseRejectedWith(defaultWriterBrandCheckException('closed')); + } + return this._closedPromise; + } + /** + * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full. + * A producer can use this information to determine the right amount of data to write. + * + * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort + * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when + * the writer’s lock is released. + */ + get desiredSize() { + if (!IsWritableStreamDefaultWriter(this)) { + throw defaultWriterBrandCheckException('desiredSize'); + } + if (this._ownerWritableStream === undefined) { + throw defaultWriterLockException('desiredSize'); + } + return WritableStreamDefaultWriterGetDesiredSize(this); + } + /** + * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions + * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips + * back to zero or below, the getter will return a new promise that stays pending until the next transition. + * + * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become + * rejected. + */ + get ready() { + if (!IsWritableStreamDefaultWriter(this)) { + return promiseRejectedWith(defaultWriterBrandCheckException('ready')); + } + return this._readyPromise; + } + /** + * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}. + */ + abort(reason = undefined) { + if (!IsWritableStreamDefaultWriter(this)) { + return promiseRejectedWith(defaultWriterBrandCheckException('abort')); + } + if (this._ownerWritableStream === undefined) { + return promiseRejectedWith(defaultWriterLockException('abort')); + } + return WritableStreamDefaultWriterAbort(this, reason); + } + /** + * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}. + */ + close() { + if (!IsWritableStreamDefaultWriter(this)) { + return promiseRejectedWith(defaultWriterBrandCheckException('close')); + } + const stream = this._ownerWritableStream; + if (stream === undefined) { + return promiseRejectedWith(defaultWriterLockException('close')); + } + if (WritableStreamCloseQueuedOrInFlight(stream)) { + return promiseRejectedWith(new TypeError('Cannot close an already-closing stream')); + } + return WritableStreamDefaultWriterClose(this); + } + /** + * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active. + * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from + * now on; otherwise, the writer will appear closed. + * + * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the + * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled). + * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents + * other producers from writing in an interleaved manner. + */ + releaseLock() { + if (!IsWritableStreamDefaultWriter(this)) { + throw defaultWriterBrandCheckException('releaseLock'); + } + const stream = this._ownerWritableStream; + if (stream === undefined) { + return; + } + WritableStreamDefaultWriterRelease(this); + } + write(chunk = undefined) { + if (!IsWritableStreamDefaultWriter(this)) { + return promiseRejectedWith(defaultWriterBrandCheckException('write')); + } + if (this._ownerWritableStream === undefined) { + return promiseRejectedWith(defaultWriterLockException('write to')); + } + return WritableStreamDefaultWriterWrite(this, chunk); + } +} +Object.defineProperties(WritableStreamDefaultWriter.prototype, { + abort: { enumerable: true }, + close: { enumerable: true }, + releaseLock: { enumerable: true }, + write: { enumerable: true }, + closed: { enumerable: true }, + desiredSize: { enumerable: true }, + ready: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, { + value: 'WritableStreamDefaultWriter', + configurable: true + }); +} +// Abstract operations for the WritableStreamDefaultWriter. +function IsWritableStreamDefaultWriter(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) { + return false; + } + return x instanceof WritableStreamDefaultWriter; +} +// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check. +function WritableStreamDefaultWriterAbort(writer, reason) { + const stream = writer._ownerWritableStream; + return WritableStreamAbort(stream, reason); +} +function WritableStreamDefaultWriterClose(writer) { + const stream = writer._ownerWritableStream; + return WritableStreamClose(stream); +} +function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) { + const stream = writer._ownerWritableStream; + const state = stream._state; + if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') { + return promiseResolvedWith(undefined); + } + if (state === 'errored') { + return promiseRejectedWith(stream._storedError); + } + return WritableStreamDefaultWriterClose(writer); +} +function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) { + if (writer._closedPromiseState === 'pending') { + defaultWriterClosedPromiseReject(writer, error); + } + else { + defaultWriterClosedPromiseResetToRejected(writer, error); + } +} +function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) { + if (writer._readyPromiseState === 'pending') { + defaultWriterReadyPromiseReject(writer, error); + } + else { + defaultWriterReadyPromiseResetToRejected(writer, error); + } +} +function WritableStreamDefaultWriterGetDesiredSize(writer) { + const stream = writer._ownerWritableStream; + const state = stream._state; + if (state === 'errored' || state === 'erroring') { + return null; + } + if (state === 'closed') { + return 0; + } + return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController); +} +function WritableStreamDefaultWriterRelease(writer) { + const stream = writer._ownerWritableStream; + const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`); + WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError); + // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not + // rejected until afterwards. This means that simply testing state will not work. + WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError); + stream._writer = undefined; + writer._ownerWritableStream = undefined; +} +function WritableStreamDefaultWriterWrite(writer, chunk) { + const stream = writer._ownerWritableStream; + const controller = stream._writableStreamController; + const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk); + if (stream !== writer._ownerWritableStream) { + return promiseRejectedWith(defaultWriterLockException('write to')); + } + const state = stream._state; + if (state === 'errored') { + return promiseRejectedWith(stream._storedError); + } + if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') { + return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to')); + } + if (state === 'erroring') { + return promiseRejectedWith(stream._storedError); + } + const promise = WritableStreamAddWriteRequest(stream); + WritableStreamDefaultControllerWrite(controller, chunk, chunkSize); + return promise; +} +const closeSentinel = {}; +/** + * Allows control of a {@link WritableStream | writable stream}'s state and internal queue. + * + * @public + */ +class WritableStreamDefaultController { + constructor() { + throw new TypeError('Illegal constructor'); + } + /** + * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted. + * + * @deprecated + * This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177. + * Use {@link WritableStreamDefaultController.signal}'s `reason` instead. + */ + get abortReason() { + if (!IsWritableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$2('abortReason'); + } + return this._abortReason; + } + /** + * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted. + */ + get signal() { + if (!IsWritableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$2('signal'); + } + if (this._abortController === undefined) { + // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`. + // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill, + // so instead we only implement support for `signal` if we find a global `AbortController` constructor. + throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported'); + } + return this._abortController.signal; + } + /** + * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`. + * + * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying + * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the + * normal lifecycle of interactions with the underlying sink. + */ + error(e = undefined) { + if (!IsWritableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$2('error'); + } + const state = this._controlledWritableStream._state; + if (state !== 'writable') { + // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so + // just treat it as a no-op. + return; + } + WritableStreamDefaultControllerError(this, e); + } + /** @internal */ + [AbortSteps](reason) { + const result = this._abortAlgorithm(reason); + WritableStreamDefaultControllerClearAlgorithms(this); + return result; + } + /** @internal */ + [ErrorSteps]() { + ResetQueue(this); + } +} +Object.defineProperties(WritableStreamDefaultController.prototype, { + abortReason: { enumerable: true }, + signal: { enumerable: true }, + error: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, { + value: 'WritableStreamDefaultController', + configurable: true + }); +} +// Abstract operations implementing interface required by the WritableStream. +function IsWritableStreamDefaultController(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) { + return false; + } + return x instanceof WritableStreamDefaultController; +} +function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) { + controller._controlledWritableStream = stream; + stream._writableStreamController = controller; + // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly. + controller._queue = undefined; + controller._queueTotalSize = undefined; + ResetQueue(controller); + controller._abortReason = undefined; + controller._abortController = createAbortController(); + controller._started = false; + controller._strategySizeAlgorithm = sizeAlgorithm; + controller._strategyHWM = highWaterMark; + controller._writeAlgorithm = writeAlgorithm; + controller._closeAlgorithm = closeAlgorithm; + controller._abortAlgorithm = abortAlgorithm; + const backpressure = WritableStreamDefaultControllerGetBackpressure(controller); + WritableStreamUpdateBackpressure(stream, backpressure); + const startResult = startAlgorithm(); + const startPromise = promiseResolvedWith(startResult); + uponPromise(startPromise, () => { + controller._started = true; + WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller); + }, r => { + controller._started = true; + WritableStreamDealWithRejection(stream, r); + }); +} +function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) { + const controller = Object.create(WritableStreamDefaultController.prototype); + let startAlgorithm = () => undefined; + let writeAlgorithm = () => promiseResolvedWith(undefined); + let closeAlgorithm = () => promiseResolvedWith(undefined); + let abortAlgorithm = () => promiseResolvedWith(undefined); + if (underlyingSink.start !== undefined) { + startAlgorithm = () => underlyingSink.start(controller); + } + if (underlyingSink.write !== undefined) { + writeAlgorithm = chunk => underlyingSink.write(chunk, controller); + } + if (underlyingSink.close !== undefined) { + closeAlgorithm = () => underlyingSink.close(); + } + if (underlyingSink.abort !== undefined) { + abortAlgorithm = reason => underlyingSink.abort(reason); + } + SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm); +} +// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls. +function WritableStreamDefaultControllerClearAlgorithms(controller) { + controller._writeAlgorithm = undefined; + controller._closeAlgorithm = undefined; + controller._abortAlgorithm = undefined; + controller._strategySizeAlgorithm = undefined; +} +function WritableStreamDefaultControllerClose(controller) { + EnqueueValueWithSize(controller, closeSentinel, 0); + WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller); +} +function WritableStreamDefaultControllerGetChunkSize(controller, chunk) { + try { + return controller._strategySizeAlgorithm(chunk); + } + catch (chunkSizeE) { + WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE); + return 1; + } +} +function WritableStreamDefaultControllerGetDesiredSize(controller) { + return controller._strategyHWM - controller._queueTotalSize; +} +function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) { + try { + EnqueueValueWithSize(controller, chunk, chunkSize); + } + catch (enqueueE) { + WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE); + return; + } + const stream = controller._controlledWritableStream; + if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') { + const backpressure = WritableStreamDefaultControllerGetBackpressure(controller); + WritableStreamUpdateBackpressure(stream, backpressure); + } + WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller); +} +// Abstract operations for the WritableStreamDefaultController. +function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) { + const stream = controller._controlledWritableStream; + if (!controller._started) { + return; + } + if (stream._inFlightWriteRequest !== undefined) { + return; + } + const state = stream._state; + if (state === 'erroring') { + WritableStreamFinishErroring(stream); + return; + } + if (controller._queue.length === 0) { + return; + } + const value = PeekQueueValue(controller); + if (value === closeSentinel) { + WritableStreamDefaultControllerProcessClose(controller); + } + else { + WritableStreamDefaultControllerProcessWrite(controller, value); + } +} +function WritableStreamDefaultControllerErrorIfNeeded(controller, error) { + if (controller._controlledWritableStream._state === 'writable') { + WritableStreamDefaultControllerError(controller, error); + } +} +function WritableStreamDefaultControllerProcessClose(controller) { + const stream = controller._controlledWritableStream; + WritableStreamMarkCloseRequestInFlight(stream); + DequeueValue(controller); + const sinkClosePromise = controller._closeAlgorithm(); + WritableStreamDefaultControllerClearAlgorithms(controller); + uponPromise(sinkClosePromise, () => { + WritableStreamFinishInFlightClose(stream); + }, reason => { + WritableStreamFinishInFlightCloseWithError(stream, reason); + }); +} +function WritableStreamDefaultControllerProcessWrite(controller, chunk) { + const stream = controller._controlledWritableStream; + WritableStreamMarkFirstWriteRequestInFlight(stream); + const sinkWritePromise = controller._writeAlgorithm(chunk); + uponPromise(sinkWritePromise, () => { + WritableStreamFinishInFlightWrite(stream); + const state = stream._state; + DequeueValue(controller); + if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') { + const backpressure = WritableStreamDefaultControllerGetBackpressure(controller); + WritableStreamUpdateBackpressure(stream, backpressure); + } + WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller); + }, reason => { + if (stream._state === 'writable') { + WritableStreamDefaultControllerClearAlgorithms(controller); + } + WritableStreamFinishInFlightWriteWithError(stream, reason); + }); +} +function WritableStreamDefaultControllerGetBackpressure(controller) { + const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller); + return desiredSize <= 0; +} +// A client of WritableStreamDefaultController may use these functions directly to bypass state check. +function WritableStreamDefaultControllerError(controller, error) { + const stream = controller._controlledWritableStream; + WritableStreamDefaultControllerClearAlgorithms(controller); + WritableStreamStartErroring(stream, error); +} +// Helper functions for the WritableStream. +function streamBrandCheckException$2(name) { + return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`); +} +// Helper functions for the WritableStreamDefaultController. +function defaultControllerBrandCheckException$2(name) { + return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`); +} +// Helper functions for the WritableStreamDefaultWriter. +function defaultWriterBrandCheckException(name) { + return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`); +} +function defaultWriterLockException(name) { + return new TypeError('Cannot ' + name + ' a stream using a released writer'); +} +function defaultWriterClosedPromiseInitialize(writer) { + writer._closedPromise = newPromise((resolve, reject) => { + writer._closedPromise_resolve = resolve; + writer._closedPromise_reject = reject; + writer._closedPromiseState = 'pending'; + }); +} +function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) { + defaultWriterClosedPromiseInitialize(writer); + defaultWriterClosedPromiseReject(writer, reason); +} +function defaultWriterClosedPromiseInitializeAsResolved(writer) { + defaultWriterClosedPromiseInitialize(writer); + defaultWriterClosedPromiseResolve(writer); +} +function defaultWriterClosedPromiseReject(writer, reason) { + if (writer._closedPromise_reject === undefined) { + return; + } + setPromiseIsHandledToTrue(writer._closedPromise); + writer._closedPromise_reject(reason); + writer._closedPromise_resolve = undefined; + writer._closedPromise_reject = undefined; + writer._closedPromiseState = 'rejected'; +} +function defaultWriterClosedPromiseResetToRejected(writer, reason) { + defaultWriterClosedPromiseInitializeAsRejected(writer, reason); +} +function defaultWriterClosedPromiseResolve(writer) { + if (writer._closedPromise_resolve === undefined) { + return; + } + writer._closedPromise_resolve(undefined); + writer._closedPromise_resolve = undefined; + writer._closedPromise_reject = undefined; + writer._closedPromiseState = 'resolved'; +} +function defaultWriterReadyPromiseInitialize(writer) { + writer._readyPromise = newPromise((resolve, reject) => { + writer._readyPromise_resolve = resolve; + writer._readyPromise_reject = reject; + }); + writer._readyPromiseState = 'pending'; +} +function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) { + defaultWriterReadyPromiseInitialize(writer); + defaultWriterReadyPromiseReject(writer, reason); +} +function defaultWriterReadyPromiseInitializeAsResolved(writer) { + defaultWriterReadyPromiseInitialize(writer); + defaultWriterReadyPromiseResolve(writer); +} +function defaultWriterReadyPromiseReject(writer, reason) { + if (writer._readyPromise_reject === undefined) { + return; + } + setPromiseIsHandledToTrue(writer._readyPromise); + writer._readyPromise_reject(reason); + writer._readyPromise_resolve = undefined; + writer._readyPromise_reject = undefined; + writer._readyPromiseState = 'rejected'; +} +function defaultWriterReadyPromiseReset(writer) { + defaultWriterReadyPromiseInitialize(writer); +} +function defaultWriterReadyPromiseResetToRejected(writer, reason) { + defaultWriterReadyPromiseInitializeAsRejected(writer, reason); +} +function defaultWriterReadyPromiseResolve(writer) { + if (writer._readyPromise_resolve === undefined) { + return; + } + writer._readyPromise_resolve(undefined); + writer._readyPromise_resolve = undefined; + writer._readyPromise_reject = undefined; + writer._readyPromiseState = 'fulfilled'; +} + +/// +const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined; + +/// +function isDOMExceptionConstructor(ctor) { + if (!(typeof ctor === 'function' || typeof ctor === 'object')) { + return false; + } + try { + new ctor(); + return true; + } + catch (_a) { + return false; + } +} +function createDOMExceptionPolyfill() { + // eslint-disable-next-line no-shadow + const ctor = function DOMException(message, name) { + this.message = message || ''; + this.name = name || 'Error'; + if (Error.captureStackTrace) { + Error.captureStackTrace(this, this.constructor); + } + }; + ctor.prototype = Object.create(Error.prototype); + Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true }); + return ctor; +} +// eslint-disable-next-line no-redeclare +const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill(); + +function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) { + const reader = AcquireReadableStreamDefaultReader(source); + const writer = AcquireWritableStreamDefaultWriter(dest); + source._disturbed = true; + let shuttingDown = false; + // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown. + let currentWrite = promiseResolvedWith(undefined); + return newPromise((resolve, reject) => { + let abortAlgorithm; + if (signal !== undefined) { + abortAlgorithm = () => { + const error = new DOMException$1('Aborted', 'AbortError'); + const actions = []; + if (!preventAbort) { + actions.push(() => { + if (dest._state === 'writable') { + return WritableStreamAbort(dest, error); + } + return promiseResolvedWith(undefined); + }); + } + if (!preventCancel) { + actions.push(() => { + if (source._state === 'readable') { + return ReadableStreamCancel(source, error); + } + return promiseResolvedWith(undefined); + }); + } + shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error); + }; + if (signal.aborted) { + abortAlgorithm(); + return; + } + signal.addEventListener('abort', abortAlgorithm); + } + // Using reader and writer, read all chunks from this and write them to dest + // - Backpressure must be enforced + // - Shutdown must stop all activity + function pipeLoop() { + return newPromise((resolveLoop, rejectLoop) => { + function next(done) { + if (done) { + resolveLoop(); + } + else { + // Use `PerformPromiseThen` instead of `uponPromise` to avoid + // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers + PerformPromiseThen(pipeStep(), next, rejectLoop); + } + } + next(false); + }); + } + function pipeStep() { + if (shuttingDown) { + return promiseResolvedWith(true); + } + return PerformPromiseThen(writer._readyPromise, () => { + return newPromise((resolveRead, rejectRead) => { + ReadableStreamDefaultReaderRead(reader, { + _chunkSteps: chunk => { + currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop); + resolveRead(false); + }, + _closeSteps: () => resolveRead(true), + _errorSteps: rejectRead + }); + }); + }); + } + // Errors must be propagated forward + isOrBecomesErrored(source, reader._closedPromise, storedError => { + if (!preventAbort) { + shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError); + } + else { + shutdown(true, storedError); + } + }); + // Errors must be propagated backward + isOrBecomesErrored(dest, writer._closedPromise, storedError => { + if (!preventCancel) { + shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError); + } + else { + shutdown(true, storedError); + } + }); + // Closing must be propagated forward + isOrBecomesClosed(source, reader._closedPromise, () => { + if (!preventClose) { + shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer)); + } + else { + shutdown(); + } + }); + // Closing must be propagated backward + if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') { + const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it'); + if (!preventCancel) { + shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed); + } + else { + shutdown(true, destClosed); + } + } + setPromiseIsHandledToTrue(pipeLoop()); + function waitForWritesToFinish() { + // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait + // for that too. + const oldCurrentWrite = currentWrite; + return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined); + } + function isOrBecomesErrored(stream, promise, action) { + if (stream._state === 'errored') { + action(stream._storedError); + } + else { + uponRejection(promise, action); + } + } + function isOrBecomesClosed(stream, promise, action) { + if (stream._state === 'closed') { + action(); + } + else { + uponFulfillment(promise, action); + } + } + function shutdownWithAction(action, originalIsError, originalError) { + if (shuttingDown) { + return; + } + shuttingDown = true; + if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) { + uponFulfillment(waitForWritesToFinish(), doTheRest); + } + else { + doTheRest(); + } + function doTheRest() { + uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError)); + } + } + function shutdown(isError, error) { + if (shuttingDown) { + return; + } + shuttingDown = true; + if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) { + uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error)); + } + else { + finalize(isError, error); + } + } + function finalize(isError, error) { + WritableStreamDefaultWriterRelease(writer); + ReadableStreamReaderGenericRelease(reader); + if (signal !== undefined) { + signal.removeEventListener('abort', abortAlgorithm); + } + if (isError) { + reject(error); + } + else { + resolve(undefined); + } + } + }); +} + +/** + * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue. + * + * @public + */ +class ReadableStreamDefaultController { + constructor() { + throw new TypeError('Illegal constructor'); + } + /** + * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is + * over-full. An underlying source ought to use this information to determine when and how to apply backpressure. + */ + get desiredSize() { + if (!IsReadableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$1('desiredSize'); + } + return ReadableStreamDefaultControllerGetDesiredSize(this); + } + /** + * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from + * the stream, but once those are read, the stream will become closed. + */ + close() { + if (!IsReadableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$1('close'); + } + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) { + throw new TypeError('The stream is not in a state that permits close'); + } + ReadableStreamDefaultControllerClose(this); + } + enqueue(chunk = undefined) { + if (!IsReadableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$1('enqueue'); + } + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) { + throw new TypeError('The stream is not in a state that permits enqueue'); + } + return ReadableStreamDefaultControllerEnqueue(this, chunk); + } + /** + * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`. + */ + error(e = undefined) { + if (!IsReadableStreamDefaultController(this)) { + throw defaultControllerBrandCheckException$1('error'); + } + ReadableStreamDefaultControllerError(this, e); + } + /** @internal */ + [CancelSteps](reason) { + ResetQueue(this); + const result = this._cancelAlgorithm(reason); + ReadableStreamDefaultControllerClearAlgorithms(this); + return result; + } + /** @internal */ + [PullSteps](readRequest) { + const stream = this._controlledReadableStream; + if (this._queue.length > 0) { + const chunk = DequeueValue(this); + if (this._closeRequested && this._queue.length === 0) { + ReadableStreamDefaultControllerClearAlgorithms(this); + ReadableStreamClose(stream); + } + else { + ReadableStreamDefaultControllerCallPullIfNeeded(this); + } + readRequest._chunkSteps(chunk); + } + else { + ReadableStreamAddReadRequest(stream, readRequest); + ReadableStreamDefaultControllerCallPullIfNeeded(this); + } + } +} +Object.defineProperties(ReadableStreamDefaultController.prototype, { + close: { enumerable: true }, + enqueue: { enumerable: true }, + error: { enumerable: true }, + desiredSize: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableStreamDefaultController', + configurable: true + }); +} +// Abstract operations for the ReadableStreamDefaultController. +function IsReadableStreamDefaultController(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) { + return false; + } + return x instanceof ReadableStreamDefaultController; +} +function ReadableStreamDefaultControllerCallPullIfNeeded(controller) { + const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller); + if (!shouldPull) { + return; + } + if (controller._pulling) { + controller._pullAgain = true; + return; + } + controller._pulling = true; + const pullPromise = controller._pullAlgorithm(); + uponPromise(pullPromise, () => { + controller._pulling = false; + if (controller._pullAgain) { + controller._pullAgain = false; + ReadableStreamDefaultControllerCallPullIfNeeded(controller); + } + }, e => { + ReadableStreamDefaultControllerError(controller, e); + }); +} +function ReadableStreamDefaultControllerShouldCallPull(controller) { + const stream = controller._controlledReadableStream; + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) { + return false; + } + if (!controller._started) { + return false; + } + if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) { + return true; + } + const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller); + if (desiredSize > 0) { + return true; + } + return false; +} +function ReadableStreamDefaultControllerClearAlgorithms(controller) { + controller._pullAlgorithm = undefined; + controller._cancelAlgorithm = undefined; + controller._strategySizeAlgorithm = undefined; +} +// A client of ReadableStreamDefaultController may use these functions directly to bypass state check. +function ReadableStreamDefaultControllerClose(controller) { + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) { + return; + } + const stream = controller._controlledReadableStream; + controller._closeRequested = true; + if (controller._queue.length === 0) { + ReadableStreamDefaultControllerClearAlgorithms(controller); + ReadableStreamClose(stream); + } +} +function ReadableStreamDefaultControllerEnqueue(controller, chunk) { + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) { + return; + } + const stream = controller._controlledReadableStream; + if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) { + ReadableStreamFulfillReadRequest(stream, chunk, false); + } + else { + let chunkSize; + try { + chunkSize = controller._strategySizeAlgorithm(chunk); + } + catch (chunkSizeE) { + ReadableStreamDefaultControllerError(controller, chunkSizeE); + throw chunkSizeE; + } + try { + EnqueueValueWithSize(controller, chunk, chunkSize); + } + catch (enqueueE) { + ReadableStreamDefaultControllerError(controller, enqueueE); + throw enqueueE; + } + } + ReadableStreamDefaultControllerCallPullIfNeeded(controller); +} +function ReadableStreamDefaultControllerError(controller, e) { + const stream = controller._controlledReadableStream; + if (stream._state !== 'readable') { + return; + } + ResetQueue(controller); + ReadableStreamDefaultControllerClearAlgorithms(controller); + ReadableStreamError(stream, e); +} +function ReadableStreamDefaultControllerGetDesiredSize(controller) { + const state = controller._controlledReadableStream._state; + if (state === 'errored') { + return null; + } + if (state === 'closed') { + return 0; + } + return controller._strategyHWM - controller._queueTotalSize; +} +// This is used in the implementation of TransformStream. +function ReadableStreamDefaultControllerHasBackpressure(controller) { + if (ReadableStreamDefaultControllerShouldCallPull(controller)) { + return false; + } + return true; +} +function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) { + const state = controller._controlledReadableStream._state; + if (!controller._closeRequested && state === 'readable') { + return true; + } + return false; +} +function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) { + controller._controlledReadableStream = stream; + controller._queue = undefined; + controller._queueTotalSize = undefined; + ResetQueue(controller); + controller._started = false; + controller._closeRequested = false; + controller._pullAgain = false; + controller._pulling = false; + controller._strategySizeAlgorithm = sizeAlgorithm; + controller._strategyHWM = highWaterMark; + controller._pullAlgorithm = pullAlgorithm; + controller._cancelAlgorithm = cancelAlgorithm; + stream._readableStreamController = controller; + const startResult = startAlgorithm(); + uponPromise(promiseResolvedWith(startResult), () => { + controller._started = true; + ReadableStreamDefaultControllerCallPullIfNeeded(controller); + }, r => { + ReadableStreamDefaultControllerError(controller, r); + }); +} +function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) { + const controller = Object.create(ReadableStreamDefaultController.prototype); + let startAlgorithm = () => undefined; + let pullAlgorithm = () => promiseResolvedWith(undefined); + let cancelAlgorithm = () => promiseResolvedWith(undefined); + if (underlyingSource.start !== undefined) { + startAlgorithm = () => underlyingSource.start(controller); + } + if (underlyingSource.pull !== undefined) { + pullAlgorithm = () => underlyingSource.pull(controller); + } + if (underlyingSource.cancel !== undefined) { + cancelAlgorithm = reason => underlyingSource.cancel(reason); + } + SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm); +} +// Helper functions for the ReadableStreamDefaultController. +function defaultControllerBrandCheckException$1(name) { + return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`); +} + +function ReadableStreamTee(stream, cloneForBranch2) { + if (IsReadableByteStreamController(stream._readableStreamController)) { + return ReadableByteStreamTee(stream); + } + return ReadableStreamDefaultTee(stream); +} +function ReadableStreamDefaultTee(stream, cloneForBranch2) { + const reader = AcquireReadableStreamDefaultReader(stream); + let reading = false; + let readAgain = false; + let canceled1 = false; + let canceled2 = false; + let reason1; + let reason2; + let branch1; + let branch2; + let resolveCancelPromise; + const cancelPromise = newPromise(resolve => { + resolveCancelPromise = resolve; + }); + function pullAlgorithm() { + if (reading) { + readAgain = true; + return promiseResolvedWith(undefined); + } + reading = true; + const readRequest = { + _chunkSteps: chunk => { + // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using + // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let + // successful synchronously-available reads get ahead of asynchronously-available errors. + queueMicrotask(() => { + readAgain = false; + const chunk1 = chunk; + const chunk2 = chunk; + // There is no way to access the cloning code right now in the reference implementation. + // If we add one then we'll need an implementation for serializable objects. + // if (!canceled2 && cloneForBranch2) { + // chunk2 = StructuredDeserialize(StructuredSerialize(chunk2)); + // } + if (!canceled1) { + ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1); + } + if (!canceled2) { + ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2); + } + reading = false; + if (readAgain) { + pullAlgorithm(); + } + }); + }, + _closeSteps: () => { + reading = false; + if (!canceled1) { + ReadableStreamDefaultControllerClose(branch1._readableStreamController); + } + if (!canceled2) { + ReadableStreamDefaultControllerClose(branch2._readableStreamController); + } + if (!canceled1 || !canceled2) { + resolveCancelPromise(undefined); + } + }, + _errorSteps: () => { + reading = false; + } + }; + ReadableStreamDefaultReaderRead(reader, readRequest); + return promiseResolvedWith(undefined); + } + function cancel1Algorithm(reason) { + canceled1 = true; + reason1 = reason; + if (canceled2) { + const compositeReason = CreateArrayFromList([reason1, reason2]); + const cancelResult = ReadableStreamCancel(stream, compositeReason); + resolveCancelPromise(cancelResult); + } + return cancelPromise; + } + function cancel2Algorithm(reason) { + canceled2 = true; + reason2 = reason; + if (canceled1) { + const compositeReason = CreateArrayFromList([reason1, reason2]); + const cancelResult = ReadableStreamCancel(stream, compositeReason); + resolveCancelPromise(cancelResult); + } + return cancelPromise; + } + function startAlgorithm() { + // do nothing + } + branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm); + branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm); + uponRejection(reader._closedPromise, (r) => { + ReadableStreamDefaultControllerError(branch1._readableStreamController, r); + ReadableStreamDefaultControllerError(branch2._readableStreamController, r); + if (!canceled1 || !canceled2) { + resolveCancelPromise(undefined); + } + }); + return [branch1, branch2]; +} +function ReadableByteStreamTee(stream) { + let reader = AcquireReadableStreamDefaultReader(stream); + let reading = false; + let readAgainForBranch1 = false; + let readAgainForBranch2 = false; + let canceled1 = false; + let canceled2 = false; + let reason1; + let reason2; + let branch1; + let branch2; + let resolveCancelPromise; + const cancelPromise = newPromise(resolve => { + resolveCancelPromise = resolve; + }); + function forwardReaderError(thisReader) { + uponRejection(thisReader._closedPromise, r => { + if (thisReader !== reader) { + return; + } + ReadableByteStreamControllerError(branch1._readableStreamController, r); + ReadableByteStreamControllerError(branch2._readableStreamController, r); + if (!canceled1 || !canceled2) { + resolveCancelPromise(undefined); + } + }); + } + function pullWithDefaultReader() { + if (IsReadableStreamBYOBReader(reader)) { + ReadableStreamReaderGenericRelease(reader); + reader = AcquireReadableStreamDefaultReader(stream); + forwardReaderError(reader); + } + const readRequest = { + _chunkSteps: chunk => { + // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using + // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let + // successful synchronously-available reads get ahead of asynchronously-available errors. + queueMicrotask(() => { + readAgainForBranch1 = false; + readAgainForBranch2 = false; + const chunk1 = chunk; + let chunk2 = chunk; + if (!canceled1 && !canceled2) { + try { + chunk2 = CloneAsUint8Array(chunk); + } + catch (cloneE) { + ReadableByteStreamControllerError(branch1._readableStreamController, cloneE); + ReadableByteStreamControllerError(branch2._readableStreamController, cloneE); + resolveCancelPromise(ReadableStreamCancel(stream, cloneE)); + return; + } + } + if (!canceled1) { + ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1); + } + if (!canceled2) { + ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2); + } + reading = false; + if (readAgainForBranch1) { + pull1Algorithm(); + } + else if (readAgainForBranch2) { + pull2Algorithm(); + } + }); + }, + _closeSteps: () => { + reading = false; + if (!canceled1) { + ReadableByteStreamControllerClose(branch1._readableStreamController); + } + if (!canceled2) { + ReadableByteStreamControllerClose(branch2._readableStreamController); + } + if (branch1._readableStreamController._pendingPullIntos.length > 0) { + ReadableByteStreamControllerRespond(branch1._readableStreamController, 0); + } + if (branch2._readableStreamController._pendingPullIntos.length > 0) { + ReadableByteStreamControllerRespond(branch2._readableStreamController, 0); + } + if (!canceled1 || !canceled2) { + resolveCancelPromise(undefined); + } + }, + _errorSteps: () => { + reading = false; + } + }; + ReadableStreamDefaultReaderRead(reader, readRequest); + } + function pullWithBYOBReader(view, forBranch2) { + if (IsReadableStreamDefaultReader(reader)) { + ReadableStreamReaderGenericRelease(reader); + reader = AcquireReadableStreamBYOBReader(stream); + forwardReaderError(reader); + } + const byobBranch = forBranch2 ? branch2 : branch1; + const otherBranch = forBranch2 ? branch1 : branch2; + const readIntoRequest = { + _chunkSteps: chunk => { + // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using + // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let + // successful synchronously-available reads get ahead of asynchronously-available errors. + queueMicrotask(() => { + readAgainForBranch1 = false; + readAgainForBranch2 = false; + const byobCanceled = forBranch2 ? canceled2 : canceled1; + const otherCanceled = forBranch2 ? canceled1 : canceled2; + if (!otherCanceled) { + let clonedChunk; + try { + clonedChunk = CloneAsUint8Array(chunk); + } + catch (cloneE) { + ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE); + ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE); + resolveCancelPromise(ReadableStreamCancel(stream, cloneE)); + return; + } + if (!byobCanceled) { + ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk); + } + ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk); + } + else if (!byobCanceled) { + ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk); + } + reading = false; + if (readAgainForBranch1) { + pull1Algorithm(); + } + else if (readAgainForBranch2) { + pull2Algorithm(); + } + }); + }, + _closeSteps: chunk => { + reading = false; + const byobCanceled = forBranch2 ? canceled2 : canceled1; + const otherCanceled = forBranch2 ? canceled1 : canceled2; + if (!byobCanceled) { + ReadableByteStreamControllerClose(byobBranch._readableStreamController); + } + if (!otherCanceled) { + ReadableByteStreamControllerClose(otherBranch._readableStreamController); + } + if (chunk !== undefined) { + if (!byobCanceled) { + ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk); + } + if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) { + ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0); + } + } + if (!byobCanceled || !otherCanceled) { + resolveCancelPromise(undefined); + } + }, + _errorSteps: () => { + reading = false; + } + }; + ReadableStreamBYOBReaderRead(reader, view, readIntoRequest); + } + function pull1Algorithm() { + if (reading) { + readAgainForBranch1 = true; + return promiseResolvedWith(undefined); + } + reading = true; + const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController); + if (byobRequest === null) { + pullWithDefaultReader(); + } + else { + pullWithBYOBReader(byobRequest._view, false); + } + return promiseResolvedWith(undefined); + } + function pull2Algorithm() { + if (reading) { + readAgainForBranch2 = true; + return promiseResolvedWith(undefined); + } + reading = true; + const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController); + if (byobRequest === null) { + pullWithDefaultReader(); + } + else { + pullWithBYOBReader(byobRequest._view, true); + } + return promiseResolvedWith(undefined); + } + function cancel1Algorithm(reason) { + canceled1 = true; + reason1 = reason; + if (canceled2) { + const compositeReason = CreateArrayFromList([reason1, reason2]); + const cancelResult = ReadableStreamCancel(stream, compositeReason); + resolveCancelPromise(cancelResult); + } + return cancelPromise; + } + function cancel2Algorithm(reason) { + canceled2 = true; + reason2 = reason; + if (canceled1) { + const compositeReason = CreateArrayFromList([reason1, reason2]); + const cancelResult = ReadableStreamCancel(stream, compositeReason); + resolveCancelPromise(cancelResult); + } + return cancelPromise; + } + function startAlgorithm() { + return; + } + branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm); + branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm); + forwardReaderError(reader); + return [branch1, branch2]; +} + +function convertUnderlyingDefaultOrByteSource(source, context) { + assertDictionary(source, context); + const original = source; + const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize; + const cancel = original === null || original === void 0 ? void 0 : original.cancel; + const pull = original === null || original === void 0 ? void 0 : original.pull; + const start = original === null || original === void 0 ? void 0 : original.start; + const type = original === null || original === void 0 ? void 0 : original.type; + return { + autoAllocateChunkSize: autoAllocateChunkSize === undefined ? + undefined : + convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`), + cancel: cancel === undefined ? + undefined : + convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`), + pull: pull === undefined ? + undefined : + convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`), + start: start === undefined ? + undefined : + convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`), + type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`) + }; +} +function convertUnderlyingSourceCancelCallback(fn, original, context) { + assertFunction(fn, context); + return (reason) => promiseCall(fn, original, [reason]); +} +function convertUnderlyingSourcePullCallback(fn, original, context) { + assertFunction(fn, context); + return (controller) => promiseCall(fn, original, [controller]); +} +function convertUnderlyingSourceStartCallback(fn, original, context) { + assertFunction(fn, context); + return (controller) => reflectCall(fn, original, [controller]); +} +function convertReadableStreamType(type, context) { + type = `${type}`; + if (type !== 'bytes') { + throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`); + } + return type; +} + +function convertReaderOptions(options, context) { + assertDictionary(options, context); + const mode = options === null || options === void 0 ? void 0 : options.mode; + return { + mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`) + }; +} +function convertReadableStreamReaderMode(mode, context) { + mode = `${mode}`; + if (mode !== 'byob') { + throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`); + } + return mode; +} + +function convertIteratorOptions(options, context) { + assertDictionary(options, context); + const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel; + return { preventCancel: Boolean(preventCancel) }; +} + +function convertPipeOptions(options, context) { + assertDictionary(options, context); + const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort; + const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel; + const preventClose = options === null || options === void 0 ? void 0 : options.preventClose; + const signal = options === null || options === void 0 ? void 0 : options.signal; + if (signal !== undefined) { + assertAbortSignal(signal, `${context} has member 'signal' that`); + } + return { + preventAbort: Boolean(preventAbort), + preventCancel: Boolean(preventCancel), + preventClose: Boolean(preventClose), + signal + }; +} +function assertAbortSignal(signal, context) { + if (!isAbortSignal(signal)) { + throw new TypeError(`${context} is not an AbortSignal.`); + } +} + +function convertReadableWritablePair(pair, context) { + assertDictionary(pair, context); + const readable = pair === null || pair === void 0 ? void 0 : pair.readable; + assertRequiredField(readable, 'readable', 'ReadableWritablePair'); + assertReadableStream(readable, `${context} has member 'readable' that`); + const writable = pair === null || pair === void 0 ? void 0 : pair.writable; + assertRequiredField(writable, 'writable', 'ReadableWritablePair'); + assertWritableStream(writable, `${context} has member 'writable' that`); + return { readable, writable }; +} + +/** + * A readable stream represents a source of data, from which you can read. + * + * @public + */ +class ReadableStream { + constructor(rawUnderlyingSource = {}, rawStrategy = {}) { + if (rawUnderlyingSource === undefined) { + rawUnderlyingSource = null; + } + else { + assertObject(rawUnderlyingSource, 'First parameter'); + } + const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter'); + const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter'); + InitializeReadableStream(this); + if (underlyingSource.type === 'bytes') { + if (strategy.size !== undefined) { + throw new RangeError('The strategy for a byte stream cannot have a size function'); + } + const highWaterMark = ExtractHighWaterMark(strategy, 0); + SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark); + } + else { + const sizeAlgorithm = ExtractSizeAlgorithm(strategy); + const highWaterMark = ExtractHighWaterMark(strategy, 1); + SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm); + } + } + /** + * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}. + */ + get locked() { + if (!IsReadableStream(this)) { + throw streamBrandCheckException$1('locked'); + } + return IsReadableStreamLocked(this); + } + /** + * Cancels the stream, signaling a loss of interest in the stream by a consumer. + * + * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()} + * method, which might or might not use it. + */ + cancel(reason = undefined) { + if (!IsReadableStream(this)) { + return promiseRejectedWith(streamBrandCheckException$1('cancel')); + } + if (IsReadableStreamLocked(this)) { + return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader')); + } + return ReadableStreamCancel(this, reason); + } + getReader(rawOptions = undefined) { + if (!IsReadableStream(this)) { + throw streamBrandCheckException$1('getReader'); + } + const options = convertReaderOptions(rawOptions, 'First parameter'); + if (options.mode === undefined) { + return AcquireReadableStreamDefaultReader(this); + } + return AcquireReadableStreamBYOBReader(this); + } + pipeThrough(rawTransform, rawOptions = {}) { + if (!IsReadableStream(this)) { + throw streamBrandCheckException$1('pipeThrough'); + } + assertRequiredArgument(rawTransform, 1, 'pipeThrough'); + const transform = convertReadableWritablePair(rawTransform, 'First parameter'); + const options = convertPipeOptions(rawOptions, 'Second parameter'); + if (IsReadableStreamLocked(this)) { + throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream'); + } + if (IsWritableStreamLocked(transform.writable)) { + throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream'); + } + const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal); + setPromiseIsHandledToTrue(promise); + return transform.readable; + } + pipeTo(destination, rawOptions = {}) { + if (!IsReadableStream(this)) { + return promiseRejectedWith(streamBrandCheckException$1('pipeTo')); + } + if (destination === undefined) { + return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`); + } + if (!IsWritableStream(destination)) { + return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)); + } + let options; + try { + options = convertPipeOptions(rawOptions, 'Second parameter'); + } + catch (e) { + return promiseRejectedWith(e); + } + if (IsReadableStreamLocked(this)) { + return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')); + } + if (IsWritableStreamLocked(destination)) { + return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')); + } + return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal); + } + /** + * Tees this readable stream, returning a two-element array containing the two resulting branches as + * new {@link ReadableStream} instances. + * + * Teeing a stream will lock it, preventing any other consumer from acquiring a reader. + * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be + * propagated to the stream's underlying source. + * + * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable, + * this could allow interference between the two branches. + */ + tee() { + if (!IsReadableStream(this)) { + throw streamBrandCheckException$1('tee'); + } + const branches = ReadableStreamTee(this); + return CreateArrayFromList(branches); + } + values(rawOptions = undefined) { + if (!IsReadableStream(this)) { + throw streamBrandCheckException$1('values'); + } + const options = convertIteratorOptions(rawOptions, 'First parameter'); + return AcquireReadableStreamAsyncIterator(this, options.preventCancel); + } +} +Object.defineProperties(ReadableStream.prototype, { + cancel: { enumerable: true }, + getReader: { enumerable: true }, + pipeThrough: { enumerable: true }, + pipeTo: { enumerable: true }, + tee: { enumerable: true }, + values: { enumerable: true }, + locked: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, { + value: 'ReadableStream', + configurable: true + }); +} +if (typeof SymbolPolyfill.asyncIterator === 'symbol') { + Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, { + value: ReadableStream.prototype.values, + writable: true, + configurable: true + }); +} +// Abstract operations for the ReadableStream. +// Throws if and only if startAlgorithm throws. +function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) { + const stream = Object.create(ReadableStream.prototype); + InitializeReadableStream(stream); + const controller = Object.create(ReadableStreamDefaultController.prototype); + SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm); + return stream; +} +// Throws if and only if startAlgorithm throws. +function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) { + const stream = Object.create(ReadableStream.prototype); + InitializeReadableStream(stream); + const controller = Object.create(ReadableByteStreamController.prototype); + SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined); + return stream; +} +function InitializeReadableStream(stream) { + stream._state = 'readable'; + stream._reader = undefined; + stream._storedError = undefined; + stream._disturbed = false; +} +function IsReadableStream(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) { + return false; + } + return x instanceof ReadableStream; +} +function IsReadableStreamLocked(stream) { + if (stream._reader === undefined) { + return false; + } + return true; +} +// ReadableStream API exposed for controllers. +function ReadableStreamCancel(stream, reason) { + stream._disturbed = true; + if (stream._state === 'closed') { + return promiseResolvedWith(undefined); + } + if (stream._state === 'errored') { + return promiseRejectedWith(stream._storedError); + } + ReadableStreamClose(stream); + const reader = stream._reader; + if (reader !== undefined && IsReadableStreamBYOBReader(reader)) { + reader._readIntoRequests.forEach(readIntoRequest => { + readIntoRequest._closeSteps(undefined); + }); + reader._readIntoRequests = new SimpleQueue(); + } + const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason); + return transformPromiseWith(sourceCancelPromise, noop); +} +function ReadableStreamClose(stream) { + stream._state = 'closed'; + const reader = stream._reader; + if (reader === undefined) { + return; + } + defaultReaderClosedPromiseResolve(reader); + if (IsReadableStreamDefaultReader(reader)) { + reader._readRequests.forEach(readRequest => { + readRequest._closeSteps(); + }); + reader._readRequests = new SimpleQueue(); + } +} +function ReadableStreamError(stream, e) { + stream._state = 'errored'; + stream._storedError = e; + const reader = stream._reader; + if (reader === undefined) { + return; + } + defaultReaderClosedPromiseReject(reader, e); + if (IsReadableStreamDefaultReader(reader)) { + reader._readRequests.forEach(readRequest => { + readRequest._errorSteps(e); + }); + reader._readRequests = new SimpleQueue(); + } + else { + reader._readIntoRequests.forEach(readIntoRequest => { + readIntoRequest._errorSteps(e); + }); + reader._readIntoRequests = new SimpleQueue(); + } +} +// Helper functions for the ReadableStream. +function streamBrandCheckException$1(name) { + return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`); +} + +function convertQueuingStrategyInit(init, context) { + assertDictionary(init, context); + const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark; + assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit'); + return { + highWaterMark: convertUnrestrictedDouble(highWaterMark) + }; +} + +// The size function must not have a prototype property nor be a constructor +const byteLengthSizeFunction = (chunk) => { + return chunk.byteLength; +}; +try { + Object.defineProperty(byteLengthSizeFunction, 'name', { + value: 'size', + configurable: true + }); +} +catch (_a) { + // This property is non-configurable in older browsers, so ignore if this throws. + // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility +} +/** + * A queuing strategy that counts the number of bytes in each chunk. + * + * @public + */ +class ByteLengthQueuingStrategy { + constructor(options) { + assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy'); + options = convertQueuingStrategyInit(options, 'First parameter'); + this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark; + } + /** + * Returns the high water mark provided to the constructor. + */ + get highWaterMark() { + if (!IsByteLengthQueuingStrategy(this)) { + throw byteLengthBrandCheckException('highWaterMark'); + } + return this._byteLengthQueuingStrategyHighWaterMark; + } + /** + * Measures the size of `chunk` by returning the value of its `byteLength` property. + */ + get size() { + if (!IsByteLengthQueuingStrategy(this)) { + throw byteLengthBrandCheckException('size'); + } + return byteLengthSizeFunction; + } +} +Object.defineProperties(ByteLengthQueuingStrategy.prototype, { + highWaterMark: { enumerable: true }, + size: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, { + value: 'ByteLengthQueuingStrategy', + configurable: true + }); +} +// Helper functions for the ByteLengthQueuingStrategy. +function byteLengthBrandCheckException(name) { + return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`); +} +function IsByteLengthQueuingStrategy(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) { + return false; + } + return x instanceof ByteLengthQueuingStrategy; +} + +// The size function must not have a prototype property nor be a constructor +const countSizeFunction = () => { + return 1; +}; +try { + Object.defineProperty(countSizeFunction, 'name', { + value: 'size', + configurable: true + }); +} +catch (_a) { + // This property is non-configurable in older browsers, so ignore if this throws. + // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility +} +/** + * A queuing strategy that counts the number of chunks. + * + * @public + */ +class CountQueuingStrategy { + constructor(options) { + assertRequiredArgument(options, 1, 'CountQueuingStrategy'); + options = convertQueuingStrategyInit(options, 'First parameter'); + this._countQueuingStrategyHighWaterMark = options.highWaterMark; + } + /** + * Returns the high water mark provided to the constructor. + */ + get highWaterMark() { + if (!IsCountQueuingStrategy(this)) { + throw countBrandCheckException('highWaterMark'); + } + return this._countQueuingStrategyHighWaterMark; + } + /** + * Measures the size of `chunk` by always returning 1. + * This ensures that the total queue size is a count of the number of chunks in the queue. + */ + get size() { + if (!IsCountQueuingStrategy(this)) { + throw countBrandCheckException('size'); + } + return countSizeFunction; + } +} +Object.defineProperties(CountQueuingStrategy.prototype, { + highWaterMark: { enumerable: true }, + size: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, { + value: 'CountQueuingStrategy', + configurable: true + }); +} +// Helper functions for the CountQueuingStrategy. +function countBrandCheckException(name) { + return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`); +} +function IsCountQueuingStrategy(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) { + return false; + } + return x instanceof CountQueuingStrategy; +} + +function convertTransformer(original, context) { + assertDictionary(original, context); + const flush = original === null || original === void 0 ? void 0 : original.flush; + const readableType = original === null || original === void 0 ? void 0 : original.readableType; + const start = original === null || original === void 0 ? void 0 : original.start; + const transform = original === null || original === void 0 ? void 0 : original.transform; + const writableType = original === null || original === void 0 ? void 0 : original.writableType; + return { + flush: flush === undefined ? + undefined : + convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`), + readableType, + start: start === undefined ? + undefined : + convertTransformerStartCallback(start, original, `${context} has member 'start' that`), + transform: transform === undefined ? + undefined : + convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`), + writableType + }; +} +function convertTransformerFlushCallback(fn, original, context) { + assertFunction(fn, context); + return (controller) => promiseCall(fn, original, [controller]); +} +function convertTransformerStartCallback(fn, original, context) { + assertFunction(fn, context); + return (controller) => reflectCall(fn, original, [controller]); +} +function convertTransformerTransformCallback(fn, original, context) { + assertFunction(fn, context); + return (chunk, controller) => promiseCall(fn, original, [chunk, controller]); +} + +// Class TransformStream +/** + * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream}, + * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side. + * In a manner specific to the transform stream in question, writes to the writable side result in new data being + * made available for reading from the readable side. + * + * @public + */ +class TransformStream { + constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) { + if (rawTransformer === undefined) { + rawTransformer = null; + } + const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter'); + const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter'); + const transformer = convertTransformer(rawTransformer, 'First parameter'); + if (transformer.readableType !== undefined) { + throw new RangeError('Invalid readableType specified'); + } + if (transformer.writableType !== undefined) { + throw new RangeError('Invalid writableType specified'); + } + const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0); + const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy); + const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1); + const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy); + let startPromise_resolve; + const startPromise = newPromise(resolve => { + startPromise_resolve = resolve; + }); + InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm); + SetUpTransformStreamDefaultControllerFromTransformer(this, transformer); + if (transformer.start !== undefined) { + startPromise_resolve(transformer.start(this._transformStreamController)); + } + else { + startPromise_resolve(undefined); + } + } + /** + * The readable side of the transform stream. + */ + get readable() { + if (!IsTransformStream(this)) { + throw streamBrandCheckException('readable'); + } + return this._readable; + } + /** + * The writable side of the transform stream. + */ + get writable() { + if (!IsTransformStream(this)) { + throw streamBrandCheckException('writable'); + } + return this._writable; + } +} +Object.defineProperties(TransformStream.prototype, { + readable: { enumerable: true }, + writable: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, { + value: 'TransformStream', + configurable: true + }); +} +function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) { + function startAlgorithm() { + return startPromise; + } + function writeAlgorithm(chunk) { + return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk); + } + function abortAlgorithm(reason) { + return TransformStreamDefaultSinkAbortAlgorithm(stream, reason); + } + function closeAlgorithm() { + return TransformStreamDefaultSinkCloseAlgorithm(stream); + } + stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm); + function pullAlgorithm() { + return TransformStreamDefaultSourcePullAlgorithm(stream); + } + function cancelAlgorithm(reason) { + TransformStreamErrorWritableAndUnblockWrite(stream, reason); + return promiseResolvedWith(undefined); + } + stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm); + // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure. + stream._backpressure = undefined; + stream._backpressureChangePromise = undefined; + stream._backpressureChangePromise_resolve = undefined; + TransformStreamSetBackpressure(stream, true); + stream._transformStreamController = undefined; +} +function IsTransformStream(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) { + return false; + } + return x instanceof TransformStream; +} +// This is a no-op if both sides are already errored. +function TransformStreamError(stream, e) { + ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e); + TransformStreamErrorWritableAndUnblockWrite(stream, e); +} +function TransformStreamErrorWritableAndUnblockWrite(stream, e) { + TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController); + WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e); + if (stream._backpressure) { + // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure() + // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time + // _backpressure is set. + TransformStreamSetBackpressure(stream, false); + } +} +function TransformStreamSetBackpressure(stream, backpressure) { + // Passes also when called during construction. + if (stream._backpressureChangePromise !== undefined) { + stream._backpressureChangePromise_resolve(); + } + stream._backpressureChangePromise = newPromise(resolve => { + stream._backpressureChangePromise_resolve = resolve; + }); + stream._backpressure = backpressure; +} +// Class TransformStreamDefaultController +/** + * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}. + * + * @public + */ +class TransformStreamDefaultController { + constructor() { + throw new TypeError('Illegal constructor'); + } + /** + * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full. + */ + get desiredSize() { + if (!IsTransformStreamDefaultController(this)) { + throw defaultControllerBrandCheckException('desiredSize'); + } + const readableController = this._controlledTransformStream._readable._readableStreamController; + return ReadableStreamDefaultControllerGetDesiredSize(readableController); + } + enqueue(chunk = undefined) { + if (!IsTransformStreamDefaultController(this)) { + throw defaultControllerBrandCheckException('enqueue'); + } + TransformStreamDefaultControllerEnqueue(this, chunk); + } + /** + * Errors both the readable side and the writable side of the controlled transform stream, making all future + * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded. + */ + error(reason = undefined) { + if (!IsTransformStreamDefaultController(this)) { + throw defaultControllerBrandCheckException('error'); + } + TransformStreamDefaultControllerError(this, reason); + } + /** + * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the + * transformer only needs to consume a portion of the chunks written to the writable side. + */ + terminate() { + if (!IsTransformStreamDefaultController(this)) { + throw defaultControllerBrandCheckException('terminate'); + } + TransformStreamDefaultControllerTerminate(this); + } +} +Object.defineProperties(TransformStreamDefaultController.prototype, { + enqueue: { enumerable: true }, + error: { enumerable: true }, + terminate: { enumerable: true }, + desiredSize: { enumerable: true } +}); +if (typeof SymbolPolyfill.toStringTag === 'symbol') { + Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, { + value: 'TransformStreamDefaultController', + configurable: true + }); +} +// Transform Stream Default Controller Abstract Operations +function IsTransformStreamDefaultController(x) { + if (!typeIsObject(x)) { + return false; + } + if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) { + return false; + } + return x instanceof TransformStreamDefaultController; +} +function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) { + controller._controlledTransformStream = stream; + stream._transformStreamController = controller; + controller._transformAlgorithm = transformAlgorithm; + controller._flushAlgorithm = flushAlgorithm; +} +function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) { + const controller = Object.create(TransformStreamDefaultController.prototype); + let transformAlgorithm = (chunk) => { + try { + TransformStreamDefaultControllerEnqueue(controller, chunk); + return promiseResolvedWith(undefined); + } + catch (transformResultE) { + return promiseRejectedWith(transformResultE); + } + }; + let flushAlgorithm = () => promiseResolvedWith(undefined); + if (transformer.transform !== undefined) { + transformAlgorithm = chunk => transformer.transform(chunk, controller); + } + if (transformer.flush !== undefined) { + flushAlgorithm = () => transformer.flush(controller); + } + SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm); +} +function TransformStreamDefaultControllerClearAlgorithms(controller) { + controller._transformAlgorithm = undefined; + controller._flushAlgorithm = undefined; +} +function TransformStreamDefaultControllerEnqueue(controller, chunk) { + const stream = controller._controlledTransformStream; + const readableController = stream._readable._readableStreamController; + if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) { + throw new TypeError('Readable side is not in a state that permits enqueue'); + } + // We throttle transform invocations based on the backpressure of the ReadableStream, but we still + // accept TransformStreamDefaultControllerEnqueue() calls. + try { + ReadableStreamDefaultControllerEnqueue(readableController, chunk); + } + catch (e) { + // This happens when readableStrategy.size() throws. + TransformStreamErrorWritableAndUnblockWrite(stream, e); + throw stream._readable._storedError; + } + const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController); + if (backpressure !== stream._backpressure) { + TransformStreamSetBackpressure(stream, true); + } +} +function TransformStreamDefaultControllerError(controller, e) { + TransformStreamError(controller._controlledTransformStream, e); +} +function TransformStreamDefaultControllerPerformTransform(controller, chunk) { + const transformPromise = controller._transformAlgorithm(chunk); + return transformPromiseWith(transformPromise, undefined, r => { + TransformStreamError(controller._controlledTransformStream, r); + throw r; + }); +} +function TransformStreamDefaultControllerTerminate(controller) { + const stream = controller._controlledTransformStream; + const readableController = stream._readable._readableStreamController; + ReadableStreamDefaultControllerClose(readableController); + const error = new TypeError('TransformStream terminated'); + TransformStreamErrorWritableAndUnblockWrite(stream, error); +} +// TransformStreamDefaultSink Algorithms +function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) { + const controller = stream._transformStreamController; + if (stream._backpressure) { + const backpressureChangePromise = stream._backpressureChangePromise; + return transformPromiseWith(backpressureChangePromise, () => { + const writable = stream._writable; + const state = writable._state; + if (state === 'erroring') { + throw writable._storedError; + } + return TransformStreamDefaultControllerPerformTransform(controller, chunk); + }); + } + return TransformStreamDefaultControllerPerformTransform(controller, chunk); +} +function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) { + // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already + // errored. + TransformStreamError(stream, reason); + return promiseResolvedWith(undefined); +} +function TransformStreamDefaultSinkCloseAlgorithm(stream) { + // stream._readable cannot change after construction, so caching it across a call to user code is safe. + const readable = stream._readable; + const controller = stream._transformStreamController; + const flushPromise = controller._flushAlgorithm(); + TransformStreamDefaultControllerClearAlgorithms(controller); + // Return a promise that is fulfilled with undefined on success. + return transformPromiseWith(flushPromise, () => { + if (readable._state === 'errored') { + throw readable._storedError; + } + ReadableStreamDefaultControllerClose(readable._readableStreamController); + }, r => { + TransformStreamError(stream, r); + throw readable._storedError; + }); +} +// TransformStreamDefaultSource Algorithms +function TransformStreamDefaultSourcePullAlgorithm(stream) { + // Invariant. Enforced by the promises returned by start() and pull(). + TransformStreamSetBackpressure(stream, false); + // Prevent the next pull() call until there is backpressure. + return stream._backpressureChangePromise; +} +// Helper functions for the TransformStreamDefaultController. +function defaultControllerBrandCheckException(name) { + return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`); +} +// Helper functions for the TransformStream. +function streamBrandCheckException(name) { + return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`); +} + +export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter }; +//# sourceMappingURL=ponyfill.es6.mjs.map diff --git a/templates/example.html b/templates/example.html index 71c003125b..1ba3b6d546 100644 --- a/templates/example.html +++ b/templates/example.html @@ -12,7 +12,15 @@

{{ category.title }} / {{ page.title }}

View in GitHub - +
+
+
+
+
+
+
+ +
{% set code = load_data(path="content/examples/" ~ page.components[1] ~ "/" ~ page.title ~ "/" ~ page.title ~ ".rs") %} {% set data = "```rust @@ -22,7 +30,50 @@

{{ category.title }} / {{ page.title }}

{% endblock content %}