// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
// @ts-check
///
///
///
((window) => {
const customInspect = Symbol.for("Deno.customInspect");
class AssertionError extends Error {
constructor(msg) {
super(msg);
this.name = "AssertionError";
}
}
/**
* @param {unknown} cond
* @param {string=} msg
* @returns {asserts cond}
*/
function assert(cond, msg = "Assertion failed.") {
if (!cond) {
throw new AssertionError(msg);
}
}
/** @template T */
class Deferred {
/** @type {Promise} */
#promise;
/** @type {(reject?: any) => void} */
#reject;
/** @type {(value: T | PromiseLike) => void} */
#resolve;
/** @type {"pending" | "fulfilled"} */
#state = "pending";
constructor() {
this.#promise = new Promise((resolve, reject) => {
this.#resolve = resolve;
this.#reject = reject;
});
}
/** @returns {Promise} */
get promise() {
return this.#promise;
}
/** @returns {"pending" | "fulfilled"} */
get state() {
return this.#state;
}
/** @param {any=} reason */
reject(reason) {
// already settled promises are a no-op
if (this.#state !== "pending") {
return;
}
this.#state = "fulfilled";
this.#reject(reason);
}
/** @param {T | PromiseLike} value */
resolve(value) {
// already settled promises are a no-op
if (this.#state !== "pending") {
return;
}
this.#state = "fulfilled";
this.#resolve(value);
}
}
/**
* @param {(...args: any[]) => any} fn
* @param {boolean} enforcePromise
* @returns {(...args: any[]) => any}
*/
function reflectApply(fn, enforcePromise) {
if (typeof fn !== "function") {
throw new TypeError("The property must be a function.");
}
return function (...args) {
if (enforcePromise) {
try {
return resolvePromiseWith(Reflect.apply(fn, this, args));
} catch (err) {
return Promise.reject(err);
}
}
return Reflect.apply(fn, this, args);
};
}
/**
* @template I
* @template O
* @param {Transformer} transformer
* @returns {Transformer}
*/
function convertTransformer(transformer) {
const transformerDict = Object.create(null);
if (transformer === null) {
return transformerDict;
}
if ("flush" in transformer) {
transformerDict.flush = reflectApply(transformer.flush, true);
}
if ("readableType" in transformer) {
transformerDict.readableType = transformer.readableType;
}
if ("start" in transformer) {
transformerDict.start = reflectApply(transformer.start, false);
}
if ("transform" in transformer) {
transformerDict.transform = reflectApply(transformer.transform, true);
}
if ("writableType" in transformer) {
transformerDict.writableType = transformer.writableType;
}
return transformerDict;
}
/**
* @template W
* @param {UnderlyingSink} underlyingSink
* @returns {UnderlyingSink}
*/
function convertUnderlyingSink(underlyingSink) {
const underlyingSinkDict = Object.create(null);
if (underlyingSink === null) {
return underlyingSinkDict;
}
if ("abort" in underlyingSink) {
underlyingSinkDict.abort = reflectApply(underlyingSink.abort, true);
}
if ("close" in underlyingSink) {
underlyingSinkDict.close = reflectApply(underlyingSink.close, true);
}
if ("start" in underlyingSink) {
underlyingSinkDict.start = reflectApply(underlyingSink.start, false);
}
if (underlyingSink.type) {
underlyingSinkDict.type = underlyingSink.type;
}
if ("write" in underlyingSink) {
underlyingSinkDict.write = reflectApply(underlyingSink.write, true);
}
return underlyingSinkDict;
}
/**
* @template R
* @param {UnderlyingSource} underlyingSource
* @returns {UnderlyingSource}
*/
function convertUnderlyingSource(underlyingSource) {
const underlyingSourceDict = Object.create(null);
if (underlyingSource === null) {
throw new TypeError("Underlying source cannot be null");
}
if (underlyingSource === undefined) {
return underlyingSourceDict;
}
if ("cancel" in underlyingSource) {
underlyingSourceDict.cancel = reflectApply(underlyingSource.cancel, true);
}
if ("pull" in underlyingSource) {
underlyingSourceDict.pull = reflectApply(underlyingSource.pull, true);
}
if ("start" in underlyingSource) {
underlyingSourceDict.start = reflectApply(underlyingSource.start, false);
}
if (underlyingSource.type !== undefined) {
if (underlyingSourceDict.type === null) {
throw new TypeError("type cannot be null");
}
const type = String(underlyingSource.type);
if (type !== "bytes") {
throw new TypeError("invalid underlying source type");
}
underlyingSourceDict.type = type;
}
return underlyingSourceDict;
}
const originalPromise = Promise;
const originalPromiseThen = Promise.prototype.then;
/**
* @template T
* @template TResult1
* @template TResult2
* @param {Promise} promise
* @param {(value: T) => TResult1 | PromiseLike} onFulfilled
* @param {(reason: any) => TResult2 | PromiseLike=} onRejected
* @returns {Promise}
*/
function performPromiseThen(promise, onFulfilled, onRejected) {
return originalPromiseThen.call(promise, onFulfilled, onRejected);
}
/**
* @template T
* @param {T | PromiseLike} value
* @returns {Promise}
*/
function resolvePromiseWith(value) {
return new originalPromise((resolve) => resolve(value));
}
/** @param {any} e */
function rethrowAssertionErrorRejection(e) {
if (e && e instanceof AssertionError) {
queueMicrotask(() => {
console.error(`Internal Error: ${e.stack}`);
});
}
}
/** @param {Promise} promise */
function setPromiseIsHandledToTrue(promise) {
performPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
}
/**
* @template T
* @template TResult1
* @template TResult2
* @param {Promise} promise
* @param {(value: T) => TResult1 | PromiseLike} fulfillmentHandler
* @param {(reason: any) => TResult2 | PromiseLike=} rejectionHandler
* @returns {Promise}
*/
function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
return performPromiseThen(promise, fulfillmentHandler, rejectionHandler);
}
/**
* @template T
* @template TResult
* @param {Promise} promise
* @param {(value: T) => TResult | PromiseLike} onFulfilled
* @returns {void}
*/
function uponFulfillment(promise, onFulfilled) {
uponPromise(promise, onFulfilled);
}
/**
* @template T
* @template TResult
* @param {Promise} promise
* @param {(value: T) => TResult | PromiseLike} onRejected
* @returns {void}
*/
function uponRejection(promise, onRejected) {
uponPromise(promise, undefined, onRejected);
}
/**
* @template T
* @template TResult1
* @template TResult2
* @param {Promise} promise
* @param {(value: T) => TResult1 | PromiseLike} onFulfilled
* @param {(reason: any) => TResult2 | PromiseLike=} onRejected
* @returns {void}
*/
function uponPromise(promise, onFulfilled, onRejected) {
performPromiseThen(
performPromiseThen(promise, onFulfilled, onRejected),
undefined,
rethrowAssertionErrorRejection,
);
}
const isFakeDetached = Symbol("<>");
/**
* @param {ArrayBufferLike} O
* @returns {boolean}
*/
function isDetachedBuffer(O) {
return isFakeDetached in O;
}
/**
* @param {ArrayBufferLike} O
* @returns {ArrayBufferLike}
*/
function transferArrayBuffer(O) {
assert(!isDetachedBuffer(O));
const transferredIshVersion = O.slice(0);
Object.defineProperty(O, "byteLength", {
get() {
return 0;
},
});
O[isFakeDetached] = true;
return transferredIshVersion;
}
const _abortAlgorithm = Symbol("[[abortAlgorithm]]");
const _abortSteps = Symbol("[[AbortSteps]]");
const _autoAllocateChunkSize = Symbol("[[autoAllocateChunkSize]]");
const _backpressure = Symbol("[[backpressure]]");
const _backpressureChangePromise = Symbol("[[backpressureChangePromise]]");
const _byobRequest = Symbol("[[byobRequest]]");
const _cancelAlgorithm = Symbol("[[cancelAlgorithm]]");
const _cancelSteps = Symbol("[[CancelSteps]]");
const _close = Symbol("close sentinel");
const _closeAlgorithm = Symbol("[[closeAlgorithm]]");
const _closedPromise = Symbol("[[closedPromise]]");
const _closeRequest = Symbol("[[closeRequest]]");
const _closeRequested = Symbol("[[closeRequested]]");
const _controller = Symbol("[[controller]]");
const _detached = Symbol("[[Detached]]");
const _disturbed = Symbol("[[disturbed]]");
const _errorSteps = Symbol("[[ErrorSteps]]");
const _flushAlgorithm = Symbol("[[flushAlgorithm]]");
const _globalObject = Symbol("[[globalObject]]");
const _inFlightCloseRequest = Symbol("[[inFlightCloseRequest]]");
const _inFlightWriteRequest = Symbol("[[inFlightWriteRequest]]");
const _pendingAbortRequest = Symbol("[pendingAbortRequest]");
const _preventCancel = Symbol("[[preventCancel]]");
const _pullAgain = Symbol("[[pullAgain]]");
const _pullAlgorithm = Symbol("[[pullAlgorithm]]");
const _pulling = Symbol("[[pulling]]");
const _pullSteps = Symbol("[[PullSteps]]");
const _queue = Symbol("[[queue]]");
const _queueTotalSize = Symbol("[[queueTotalSize]]");
const _readable = Symbol("[[readable]]");
const _reader = Symbol("[[reader]]");
const _readRequests = Symbol("[[readRequests]]");
const _readyPromise = Symbol("[[readyPromise]]");
const _started = Symbol("[[started]]");
const _state = Symbol("[[state]]");
const _storedError = Symbol("[[storedError]]");
const _strategyHWM = Symbol("[[strategyHWM]]");
const _strategySizeAlgorithm = Symbol("[[strategySizeAlgorithm]]");
const _stream = Symbol("[[stream]]");
const _transformAlgorithm = Symbol("[[transformAlgorithm]]");
const _writable = Symbol("[[writable]]");
const _writeAlgorithm = Symbol("[[writeAlgorithm]]");
const _writer = Symbol("[[writer]]");
const _writeRequests = Symbol("[[writeRequests]]");
/**
* @template R
* @param {ReadableStream} stream
* @returns {ReadableStreamDefaultReader}
*/
function acquireReadableStreamDefaultReader(stream) {
return new ReadableStreamDefaultReader(stream);
}
/**
* @template W
* @param {WritableStream} stream
* @returns {WritableStreamDefaultWriter}
*/
function acquireWritableStreamDefaultWriter(stream) {
return new WritableStreamDefaultWriter(stream);
}
/**
* @template R
* @param {() => void} startAlgorithm
* @param {() => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number=} highWaterMark
* @param {((chunk: R) => number)=} sizeAlgorithm
* @returns {ReadableStream}
*/
function createReadableStream(
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark = 1,
sizeAlgorithm = () => 1,
) {
assert(isNonNegativeNumber(highWaterMark));
/** @type {ReadableStream} */
const stream = Object.create(ReadableStream.prototype);
initializeReadableStream(stream);
const controller = Object.create(ReadableStreamDefaultController.prototype);
setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
);
return stream;
}
/**
* @template W
* @param {(controller: WritableStreamDefaultController) => Promise} startAlgorithm
* @param {(chunk: W) => Promise} writeAlgorithm
* @param {() => Promise} closeAlgorithm
* @param {(reason: any) => Promise} abortAlgorithm
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
* @returns {WritableStream}
*/
function createWritableStream(
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(isNonNegativeNumber(highWaterMark));
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;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @returns {T}
*/
function dequeueValue(container) {
assert(_queue in container && _queueTotalSize in container);
assert(container[_queue].length);
const valueWithSize = container[_queue].shift();
container[_queueTotalSize] -= valueWithSize.size;
if (container[_queueTotalSize] < 0) {
container[_queueTotalSize] = 0;
}
return valueWithSize.value;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @param {T} value
* @param {number} size
* @returns {void}
*/
function enqueueValueWithSize(container, value, size) {
assert(_queue in container && _queueTotalSize in container);
if (isNonNegativeNumber(size) === false) {
throw RangeError("chunk size isn't a positive number");
}
if (size === Infinity) {
throw RangeError("chunk size is invalid");
}
container[_queue].push({ value, size });
container[_queueTotalSize] += size;
}
/**
* @param {QueuingStrategy} strategy
* @param {number} defaultHWM
*/
function extractHighWaterMark(strategy, defaultHWM) {
if (!("highWaterMark" in strategy)) {
return defaultHWM;
}
const highWaterMark = Number(strategy.highWaterMark);
if (Number.isNaN(highWaterMark) || highWaterMark < 0) {
throw RangeError(
`Expected highWaterMark to be a positive number or Infinity, got "${highWaterMark}".`,
);
}
return highWaterMark;
}
/**
* @template T
* @param {QueuingStrategy} strategy
* @return {(chunk: T) => number}
*/
function extractSizeAlgorithm(strategy) {
const { size } = strategy;
if (!size) {
return () => 1;
}
return (chunk) => size(chunk);
}
/**
* @param {ReadableStream} stream
* @returns {void}
*/
function initializeReadableStream(stream) {
stream[_state] = "readable";
stream[_reader] = stream[_storedError] = undefined;
stream[_disturbed] = false;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {Deferred} startPromise
* @param {number} writableHighWaterMark
* @param {(chunk: I) => number} writableSizeAlgorithm
* @param {number} readableHighWaterMark
* @param {(chunk: O) => number} readableSizeAlgorithm
*/
function initializeTransformStream(
stream,
startPromise,
writableHighWaterMark,
writableSizeAlgorithm,
readableHighWaterMark,
readableSizeAlgorithm,
) {
function startAlgorithm() {
return startPromise.promise;
}
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 resolvePromiseWith(undefined);
}
stream[_readable] = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
readableHighWaterMark,
readableSizeAlgorithm,
);
stream[_backpressure] = stream[_backpressureChangePromise] = undefined;
transformStreamSetBackpressure(stream, true);
stream[_controller] = undefined;
}
/** @param {WritableStream} stream */
function initializeWritableStream(stream) {
stream[_state] = "writable";
stream[_storedError] = stream[_writer] = stream[_controller] =
stream[_inFlightWriteRequest] = stream[_closeRequest] =
stream[_inFlightCloseRequest] = stream[_pendingAbortRequest] =
undefined;
stream[_writeRequests] = [];
stream[_backpressure] = false;
}
/**
* @param {unknown} v
* @returns {v is number}
*/
function isNonNegativeNumber(v) {
if (typeof v !== "number") {
return false;
}
if (Number.isNaN(v)) {
return false;
}
if (v < 0) {
return false;
}
return true;
}
/**
* @param {unknown} value
* @returns {value is ReadableStream}
*/
function isReadableStream(value) {
return !(typeof value !== "object" || value === null ||
!(_controller in value));
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function isReadableStreamLocked(stream) {
if (stream[_reader] === undefined) {
return false;
}
return true;
}
/**
* @param {unknown} value
* @returns {value is ReadableStreamDefaultReader}
*/
function isReadableStreamDefaultReader(value) {
return !(typeof value !== "object" || value === null ||
!(_readRequests in value));
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function isReadableStreamDisturbed(stream) {
assert(isReadableStream(stream));
return stream[_disturbed];
}
/**
* @param {unknown} value
* @returns {value is WritableStream}
*/
function isWritableStream(value) {
return !(typeof value !== "object" || value === null ||
!(_controller in value));
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function isWritableStreamLocked(stream) {
if (stream[_writer] === undefined) {
return false;
}
return true;
}
/**
* @template T
* @param {{ [_queue]: Array>, [_queueTotalSize]: number }} container
* @returns {T | _close}
*/
function peekQueueValue(container) {
assert(_queue in container && _queueTotalSize in container);
assert(container[_queue].length);
const valueWithSize = container[_queue][0];
return valueWithSize.value;
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerCallPullIfNeeded(controller) {
const shouldPull = readableByteStreamControllerShouldCallPull(controller);
if (!shouldPull) {
return;
}
if (controller[_pulling]) {
controller[_pullAgain] = true;
return;
}
assert(controller[_pullAgain] === false);
controller[_pulling] = true;
/** @type {Promise} */
const pullPromise = controller[_pullAlgorithm](controller);
setPromiseIsHandledToTrue(
pullPromise.then(
() => {
controller[_pulling] = false;
if (controller[_pullAgain]) {
controller[_pullAgain] = false;
readableByteStreamControllerCallPullIfNeeded(controller);
}
},
(e) => {
readableByteStreamControllerError(controller, e);
},
),
);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerClearAlgorithms(controller) {
controller[_pullAlgorithm] = undefined;
controller[_cancelAlgorithm] = undefined;
}
/**
* @param {ReadableByteStreamController} controller
* @param {any} e
*/
function readableByteStreamControllerError(controller, e) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (stream[_state] !== "readable") {
return;
}
// 3. Perform ! ReadableByteStreamControllerClearPendingPullIntos(controller).
resetQueue(controller);
readableByteStreamControllerClearAlgorithms(controller);
readableStreamError(stream, e);
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerClose(controller) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (controller[_closeRequested] || stream[_state] !== "readable") {
return;
}
if (controller[_queueTotalSize] > 0) {
controller[_closeRequested] = true;
return;
}
// 3.13.6.4 If controller.[[pendingPullIntos]] is not empty, (BYOB Support)
readableByteStreamControllerClearAlgorithms(controller);
readableStreamClose(stream);
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferView} chunk
*/
function readableByteStreamControllerEnqueue(controller, chunk) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (
controller[_closeRequested] ||
controller[_stream][_state] !== "readable"
) {
return;
}
const { buffer, byteOffset, byteLength } = chunk;
const transferredBuffer = transferArrayBuffer(buffer);
if (readableStreamHasDefaultReader(stream)) {
if (readableStreamGetNumReadRequests(stream) === 0) {
readableByteStreamControllerEnqueueChunkToQueue(
controller,
transferredBuffer,
byteOffset,
byteLength,
);
} else {
assert(controller[_queue].length === 0);
const transferredView = new Uint8Array(
transferredBuffer,
byteOffset,
byteLength,
);
readableStreamFulfillReadRequest(stream, transferredView, false);
}
// 8 Otherwise, if ! ReadableStreamHasBYOBReader(stream) is true,
} else {
assert(isReadableStreamLocked(stream) === false);
readableByteStreamControllerEnqueueChunkToQueue(
controller,
transferredBuffer,
byteOffset,
byteLength,
);
}
readableByteStreamControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableByteStreamController} controller
* @param {ArrayBufferLike} buffer
* @param {number} byteOffset
* @param {number} byteLength
* @returns {void}
*/
function readableByteStreamControllerEnqueueChunkToQueue(
controller,
buffer,
byteOffset,
byteLength,
) {
controller[_queue].push({ buffer, byteOffset, byteLength });
controller[_queueTotalSize] += byteLength;
}
/**
* @param {ReadableByteStreamController} controller
* @returns {number | null}
*/
function readableByteStreamControllerGetDesiredSize(controller) {
const state = controller[_stream][_state];
if (state === "errored") {
return null;
}
if (state === "closed") {
return 0;
}
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/**
* @param {{ [_queue]: any[], [_queueTotalSize]: number }} container
* @returns {void}
*/
function resetQueue(container) {
container[_queue] = [];
container[_queueTotalSize] = 0;
}
/**
* @param {ReadableByteStreamController} controller
* @returns {void}
*/
function readableByteStreamControllerHandleQueueDrain(controller) {
assert(controller[_stream][_state] === "readable");
if (
controller[_queueTotalSize] === 0 && controller[_closeRequested]
) {
readableByteStreamControllerClearAlgorithms(controller);
readableStreamClose(controller[_stream]);
} else {
readableByteStreamControllerCallPullIfNeeded(controller);
}
}
/**
* @param {ReadableByteStreamController} controller
* @returns {boolean}
*/
function readableByteStreamControllerShouldCallPull(controller) {
/** @type {ReadableStream} */
const stream = controller[_stream];
if (
stream[_state] !== "readable" ||
controller[_closeRequested] ||
!controller[_started]
) {
return false;
}
if (
readableStreamHasDefaultReader(stream) &&
readableStreamGetNumReadRequests(stream) > 0
) {
return true;
}
// 3.13.25.6 If ! ReadableStreamHasBYOBReader(stream) is true and !
// ReadableStreamGetNumReadIntoRequests(stream) > 0, return true.
const desiredSize = readableByteStreamControllerGetDesiredSize(controller);
assert(desiredSize !== null);
return desiredSize > 0;
}
/**
* @template R
* @param {ReadableStream} stream
* @param {ReadRequest} readRequest
* @returns {void}
*/
function readableStreamAddReadRequest(stream, readRequest) {
assert(isReadableStreamDefaultReader(stream[_reader]));
assert(stream[_state] === "readable");
stream[_reader][_readRequests].push(readRequest);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function readableStreamCancel(stream, reason) {
stream[_disturbed] = true;
if (stream[_state] === "closed") {
return resolvePromiseWith(undefined);
}
if (stream[_state] === "errored") {
return Promise.reject(stream[_storedError]);
}
readableStreamClose(stream);
/** @type {Promise} */
const sourceCancelPromise = stream[_controller][_cancelSteps](reason);
return sourceCancelPromise.then(() => undefined);
}
/**
* @template R
* @param {ReadableStream} stream
* @returns {void}
*/
function readableStreamClose(stream) {
assert(stream[_state] === "readable");
stream[_state] = "closed";
/** @type {ReadableStreamDefaultReader | undefined} */
const reader = stream[_reader];
if (!reader) {
return;
}
if (isReadableStreamDefaultReader(reader)) {
/** @type {Array>} */
const readRequests = reader[_readRequests];
for (const readRequest of readRequests) {
readRequest.closeSteps();
}
reader[_readRequests] = [];
}
// This promise can be double resolved.
// See: https://github.com/whatwg/streams/issues/1100
reader[_closedPromise].resolve(undefined);
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerCallPullIfNeeded(controller) {
const shouldPull = readableStreamDefaultcontrollerShouldCallPull(
controller,
);
if (shouldPull === false) {
return;
}
if (controller[_pulling] === true) {
controller[_pullAgain] = true;
return;
}
assert(controller[_pullAgain] === false);
controller[_pulling] = true;
const pullPromise = controller[_pullAlgorithm](controller);
uponFulfillment(pullPromise, () => {
controller[_pulling] = false;
if (controller[_pullAgain] === true) {
controller[_pullAgain] = false;
readableStreamDefaultControllerCallPullIfNeeded(controller);
}
});
uponRejection(pullPromise, (e) => {
readableStreamDefaultControllerError(controller, e);
});
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {boolean}
*/
function readableStreamDefaultControllerCanCloseOrEnqueue(controller) {
const state = controller[_stream][_state];
if (controller[_closeRequested] === false && state === "readable") {
return true;
} else {
return false;
}
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerClearAlgorithms(controller) {
controller[_pullAlgorithm] = undefined;
controller[_cancelAlgorithm] = undefined;
controller[_strategySizeAlgorithm] = undefined;
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultControllerClose(controller) {
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return;
}
const stream = controller[_stream];
controller[_closeRequested] = true;
if (controller[_queue].length === 0) {
readableStreamDefaultControllerClearAlgorithms(controller);
readableStreamClose(stream);
}
}
/**
* @template R
* @param {ReadableStreamDefaultController} controller
* @param {R} chunk
* @returns {void}
*/
function readableStreamDefaultControllerEnqueue(controller, chunk) {
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return;
}
const stream = controller[_stream];
if (
isReadableStreamLocked(stream) === true &&
readableStreamGetNumReadRequests(stream) > 0
) {
readableStreamFulfillReadRequest(stream, chunk, false);
} else {
let chunkSize;
try {
chunkSize = controller[_strategySizeAlgorithm](chunk);
} catch (e) {
readableStreamDefaultControllerError(controller, e);
throw e;
}
try {
enqueueValueWithSize(controller, chunk, chunkSize);
} catch (e) {
readableStreamDefaultControllerError(controller, e);
throw e;
}
}
readableStreamDefaultControllerCallPullIfNeeded(controller);
}
/**
* @param {ReadableStreamDefaultController} controller
* @param {any} e
*/
function readableStreamDefaultControllerError(controller, e) {
const stream = controller[_stream];
if (stream[_state] !== "readable") {
return;
}
resetQueue(controller);
readableStreamDefaultControllerClearAlgorithms(controller);
readableStreamError(stream, e);
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {number | null}
*/
function readableStreamDefaultControllerGetDesiredSize(controller) {
const state = controller[_stream][_state];
if (state === "errored") {
return null;
}
if (state === "closed") {
return 0;
}
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/** @param {ReadableStreamDefaultController} controller */
function readableStreamDefaultcontrollerHasBackpressure(controller) {
if (readableStreamDefaultcontrollerShouldCallPull(controller) === true) {
return false;
} else {
return true;
}
}
/**
* @param {ReadableStreamDefaultController} controller
* @returns {boolean}
*/
function readableStreamDefaultcontrollerShouldCallPull(controller) {
const stream = controller[_stream];
if (
readableStreamDefaultControllerCanCloseOrEnqueue(controller) === false
) {
return false;
}
if (controller[_started] === false) {
return false;
}
if (
isReadableStreamLocked(stream) &&
readableStreamGetNumReadRequests(stream) > 0
) {
return true;
}
const desiredSize = readableStreamDefaultControllerGetDesiredSize(
controller,
);
assert(desiredSize !== null);
if (desiredSize > 0) {
return true;
}
return false;
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
* @param {ReadRequest} readRequest
* @returns {void}
*/
function readableStreamDefaultReaderRead(reader, readRequest) {
const stream = reader[_stream];
assert(stream);
stream[_disturbed] = true;
if (stream[_state] === "closed") {
readRequest.closeSteps();
} else if (stream[_state] === "errored") {
readRequest.errorSteps(stream[_storedError]);
} else {
assert(stream[_state] === "readable");
stream[_controller][_pullSteps](readRequest);
}
}
/**
* @template R
* @param {ReadableStream} stream
* @param {any} e
*/
function readableStreamError(stream, e) {
assert(stream[_state] === "readable");
stream[_state] = "errored";
stream[_storedError] = e;
/** @type {ReadableStreamDefaultReader | undefined} */
const reader = stream[_reader];
if (reader === undefined) {
return;
}
if (isReadableStreamDefaultReader(reader)) {
/** @type {Array>} */
const readRequests = reader[_readRequests];
for (const readRequest of readRequests) {
readRequest.errorSteps(e);
}
reader[_readRequests] = [];
}
// 3.5.6.8 Otherwise, support BYOB Reader
/** @type {Deferred} */
const closedPromise = reader[_closedPromise];
console.log("closedPromise rejected");
closedPromise.reject(e);
setPromiseIsHandledToTrue(closedPromise.promise);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {R} chunk
* @param {boolean} done
*/
function readableStreamFulfillReadRequest(stream, chunk, done) {
assert(readableStreamHasDefaultReader(stream) === true);
/** @type {ReadableStreamDefaultReader} */
const reader = stream[_reader];
assert(reader[_readRequests].length);
/** @type {ReadRequest} */
const readRequest = reader[_readRequests].shift();
if (done) {
readRequest.closeSteps();
} else {
readRequest.chunkSteps(chunk);
}
}
/**
* @param {ReadableStream} stream
* @return {number}
*/
function readableStreamGetNumReadRequests(stream) {
assert(readableStreamHasDefaultReader(stream) === true);
return stream[_reader][_readRequests].length;
}
/**
* @param {ReadableStream} stream
* @returns {boolean}
*/
function readableStreamHasDefaultReader(stream) {
const reader = stream[_reader];
if (reader === undefined) {
return false;
}
if (isReadableStreamDefaultReader(reader)) {
return true;
}
return false;
}
/**
* @template T
* @param {ReadableStream} source
* @param {WritableStream} dest
* @param {boolean} preventClose
* @param {boolean} preventAbort
* @param {boolean} preventCancel
* @param {AbortSignal=} signal
* @returns {Promise}
*/
function readableStreamPipeTo(
source,
dest,
preventClose,
preventAbort,
preventCancel,
signal,
) {
assert(isReadableStream(source));
assert(isWritableStream(dest));
assert(
typeof preventClose === "boolean" && typeof preventAbort === "boolean" &&
typeof preventCancel === "boolean",
);
assert(signal === undefined || signal instanceof AbortSignal);
assert(!isReadableStreamLocked(source));
assert(!isWritableStreamLocked(dest));
const reader = acquireReadableStreamDefaultReader(source);
const writer = acquireWritableStreamDefaultWriter(dest);
source[_disturbed] = true;
let shuttingDown = false;
let currentWrite = resolvePromiseWith(undefined);
/** @type {Deferred} */
const promise = new Deferred();
/** @type {() => void} */
let abortAlgorithm;
if (signal) {
abortAlgorithm = () => {
const error = new DOMException("Aborted", "AbortError");
/** @type {Array<() => Promise>} */
const actions = [];
if (preventAbort === false) {
actions.push(() => {
if (dest[_state] === "writable") {
return writableStreamAbort(dest, error);
} else {
return resolvePromiseWith(undefined);
}
});
}
if (preventCancel === false) {
actions.push(() => {
if (source[_state] === "readable") {
return readableStreamCancel(source, error);
} else {
return resolvePromiseWith(undefined);
}
});
}
shutdownWithAction(
() => Promise.all(actions.map((action) => action())),
true,
error,
);
};
if (signal.aborted) {
abortAlgorithm();
return promise.promise;
}
signal.addEventListener("abort", abortAlgorithm);
}
function pipeLoop() {
return new Promise((resolveLoop, rejectLoop) => {
/** @param {boolean} done */
function next(done) {
if (done) {
resolveLoop();
} else {
uponPromise(pipeStep(), next, rejectLoop);
}
}
next(false);
});
}
/** @returns {Promise} */
function pipeStep() {
if (shuttingDown === true) {
return resolvePromiseWith(true);
}
return transformPromiseWith(writer[_readyPromise].promise, () => {
return new Promise((resolveRead, rejectRead) => {
readableStreamDefaultReaderRead(
reader,
{
chunkSteps(chunk) {
currentWrite = transformPromiseWith(
writableStreamDefaultWriterWrite(writer, chunk),
undefined,
() => {},
);
resolveRead(false);
},
closeSteps() {
resolveRead(true);
},
errorSteps: rejectRead,
},
);
});
});
}
isOrBecomesErrored(
source,
reader[_closedPromise].promise,
(storedError) => {
if (preventAbort === false) {
shutdownWithAction(
() => writableStreamAbort(dest, storedError),
true,
storedError,
);
} else {
shutdown(true, storedError);
}
},
);
isOrBecomesErrored(dest, writer[_closedPromise].promise, (storedError) => {
if (preventCancel === false) {
shutdownWithAction(
() => readableStreamCancel(source, storedError),
true,
storedError,
);
} else {
shutdown(true, storedError);
}
});
isOrBecomesClosed(source, reader[_closedPromise].promise, () => {
if (preventClose === false) {
shutdownWithAction(() =>
writableStreamDefaultWriterCloseWithErrorPropagation(writer)
);
} else {
shutdown();
}
});
if (
writableStreamCloseQueuedOrInFlight(dest) === true ||
dest[_state] === "closed"
) {
const destClosed = new TypeError(
"The destination writable stream closed before all the data could be piped to it.",
);
if (preventCancel === false) {
shutdownWithAction(
() => readableStreamCancel(source, destClosed),
true,
destClosed,
);
} else {
shutdown(true, destClosed);
}
}
setPromiseIsHandledToTrue(pipeLoop());
return promise.promise;
/** @returns {Promise} */
function waitForWritesToFinish() {
const oldCurrentWrite = currentWrite;
return transformPromiseWith(
currentWrite,
() =>
oldCurrentWrite !== currentWrite
? waitForWritesToFinish()
: undefined,
);
}
/**
* @param {ReadableStream | WritableStream} stream
* @param {Promise} promise
* @param {(e: any) => void} action
*/
function isOrBecomesErrored(stream, promise, action) {
if (stream[_state] === "errored") {
action(stream[_storedError]);
} else {
uponRejection(promise, action);
}
}
/**
* @param {ReadableStream} stream
* @param {Promise} promise
* @param {() => void} action
*/
function isOrBecomesClosed(stream, promise, action) {
if (stream[_state] === "closed") {
action();
} else {
uponFulfillment(promise, action);
}
}
/**
* @param {() => Promise} action
* @param {boolean=} originalIsError
* @param {any=} originalError
*/
function shutdownWithAction(action, originalIsError, originalError) {
function doTheRest() {
uponPromise(
action(),
() => finalize(originalIsError, originalError),
(newError) => finalize(true, newError),
);
}
if (shuttingDown === true) {
return;
}
shuttingDown = true;
if (
dest[_state] === "writable" &&
writableStreamCloseQueuedOrInFlight(dest) === false
) {
uponFulfillment(waitForWritesToFinish(), doTheRest);
} else {
doTheRest();
}
}
/**
* @param {boolean=} isError
* @param {any=} error
*/
function shutdown(isError, error) {
if (shuttingDown) {
return;
}
shuttingDown = true;
if (
dest[_state] === "writable" &&
writableStreamCloseQueuedOrInFlight(dest) === false
) {
uponFulfillment(
waitForWritesToFinish(),
() => finalize(isError, error),
);
} else {
finalize(isError, error);
}
}
/**
* @param {boolean=} isError
* @param {any=} error
*/
function finalize(isError, error) {
writableStreamDefaultWriterRelease(writer);
readableStreamReaderGenericRelease(reader);
if (signal !== undefined) {
signal.removeEventListener("abort", abortAlgorithm);
}
if (isError) {
promise.reject(error);
} else {
promise.resolve(undefined);
}
}
}
/**
* @param {ReadableStreamGenericReader} reader
* @param {any} reason
* @returns {Promise}
*/
function readableStreamReaderGenericCancel(reader, reason) {
const stream = reader[_stream];
assert(stream !== undefined);
return readableStreamCancel(stream, reason);
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
* @param {ReadableStream} stream
*/
function readableStreamReaderGenericInitialize(reader, stream) {
reader[_stream] = stream;
stream[_reader] = reader;
if (stream[_state] === "readable") {
reader[_closedPromise] = new Deferred();
} else if (stream[_state] === "closed") {
reader[_closedPromise] = new Deferred();
reader[_closedPromise].resolve(undefined);
} else {
assert(stream[_state] === "errored");
reader[_closedPromise] = new Deferred();
reader[_closedPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(reader[_closedPromise].promise);
}
}
/**
* @template R
* @param {ReadableStreamGenericReader} reader
*/
function readableStreamReaderGenericRelease(reader) {
assert(reader[_stream] !== undefined);
assert(reader[_stream][_reader] === reader);
if (reader[_stream][_state] === "readable") {
reader[_closedPromise].reject(
new TypeError(
"Reader was released and can no longer be used to monitor the stream's closedness.",
),
);
} else {
reader[_closedPromise] = new Deferred();
reader[_closedPromise].reject(
new TypeError(
"Reader was released and can no longer be used to monitor the stream's closedness.",
),
);
}
setPromiseIsHandledToTrue(reader[_closedPromise].promise);
reader[_stream][_reader] = undefined;
reader[_stream] = undefined;
}
/**
* @template R
* @param {ReadableStream} stream
* @param {boolean} cloneForBranch2
* @returns {[ReadableStream, ReadableStream]}
*/
function readableStreamTee(stream, cloneForBranch2) {
assert(isReadableStream(stream));
assert(typeof cloneForBranch2 === "boolean");
const reader = acquireReadableStreamDefaultReader(stream);
let reading = false;
let canceled1 = false;
let canceled2 = false;
/** @type {any} */
let reason1;
/** @type {any} */
let reason2;
/** @type {ReadableStream} */
// deno-lint-ignore prefer-const
let branch1;
/** @type {ReadableStream} */
// deno-lint-ignore prefer-const
let branch2;
/** @type {Deferred} */
const cancelPromise = new Deferred();
function pullAlgorithm() {
if (reading === true) {
return resolvePromiseWith(undefined);
}
reading = true;
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(value) {
queueMicrotask(() => {
reading = false;
const value1 = value;
const value2 = value;
if (canceled1 === false) {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ (branch1[
_controller
]),
value1,
);
}
if (canceled2 === false) {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ (branch2[
_controller
]),
value2,
);
}
});
},
closeSteps() {
reading = false;
if (canceled1 === false) {
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ (branch1[
_controller
]),
);
}
if (canceled2 === false) {
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ (branch2[
_controller
]),
);
}
cancelPromise.resolve(undefined);
},
errorSteps() {
reading = false;
},
};
readableStreamDefaultReaderRead(reader, readRequest);
return resolvePromiseWith(undefined);
}
/**
* @param {any} reason
* @returns {Promise}
*/
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2 === true) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
/**
* @param {any} reason
* @returns {Promise}
*/
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1 === true) {
const compositeReason = [reason1, reason2];
const cancelResult = readableStreamCancel(stream, compositeReason);
cancelPromise.resolve(cancelResult);
}
return cancelPromise.promise;
}
function startAlgorithm() {}
branch1 = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancel1Algorithm,
);
branch2 = createReadableStream(
startAlgorithm,
pullAlgorithm,
cancel2Algorithm,
);
uponRejection(reader[_closedPromise].promise, (r) => {
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ (branch1[
_controller
]),
r,
);
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ (branch2[
_controller
]),
r,
);
cancelPromise.resolve(undefined);
});
return [branch1, branch2];
}
/**
* @param {ReadableStream} stream
* @param {ReadableByteStreamController} controller
* @param {() => void} startAlgorithm
* @param {() => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number} highWaterMark
* @param {number | undefined} autoAllocateChunkSize
*/
function setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
autoAllocateChunkSize,
) {
assert(stream[_controller] === undefined);
if (autoAllocateChunkSize !== undefined) {
assert(Number.isInteger(autoAllocateChunkSize));
assert(autoAllocateChunkSize >= 0);
}
controller[_stream] = stream;
controller[_pullAgain] = controller[_pulling] = false;
controller[_byobRequest] = undefined;
resetQueue(controller);
controller[_closeRequested] = controller[_started] = false;
controller[_strategyHWM] = highWaterMark;
controller[_pullAlgorithm] = pullAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
controller[_autoAllocateChunkSize] = autoAllocateChunkSize;
// 12. Set controller.[[pendingPullIntos]] to a new empty list.
stream[_controller] = controller;
const startResult = startAlgorithm();
const startPromise = resolvePromiseWith(startResult);
setPromiseIsHandledToTrue(
startPromise.then(
() => {
controller[_started] = true;
assert(controller[_pulling] === false);
assert(controller[_pullAgain] === false);
readableByteStreamControllerCallPullIfNeeded(controller);
},
(r) => {
readableByteStreamControllerError(controller, r);
},
),
);
}
/**
* @param {ReadableStream} stream
* @param {UnderlyingSource} underlyingSource
* @param {UnderlyingSource} underlyingSourceDict
* @param {number} highWaterMark
*/
function setUpReadableByteStreamControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSourceDict,
highWaterMark,
) {
const controller = new ReadableByteStreamController();
/** @type {() => void} */
let startAlgorithm = () => undefined;
/** @type {() => Promise} */
let pullAlgorithm = () => resolvePromiseWith(undefined);
/** @type {(reason: any) => Promise} */
let cancelAlgorithm = (_reason) => resolvePromiseWith(undefined);
if ("start" in underlyingSourceDict) {
startAlgorithm = () =>
underlyingSourceDict.start.call(underlyingSource, controller);
}
if ("pull" in underlyingSourceDict) {
pullAlgorithm = () =>
underlyingSourceDict.pull.call(underlyingSource, controller);
}
if ("cancel" in underlyingSourceDict) {
cancelAlgorithm = (reason) =>
underlyingSourceDict.cancel.call(underlyingSource, reason);
}
// 3.13.27.6 Let autoAllocateChunkSize be ? GetV(underlyingByteSource, "autoAllocateChunkSize").
/** @type {undefined} */
const autoAllocateChunkSize = undefined;
setUpReadableByteStreamController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
autoAllocateChunkSize,
);
}
/**
* @template R
* @param {ReadableStream} stream
* @param {ReadableStreamDefaultController} controller
* @param {(controller: ReadableStreamDefaultController) => void | Promise} startAlgorithm
* @param {(controller: ReadableStreamDefaultController) => Promise} pullAlgorithm
* @param {(reason: any) => Promise} cancelAlgorithm
* @param {number} highWaterMark
* @param {(chunk: R) => number} sizeAlgorithm
*/
function setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(stream[_controller] === undefined);
controller[_stream] = stream;
resetQueue(controller);
controller[_started] = controller[_closeRequested] =
controller[_pullAgain] = controller[_pulling] = false;
controller[_strategySizeAlgorithm] = sizeAlgorithm;
controller[_strategyHWM] = highWaterMark;
controller[_pullAlgorithm] = pullAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
stream[_controller] = controller;
const startResult = startAlgorithm(controller);
const startPromise = resolvePromiseWith(startResult);
uponPromise(startPromise, () => {
controller[_started] = true;
assert(controller[_pulling] === false);
assert(controller[_pullAgain] === false);
readableStreamDefaultControllerCallPullIfNeeded(controller);
}, (r) => {
readableStreamDefaultControllerError(controller, r);
});
}
/**
* @template R
* @param {ReadableStream} stream
* @param {UnderlyingSource} underlyingSource
* @param {UnderlyingSource} underlyingSourceDict
* @param {number} highWaterMark
* @param {(chunk: R) => number} sizeAlgorithm
*/
function setUpReadableStreamDefaultControllerFromUnderlyingSource(
stream,
underlyingSource,
underlyingSourceDict,
highWaterMark,
sizeAlgorithm,
) {
const controller = new ReadableStreamDefaultController();
/** @type {(controller: ReadableStreamDefaultController) => Promise} */
let startAlgorithm = () => undefined;
/** @type {(controller: ReadableStreamDefaultController) => Promise} */
let pullAlgorithm = () => resolvePromiseWith(undefined);
/** @type {(reason?: any) => Promise} */
let cancelAlgorithm = () => resolvePromiseWith(undefined);
if ("start" in underlyingSourceDict) {
startAlgorithm = () =>
underlyingSourceDict.start.call(underlyingSource, controller);
}
if ("pull" in underlyingSourceDict) {
pullAlgorithm = () =>
underlyingSourceDict.pull.call(underlyingSource, controller);
}
if ("cancel" in underlyingSourceDict) {
cancelAlgorithm = (reason) =>
underlyingSourceDict.cancel.call(underlyingSource, reason);
}
setUpReadableStreamDefaultController(
stream,
controller,
startAlgorithm,
pullAlgorithm,
cancelAlgorithm,
highWaterMark,
sizeAlgorithm,
);
}
/**
* @template R
* @param {ReadableStreamDefaultReader} reader
* @param {ReadableStream} stream
*/
function setUpReadableStreamDefaultReader(reader, stream) {
if (isReadableStreamLocked(stream)) {
throw new TypeError("ReadableStream is locked.");
}
readableStreamReaderGenericInitialize(reader, stream);
reader[_readRequests] = [];
}
/**
* @template O
* @param {TransformStream} stream
* @param {TransformStreamDefaultController} controller
* @param {(chunk: O, controller: TransformStreamDefaultController) => Promise} transformAlgorithm
* @param {(controller: TransformStreamDefaultController) => Promise} flushAlgorithm
*/
function setUpTransformStreamDefaultController(
stream,
controller,
transformAlgorithm,
flushAlgorithm,
) {
assert(stream instanceof TransformStream);
assert(stream[_controller] === undefined);
controller[_stream] = stream;
stream[_controller] = controller;
controller[_transformAlgorithm] = transformAlgorithm;
controller[_flushAlgorithm] = flushAlgorithm;
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {Transformer} transformer
* @param {Transformer} transformerDict
*/
function setUpTransformStreamDefaultControllerFromTransformer(
stream,
transformer,
transformerDict,
) {
/** @type {TransformStreamDefaultController} */
const controller = new TransformStreamDefaultController();
/** @type {(chunk: O, controller: TransformStreamDefaultController) => Promise} */
let transformAlgorithm = (chunk) => {
try {
transformStreamDefaultControllerEnqueue(controller, chunk);
} catch (e) {
return Promise.reject(e);
}
return resolvePromiseWith(undefined);
};
/** @type {(controller: TransformStreamDefaultController) => Promise} */
let flushAlgorithm = () => resolvePromiseWith(undefined);
if ("transform" in transformerDict) {
transformAlgorithm = (chunk, controller) =>
transformerDict.transform.call(transformer, chunk, controller);
}
if ("flush" in transformerDict) {
flushAlgorithm = (controller) =>
transformerDict.flush.call(transformer, controller);
}
setUpTransformStreamDefaultController(
stream,
controller,
transformAlgorithm,
flushAlgorithm,
);
}
/**
* @template W
* @param {WritableStream} stream
* @param {WritableStreamDefaultController} controller
* @param {(controller: WritableStreamDefaultController) => Promise} startAlgorithm
* @param {(chunk: W, controller: WritableStreamDefaultController) => Promise} writeAlgorithm
* @param {() => Promise} closeAlgorithm
* @param {(reason?: any) => Promise} abortAlgorithm
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
*/
function setUpWritableStreamDefaultController(
stream,
controller,
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
) {
assert(isWritableStream(stream));
assert(stream[_controller] === undefined);
controller[_stream] = stream;
stream[_controller] = controller;
resetQueue(controller);
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(controller);
const startPromise = resolvePromiseWith(startResult);
uponPromise(startPromise, () => {
assert(stream[_state] === "writable" || stream[_state] === "erroring");
controller[_started] = true;
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, (r) => {
assert(stream[_state] === "writable" || stream[_state] === "erroring");
controller[_started] = true;
writableStreamDealWithRejection(stream, r);
});
}
/**
* @template W
* @param {WritableStream} stream
* @param {UnderlyingSink} underlyingSink
* @param {UnderlyingSink} underlyingSinkDict
* @param {number} highWaterMark
* @param {(chunk: W) => number} sizeAlgorithm
*/
function setUpWritableStreamDefaultControllerFromUnderlyingSink(
stream,
underlyingSink,
underlyingSinkDict,
highWaterMark,
sizeAlgorithm,
) {
const controller = new WritableStreamDefaultController();
let startAlgorithm = () => undefined;
/** @type {(chunk: W) => Promise} */
let writeAlgorithm = () => resolvePromiseWith(undefined);
let closeAlgorithm = () => resolvePromiseWith(undefined);
/** @type {(reason?: any) => Promise} */
let abortAlgorithm = () => resolvePromiseWith(undefined);
if ("start" in underlyingSinkDict) {
startAlgorithm = () =>
underlyingSinkDict.start.call(underlyingSink, controller);
}
if ("write" in underlyingSinkDict) {
writeAlgorithm = (chunk) =>
underlyingSinkDict.write.call(underlyingSink, chunk, controller);
}
if ("close" in underlyingSinkDict) {
closeAlgorithm = () => underlyingSinkDict.close.call(underlyingSink);
}
if ("abort" in underlyingSinkDict) {
abortAlgorithm = (reason) =>
underlyingSinkDict.abort.call(underlyingSink, reason);
}
setUpWritableStreamDefaultController(
stream,
controller,
startAlgorithm,
writeAlgorithm,
closeAlgorithm,
abortAlgorithm,
highWaterMark,
sizeAlgorithm,
);
}
/**
* @template W
* @param {WritableStreamDefaultWriter} writer
* @param {WritableStream} stream
*/
function setUpWritableStreamDefaultWriter(writer, stream) {
if (isWritableStreamLocked(stream) === true) {
throw new TypeError("The stream is already locked.");
}
writer[_stream] = stream;
stream[_writer] = writer;
const state = stream[_state];
if (state === "writable") {
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
stream[_backpressure] === true
) {
writer[_readyPromise] = new Deferred();
} else {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].resolve(undefined);
}
writer[_closedPromise] = new Deferred();
} else if (state === "erroring") {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
writer[_closedPromise] = new Deferred();
} else if (state === "closed") {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].resolve(undefined);
writer[_closedPromise] = new Deferred();
writer[_closedPromise].resolve(undefined);
} else {
assert(state === "errored");
const storedError = stream[_storedError];
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(storedError);
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
writer[_closedPromise] = new Deferred();
writer[_closedPromise].reject(storedError);
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
}
/** @param {TransformStreamDefaultController} controller */
function transformStreamDefaultControllerClearAlgorithms(controller) {
controller[_transformAlgorithm] = undefined;
controller[_flushAlgorithm] = undefined;
}
/**
* @template O
* @param {TransformStreamDefaultController} controller
* @param {O} chunk
*/
function transformStreamDefaultControllerEnqueue(controller, chunk) {
const stream = controller[_stream];
const readableController = stream[_readable][_controller];
if (
readableStreamDefaultControllerCanCloseOrEnqueue(
/** @type {ReadableStreamDefaultController} */ (readableController),
) === false
) {
throw new TypeError("Readable stream is unavailable.");
}
try {
readableStreamDefaultControllerEnqueue(
/** @type {ReadableStreamDefaultController} */ (readableController),
chunk,
);
} catch (e) {
transformStreamErrorWritableAndUnblockWrite(stream, e);
throw stream[_readable][_storedError];
}
const backpressure = readableStreamDefaultcontrollerHasBackpressure(
/** @type {ReadableStreamDefaultController} */ (readableController),
);
if (backpressure !== stream[_backpressure]) {
assert(backpressure === true);
transformStreamSetBackpressure(stream, true);
}
}
/**
* @param {TransformStreamDefaultController} controller
* @param {any=} e
*/
function transformStreamDefaultControllerError(controller, e) {
transformStreamError(controller[_stream], e);
}
/**
* @template O
* @param {TransformStreamDefaultController} controller
* @param {any} chunk
* @returns {Promise}
*/
function transformStreamDefaultControllerPerformTransform(controller, chunk) {
const transformPromise = controller[_transformAlgorithm](chunk, controller);
return transformPromiseWith(transformPromise, undefined, (r) => {
transformStreamError(controller[_stream], r);
throw r;
});
}
/** @param {TransformStreamDefaultController} controller */
function transformStreamDefaultControllerTerminate(controller) {
const stream = controller[_stream];
const readableController = stream[_readable][_controller];
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ (readableController),
);
const error = new TypeError("The stream has been terminated.");
transformStreamErrorWritableAndUnblockWrite(stream, error);
}
/**
* @param {TransformStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function transformStreamDefaultSinkAbortAlgorithm(stream, reason) {
transformStreamError(stream, reason);
return resolvePromiseWith(undefined);
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @returns {Promise}
*/
function transformStreamDefaultSinkCloseAlgorithm(stream) {
const readable = stream[_readable];
const controller = stream[_controller];
const flushPromise = controller[_flushAlgorithm](controller);
transformStreamDefaultControllerClearAlgorithms(controller);
return transformPromiseWith(flushPromise, () => {
if (readable[_state] === "errored") {
throw readable[_storedError];
}
readableStreamDefaultControllerClose(
/** @type {ReadableStreamDefaultController} */ (readable[_controller]),
);
}, (r) => {
transformStreamError(stream, r);
throw readable[_storedError];
});
}
/**
* @template I
* @template O
* @param {TransformStream} stream
* @param {I} chunk
* @returns {Promise}
*/
function transformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
assert(stream[_writable][_state] === "writable");
const controller = stream[_controller];
if (stream[_backpressure] === true) {
const backpressureChangePromise = stream[_backpressureChangePromise];
assert(backpressureChangePromise !== undefined);
return transformPromiseWith(backpressureChangePromise.promise, () => {
const writable = stream[_writable];
const state = writable[_state];
if (state === "erroring") {
throw writable[_storedError];
}
assert(state === "writable");
return transformStreamDefaultControllerPerformTransform(
controller,
chunk,
);
});
}
return transformStreamDefaultControllerPerformTransform(controller, chunk);
}
/**
* @param {TransformStream} stream
* @returns {Promise}
*/
function transformStreamDefaultSourcePullAlgorithm(stream) {
assert(stream[_backpressure] === true);
assert(stream[_backpressureChangePromise] !== undefined);
transformStreamSetBackpressure(stream, false);
return stream[_backpressureChangePromise].promise;
}
/**
* @param {TransformStream} stream
* @param {any=} e
*/
function transformStreamError(stream, e) {
readableStreamDefaultControllerError(
/** @type {ReadableStreamDefaultController} */ (stream[_readable][
_controller
]),
e,
);
transformStreamErrorWritableAndUnblockWrite(stream, e);
}
/**
* @param {TransformStream} stream
* @param {any=} e
*/
function transformStreamErrorWritableAndUnblockWrite(stream, e) {
transformStreamDefaultControllerClearAlgorithms(stream[_controller]);
writableStreamDefaultControllerErrorIfNeeded(
stream[_writable][_controller],
e,
);
if (stream[_backpressure] === true) {
transformStreamSetBackpressure(stream, false);
}
}
/**
* @param {TransformStream} stream
* @param {boolean} backpressure
*/
function transformStreamSetBackpressure(stream, backpressure) {
assert(stream[_backpressure] !== backpressure);
if (stream[_backpressureChangePromise] !== undefined) {
stream[_backpressureChangePromise].resolve(undefined);
}
stream[_backpressureChangePromise] = new Deferred();
stream[_backpressure] = backpressure;
}
/**
* @param {WritableStream} stream
* @param {any=} reason
* @returns {Promise}
*/
function writableStreamAbort(stream, reason) {
const state = stream[_state];
if (state === "closed" || state === "errored") {
return resolvePromiseWith(undefined);
}
if (stream[_pendingAbortRequest] !== undefined) {
return stream[_pendingAbortRequest].deferred.promise;
}
assert(state === "writable" || state === "erroring");
let wasAlreadyErroring = false;
if (state === "erroring") {
wasAlreadyErroring = true;
reason = undefined;
}
/** Deferred */
const deferred = new Deferred();
stream[_pendingAbortRequest] = {
deferred,
reason,
wasAlreadyErroring,
};
if (wasAlreadyErroring === false) {
writableStreamStartErroring(stream, reason);
}
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {Promise}
*/
function writableStreamAddWriteRequest(stream) {
assert(isWritableStreamLocked(stream) === true);
assert(stream[_state] === "writable");
/** @type {Deferred} */
const deferred = new Deferred();
stream[_writeRequests].push(deferred);
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {Promise}
*/
function writableStreamClose(stream) {
const state = stream[_state];
if (state === "closed" || state === "errored") {
return Promise.reject(
new TypeError("Writable stream is closed or errored."),
);
}
assert(state === "writable" || state === "erroring");
assert(writableStreamCloseQueuedOrInFlight(stream) === false);
/** @type {Deferred} */
const deferred = new Deferred();
stream[_closeRequest] = deferred;
const writer = stream[_writer];
if (
writer !== undefined && stream[_backpressure] === true &&
state === "writable"
) {
writer[_readyPromise].resolve(undefined);
}
writableStreamDefaultControllerClose(stream[_controller]);
return deferred.promise;
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function writableStreamCloseQueuedOrInFlight(stream) {
if (
stream[_closeRequest] === undefined &&
stream[_inFlightCloseRequest] === undefined
) {
return false;
}
return true;
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamDealWithRejection(stream, error) {
const state = stream[_state];
if (state === "writable") {
writableStreamStartErroring(stream, error);
return;
}
assert(state === "erroring");
writableStreamFinishErroring(stream);
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
*/
function writableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
const stream = controller[_stream];
if (controller[_started] === false) {
return;
}
if (stream[_inFlightWriteRequest] !== undefined) {
return;
}
const state = stream[_state];
assert(state !== "closed" && state !== "errored");
if (state === "erroring") {
writableStreamFinishErroring(stream);
return;
}
if (controller[_queue].length === 0) {
return;
}
const value = peekQueueValue(controller);
if (value === _close) {
writableStreamDefaultControllerProcessClose(controller);
} else {
writableStreamDefaultControllerProcessWrite(controller, value);
}
}
function writableStreamDefaultControllerClearAlgorithms(controller) {
controller[_writeAlgorithm] = undefined;
controller[_closeAlgorithm] = undefined;
controller[_abortAlgorithm] = undefined;
controller[_strategySizeAlgorithm] = undefined;
}
/** @param {WritableStreamDefaultController} controller */
function writableStreamDefaultControllerClose(controller) {
enqueueValueWithSize(controller, _close, 0);
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
/**
* @param {WritableStreamDefaultController} controller
* @param {any} error
*/
function writableStreamDefaultControllerError(controller, error) {
const stream = controller[_stream];
assert(stream[_state] === "writable");
writableStreamDefaultControllerClearAlgorithms(controller);
writableStreamStartErroring(stream, error);
}
/**
* @param {WritableStreamDefaultController} controller
* @param {any} error
*/
function writableStreamDefaultControllerErrorIfNeeded(controller, error) {
if (controller[_stream][_state] === "writable") {
writableStreamDefaultControllerError(controller, error);
}
}
/**
* @param {WritableStreamDefaultController} controller
* @returns {boolean}
*/
function writableStreamDefaultControllerGetBackpressure(controller) {
const desiredSize = writableStreamDefaultControllerGetDesiredSize(
controller,
);
return desiredSize <= 0;
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
* @returns {number}
*/
function writableStreamDefaultControllerGetChunkSize(controller, chunk) {
let value;
try {
value = controller[_strategySizeAlgorithm](chunk);
} catch (e) {
writableStreamDefaultControllerErrorIfNeeded(controller, e);
return 1;
}
return value;
}
/**
* @param {WritableStreamDefaultController} controller
* @returns {number}
*/
function writableStreamDefaultControllerGetDesiredSize(controller) {
return controller[_strategyHWM] - controller[_queueTotalSize];
}
/** @param {WritableStreamDefaultController} controller */
function writableStreamDefaultControllerProcessClose(controller) {
const stream = controller[_stream];
writableStreamMarkCloseRequestInFlight(stream);
dequeueValue(controller);
assert(controller[_queue].length === 0);
const sinkClosePromise = controller[_closeAlgorithm]();
writableStreamDefaultControllerClearAlgorithms(controller);
uponPromise(sinkClosePromise, () => {
writableStreamFinishInFlightClose(stream);
}, (reason) => {
writableStreamFinishInFlightCloseWithError(stream, reason);
});
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
*/
function writableStreamDefaultControllerProcessWrite(controller, chunk) {
const stream = controller[_stream];
writableStreamMarkFirstWriteRequestInFlight(stream);
const sinkWritePromise = controller[_writeAlgorithm](chunk, controller);
uponPromise(sinkWritePromise, () => {
writableStreamFinishInFlightWrite(stream);
const state = stream[_state];
assert(state === "writable" || state === "erroring");
dequeueValue(controller);
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
state === "writable"
) {
const backpressure = writableStreamDefaultControllerGetBackpressure(
controller,
);
writableStreamUpdateBackpressure(stream, backpressure);
}
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}, (reason) => {
if (stream[_state] === "writable") {
writableStreamDefaultControllerClearAlgorithms(controller);
}
writableStreamFinishInFlightWriteWithError(stream, reason);
});
}
/**
* @template W
* @param {WritableStreamDefaultController} controller
* @param {W} chunk
* @param {number} chunkSize
*/
function writableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
try {
enqueueValueWithSize(controller, chunk, chunkSize);
} catch (e) {
writableStreamDefaultControllerErrorIfNeeded(controller, e);
return;
}
const stream = controller[_stream];
if (
writableStreamCloseQueuedOrInFlight(stream) === false &&
stream[_state] === "writable"
) {
const backpressure = writableStreamDefaultControllerGetBackpressure(
controller,
);
writableStreamUpdateBackpressure(stream, backpressure);
}
writableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} reason
* @returns {Promise}
*/
function writableStreamDefaultWriterAbort(writer, reason) {
const stream = writer[_stream];
assert(stream !== undefined);
return writableStreamAbort(stream, reason);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {Promise}
*/
function writableStreamDefaultWriterClose(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
return writableStreamClose(stream);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {Promise}
*/
function writableStreamDefaultWriterCloseWithErrorPropagation(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
const state = stream[_state];
if (
writableStreamCloseQueuedOrInFlight(stream) === true || state === "closed"
) {
return resolvePromiseWith(undefined);
}
if (state === "errored") {
return Promise.reject(stream[_storedError]);
}
assert(state === "writable" || state === "erroring");
return writableStreamDefaultWriterClose(writer);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} error
*/
function writableStreamDefaultWriterEnsureClosedPromiseRejected(
writer,
error,
) {
if (writer[_closedPromise].state === "pending") {
writer[_closedPromise].reject(error);
} else {
writer[_closedPromise] = new Deferred();
writer[_closedPromise].reject(error);
}
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @param {any=} error
*/
function writableStreamDefaultWriterEnsureReadyPromiseRejected(
writer,
error,
) {
if (writer[_readyPromise].state === "pending") {
writer[_readyPromise].reject(error);
} else {
writer[_readyPromise] = new Deferred();
writer[_readyPromise].reject(error);
}
setPromiseIsHandledToTrue(writer[_readyPromise].promise);
}
/**
* @param {WritableStreamDefaultWriter} writer
* @returns {number | null}
*/
function writableStreamDefaultWriterGetDesiredSize(writer) {
const stream = writer[_stream];
const state = stream[_state];
if (state === "errored" || state === "erroring") {
return null;
}
if (state === "closed") {
return 0;
}
return writableStreamDefaultControllerGetDesiredSize(stream[_controller]);
}
/** @param {WritableStreamDefaultWriter} writer */
function writableStreamDefaultWriterRelease(writer) {
const stream = writer[_stream];
assert(stream !== undefined);
assert(stream[_writer] === writer);
const releasedError = new TypeError(
"The writer has already been released.",
);
writableStreamDefaultWriterEnsureReadyPromiseRejected(
writer,
releasedError,
);
writableStreamDefaultWriterEnsureClosedPromiseRejected(
writer,
releasedError,
);
stream[_writer] = undefined;
writer[_stream] = undefined;
}
/**
* @template W
* @param {WritableStreamDefaultWriter} writer
* @param {W} chunk
* @returns {Promise}
*/
function writableStreamDefaultWriterWrite(writer, chunk) {
const stream = writer[_stream];
assert(stream !== undefined);
const controller = stream[_controller];
const chunkSize = writableStreamDefaultControllerGetChunkSize(
controller,
chunk,
);
if (stream !== writer[_stream]) {
return Promise.reject(new TypeError("Writer's stream is unexpected."));
}
const state = stream[_state];
if (state === "errored") {
return Promise.reject(stream[_storedError]);
}
if (
writableStreamCloseQueuedOrInFlight(stream) === true || state === "closed"
) {
return Promise.reject(
new TypeError("The stream is closing or is closed."),
);
}
if (state === "erroring") {
return Promise.reject(stream[_storedError]);
}
assert(state === "writable");
const promise = writableStreamAddWriteRequest(stream);
writableStreamDefaultControllerWrite(controller, chunk, chunkSize);
return promise;
}
/** @param {WritableStream} stream */
function writableStreamFinishErroring(stream) {
assert(stream[_state] === "erroring");
assert(writableStreamHasOperationMarkedInFlight(stream) === false);
stream[_state] = "errored";
stream[_controller][_errorSteps]();
const storedError = stream[_storedError];
for (const writeRequest of stream[_writeRequests]) {
writeRequest.reject(storedError);
}
stream[_writeRequests] = [];
if (stream[_pendingAbortRequest] === undefined) {
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const abortRequest = stream[_pendingAbortRequest];
stream[_pendingAbortRequest] = undefined;
if (abortRequest.wasAlreadyErroring === true) {
abortRequest.deferred.reject(storedError);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const promise = stream[_controller][_abortSteps](abortRequest.reason);
uponPromise(promise, () => {
abortRequest.deferred.resolve(undefined);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
}, (reason) => {
abortRequest.deferred.reject(reason);
writableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
});
}
/** @param {WritableStream} stream */
function writableStreamFinishInFlightClose(stream) {
assert(stream[_inFlightCloseRequest] !== undefined);
stream[_inFlightCloseRequest].resolve(undefined);
stream[_inFlightCloseRequest] = undefined;
const state = stream[_state];
assert(state === "writable" || state === "erroring");
if (state === "erroring") {
stream[_storedError] = undefined;
if (stream[_pendingAbortRequest] !== undefined) {
stream[_pendingAbortRequest].deferred.resolve(undefined);
stream[_pendingAbortRequest] = undefined;
}
}
stream[_state] = "closed";
const writer = stream[_writer];
if (writer !== undefined) {
writer[_closedPromise].resolve(undefined);
}
assert(stream[_pendingAbortRequest] === undefined);
assert(stream[_storedError] === undefined);
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamFinishInFlightCloseWithError(stream, error) {
assert(stream[_inFlightCloseRequest] !== undefined);
stream[_inFlightCloseRequest].reject(error);
stream[_inFlightCloseRequest] = undefined;
assert(stream[_state] === "writable" || stream[_state] === "erroring");
if (stream[_pendingAbortRequest] !== undefined) {
stream[_pendingAbortRequest].deferred.reject(error);
stream[_pendingAbortRequest] = undefined;
}
writableStreamDealWithRejection(stream, error);
}
/** @param {WritableStream} stream */
function writableStreamFinishInFlightWrite(stream) {
assert(stream[_inFlightWriteRequest] !== undefined);
stream[_inFlightWriteRequest].resolve(undefined);
stream[_inFlightWriteRequest] = undefined;
}
/**
* @param {WritableStream} stream
* @param {any=} error
*/
function writableStreamFinishInFlightWriteWithError(stream, error) {
assert(stream[_inFlightWriteRequest] !== undefined);
stream[_inFlightWriteRequest].reject(error);
stream[_inFlightWriteRequest] = undefined;
assert(stream[_state] === "writable" || stream[_state] === "erroring");
writableStreamDealWithRejection(stream, error);
}
/**
* @param {WritableStream} stream
* @returns {boolean}
*/
function writableStreamHasOperationMarkedInFlight(stream) {
if (
stream[_inFlightWriteRequest] === undefined &&
stream[_controller][_inFlightCloseRequest] === undefined
) {
return false;
}
return true;
}
/** @param {WritableStream} stream */
function writableStreamMarkCloseRequestInFlight(stream) {
assert(stream[_inFlightCloseRequest] === undefined);
assert(stream[_closeRequest] !== undefined);
stream[_inFlightCloseRequest] = stream[_closeRequest];
stream[_closeRequest] = undefined;
}
/**
* @template W
* @param {WritableStream} stream
* */
function writableStreamMarkFirstWriteRequestInFlight(stream) {
assert(stream[_inFlightWriteRequest] === undefined);
assert(stream[_writeRequests].length);
const writeRequest = stream[_writeRequests].shift();
stream[_inFlightWriteRequest] = writeRequest;
}
/** @param {WritableStream} stream */
function writableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
assert(stream[_state] === "errored");
if (stream[_closeRequest] !== undefined) {
assert(stream[_inFlightCloseRequest] === undefined);
stream[_closeRequest].reject(stream[_storedError]);
stream[_closeRequest] = undefined;
}
const writer = stream[_writer];
if (writer !== undefined) {
writer[_closedPromise].reject(stream[_storedError]);
setPromiseIsHandledToTrue(writer[_closedPromise].promise);
}
}
/**
* @param {WritableStream} stream
* @param {any=} reason
*/
function writableStreamStartErroring(stream, reason) {
assert(stream[_storedError] === undefined);
assert(stream[_state] === "writable");
const controller = stream[_controller];
assert(controller);
stream[_state] = "erroring";
stream[_storedError] = reason;
const writer = stream[_writer];
if (writer) {
writableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
}
if (
writableStreamHasOperationMarkedInFlight(stream) === false &&
controller[_started] === true
) {
writableStreamFinishErroring(stream);
}
}
/**
* @param {WritableStream} stream
* @param {boolean} backpressure
*/
function writableStreamUpdateBackpressure(stream, backpressure) {
assert(stream[_state] === "writable");
assert(writableStreamCloseQueuedOrInFlight(stream) === false);
const writer = stream[_writer];
if (writer !== undefined && backpressure !== stream[_backpressure]) {
if (backpressure === true) {
writer[_readyPromise] = new Deferred();
} else {
assert(backpressure === false);
writer[_readyPromise].resolve(undefined);
}
}
stream[_backpressure] = backpressure;
}
/**
* @template T
* @param {T} value
* @param {boolean} done
* @returns {IteratorResult}
*/
function createIteratorResult(value, done) {
const result = Object.create(null);
Object.defineProperties(result, {
value: { value, writable: true, enumerable: true, configurable: true },
done: {
value: done,
writable: true,
enumerable: true,
configurable: true,
},
});
return result;
}
/** @type {AsyncIterator} */
const asyncIteratorPrototype = Object.getPrototypeOf(
Object.getPrototypeOf(async function* () {}).prototype,
);
/** @type {AsyncIterator} */
const readableStreamAsyncIteratorPrototype = Object.setPrototypeOf({
/** @returns {Promise>} */
next() {
/** @type {ReadableStreamDefaultReader} */
const reader = this[_reader];
if (reader[_stream] === undefined) {
return Promise.reject(
new TypeError(
"Cannot get the next iteration result once the reader has been released.",
),
);
}
/** @type {Deferred>} */
const promise = new Deferred();
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(chunk) {
promise.resolve(createIteratorResult(chunk, false));
},
closeSteps() {
readableStreamReaderGenericRelease(reader);
promise.resolve(createIteratorResult(undefined, true));
},
errorSteps(e) {
readableStreamReaderGenericRelease(reader);
promise.reject(e);
},
};
readableStreamDefaultReaderRead(reader, readRequest);
return promise.promise;
},
/**
* @param {unknown} arg
* @returns {Promise>}
*/
async return(arg) {
/** @type {ReadableStreamDefaultReader} */
const reader = this[_reader];
if (reader[_stream] === undefined) {
return createIteratorResult(undefined, true);
}
assert(reader[_readRequests].length === 0);
if (this[_preventCancel] === false) {
const result = readableStreamReaderGenericCancel(reader, arg);
readableStreamReaderGenericRelease(reader);
await result;
return createIteratorResult(arg, true);
}
readableStreamReaderGenericRelease(reader);
return createIteratorResult(undefined, true);
},
}, asyncIteratorPrototype);
class ByteLengthQueuingStrategy {
/** @type {number} */
highWaterMark;
/** @param {{ highWaterMark: number }} init */
constructor(init) {
if (
typeof init !== "object" || init === null || !("highWaterMark" in init)
) {
throw new TypeError(
"init must be an object that contains a property named highWaterMark",
);
}
const { highWaterMark } = init;
this[_globalObject] = window;
this.highWaterMark = Number(highWaterMark);
}
/** @returns {(chunk: ArrayBufferView) => number} */
get size() {
initializeByteLengthSizeFunction(this[_globalObject]);
return byteSizeFunctionWeakMap.get(this[_globalObject]);
}
}
/** @type {WeakMap number>} */
const byteSizeFunctionWeakMap = new WeakMap();
function initializeByteLengthSizeFunction(globalObject) {
if (byteSizeFunctionWeakMap.has(globalObject)) {
return;
}
byteSizeFunctionWeakMap.set(globalObject, function size(chunk) {
return chunk.byteLength;
});
}
class CountQueuingStrategy {
/** @type {number} */
highWaterMark;
/** @param {{ highWaterMark: number }} init */
constructor(init) {
if (
typeof init !== "object" || init === null || !("highWaterMark" in init)
) {
throw new TypeError(
"init must be an object that contains a property named highWaterMark",
);
}
const { highWaterMark } = init;
this[_globalObject] = window;
this.highWaterMark = Number(highWaterMark);
}
/** @returns {(chunk: any) => 1} */
get size() {
initializeCountSizeFunction(this[_globalObject]);
return countSizeFunctionWeakMap.get(this[_globalObject]);
}
}
/** @type {WeakMap 1>} */
const countSizeFunctionWeakMap = new WeakMap();
/** @param {typeof globalThis} globalObject */
function initializeCountSizeFunction(globalObject) {
if (countSizeFunctionWeakMap.has(globalObject)) {
return;
}
countSizeFunctionWeakMap.set(globalObject, function size() {
return 1;
});
}
/** @template R */
class ReadableStream {
/** @type {ReadableStreamDefaultController | ReadableByteStreamController} */
[_controller];
/** @type {boolean} */
[_detached];
/** @type {boolean} */
[_disturbed];
/** @type {ReadableStreamDefaultReader | undefined} */
[_reader];
/** @type {"readable" | "closed" | "errored"} */
[_state];
/** @type {any} */
[_storedError];
/**
* @param {UnderlyingSource=} underlyingSource
* @param {QueuingStrategy=} strategy
*/
constructor(underlyingSource, strategy = {}) {
const underlyingSourceDict = convertUnderlyingSource(underlyingSource);
initializeReadableStream(this);
if (underlyingSourceDict.type === "bytes") {
if (strategy.size !== undefined) {
throw new RangeError(
`When underlying source is "bytes", strategy.size must be undefined.`,
);
}
const highWaterMark = extractHighWaterMark(strategy, 0);
setUpReadableByteStreamControllerFromUnderlyingSource(
// @ts-ignore cannot easily assert this is ReadableStream
this,
underlyingSource,
underlyingSourceDict,
highWaterMark,
);
} else {
assert(!("type" in underlyingSourceDict));
const sizeAlgorithm = extractSizeAlgorithm(strategy);
const highWaterMark = extractHighWaterMark(strategy, 1);
setUpReadableStreamDefaultControllerFromUnderlyingSource(
this,
underlyingSource,
underlyingSourceDict,
highWaterMark,
sizeAlgorithm,
);
}
}
/** @returns {boolean} */
get locked() {
return isReadableStreamLocked(this);
}
/**
* @param {any=} reason
* @returns {Promise}
*/
cancel(reason) {
if (isReadableStreamLocked(this)) {
Promise.reject(new TypeError("Cannot cancel a locked ReadableStream."));
}
return readableStreamCancel(this, reason);
}
/**
* @param {ReadableStreamGetReaderOptions=} options
* @returns {ReadableStreamDefaultReader}
*/
getReader(options = {}) {
if (typeof options !== "object") {
throw new TypeError("options must be an object");
}
if (options === null) {
options = {};
}
/** @type {any} */
let { mode } = options;
if (mode === undefined) {
return acquireReadableStreamDefaultReader(this);
}
mode = String(mode);
if (mode !== "byob") {
throw new TypeError("Invalid mode.");
}
// 3. Return ? AcquireReadableStreamBYOBReader(this).
throw new RangeError(`Unsupported mode "${String(mode)}"`);
}
/**
* @template T
* @param {{ readable: ReadableStream, writable: WritableStream }} transform
* @param {PipeOptions=} options
* @returns {ReadableStream}
*/
pipeThrough(
{ readable, writable },
{ preventClose, preventAbort, preventCancel, signal } = {},
) {
if (isReadableStreamLocked(this)) {
throw new TypeError("ReadableStream is already locked.");
}
if (isWritableStreamLocked(writable)) {
throw new TypeError("Target WritableStream is already locked.");
}
const promise = readableStreamPipeTo(
this,
writable,
preventClose,
preventAbort,
preventCancel,
signal,
);
setPromiseIsHandledToTrue(promise);
return readable;
}
/**
* @param {WritableStream} destination
* @param {PipeOptions=} options
* @returns {Promise}
*/
pipeTo(
destination,
{
preventClose = false,
preventAbort = false,
preventCancel = false,
signal,
} = {},
) {
if (isReadableStreamLocked(this)) {
return Promise.reject(
new TypeError("ReadableStream is already locked."),
);
}
if (isWritableStreamLocked(destination)) {
return Promise.reject(
new TypeError("destination WritableStream is already locked."),
);
}
return readableStreamPipeTo(
this,
destination,
preventClose,
preventAbort,
preventCancel,
signal,
);
}
/** @returns {[ReadableStream, ReadableStream]} */
tee() {
return readableStreamTee(this, false);
}
/**
* @param {ReadableStreamIteratorOptions=} options
* @returns {AsyncIterableIterator}
*/
[Symbol.asyncIterator]({ preventCancel } = {}) {
/** @type {AsyncIterableIterator} */
const iterator = Object.create(readableStreamAsyncIteratorPrototype);
const reader = acquireReadableStreamDefaultReader(this);
iterator[_reader] = reader;
iterator[_preventCancel] = preventCancel;
return iterator;
}
[customInspect]() {
return `${this.constructor.name} ${
Deno.inspect({ locked: this.locked })
}`;
}
}
/** @template R */
class ReadableStreamGenericReader {
/** @type {Deferred} */
[_closedPromise];
/** @type {ReadableStream | undefined} */
[_stream];
get closed() {
return this[_closedPromise].promise;
}
/**
* @param {any} reason
* @returns {Promise}
*/
cancel(reason) {
if (this[_stream] === undefined) {
return Promise.reject(
new TypeError("Reader has no associated stream."),
);
}
return readableStreamReaderGenericCancel(this, reason);
}
}
/** @template R */
class ReadableStreamDefaultReader extends ReadableStreamGenericReader {
/** @type {ReadRequest[]} */
[_readRequests];
/** @param {ReadableStream} stream */
constructor(stream) {
if (!(stream instanceof ReadableStream)) {
throw new TypeError("stream is not a ReadableStream");
}
super();
setUpReadableStreamDefaultReader(this, stream);
}
/** @returns {Promise>} */
read() {
if (this[_stream] === undefined) {
return Promise.reject(
new TypeError("Reader has no associated stream."),
);
}
/** @type {Deferred>} */
const promise = new Deferred();
/** @type {ReadRequest} */
const readRequest = {
chunkSteps(chunk) {
promise.resolve({ value: chunk, done: false });
},
closeSteps() {
promise.resolve({ value: undefined, done: true });
},
errorSteps(e) {
promise.reject(e);
},
};
readableStreamDefaultReaderRead(this, readRequest);
return promise.promise;
}
/** @returns {void} */
releaseLock() {
if (this[_stream] === undefined) {
return;
}
if (this[_readRequests].length) {
throw new TypeError(
"There are pending read requests, so the reader cannot be release.",
);
}
readableStreamReaderGenericRelease(this);
}
[customInspect]() {
return `${this.constructor.name} { closed: ${String(this.closed)} }`;
}
}
class ReadableByteStreamController {
/** @type {number | undefined} */
[_autoAllocateChunkSize];
/** @type {null} */
[_byobRequest];
/** @type {(reason: any) => Promise} */
[_cancelAlgorithm];
/** @type {boolean} */
[_closeRequested];
/** @type {boolean} */
[_pullAgain];
/** @type {(controller: this) => Promise} */
[_pullAlgorithm];
/** @type {boolean} */
[_pulling];
/** @type {ReadableByteStreamQueueEntry[]} */
[_queue];
/** @type {number} */
[_queueTotalSize];
/** @type {boolean} */
[_started];
/** @type {number} */
[_strategyHWM];
/** @type {ReadableStream} */
[_stream];
get byobRequest() {
return undefined;
}
/** @returns {number | null} */
get desiredSize() {
return readableByteStreamControllerGetDesiredSize(this);
}
/** @returns {void} */
close() {
if (this[_closeRequested] === true) {
throw new TypeError("Closed already requested.");
}
if (this[_stream][_state] !== "readable") {
throw new TypeError(
"ReadableByteStreamController's stream is not in a readable state.",
);
}
readableByteStreamControllerClose(this);
}
/**
* @param {ArrayBufferView} chunk
* @returns {void}
*/
enqueue(chunk) {
if (chunk.byteLength === 0) {
throw new TypeError("chunk must have a non-zero byteLength.");
}
if (chunk.buffer.byteLength === 0) {
throw new TypeError("chunk's buffer must have a non-zero byteLength.");
}
if (this[_closeRequested] === true) {
throw new TypeError(
"Cannot enqueue chunk after a close has been requested.",
);
}
if (this[_stream][_state] !== "readable") {
throw new TypeError(
"Cannot enqueue chunk when underlying stream is not readable.",
);
}
return readableByteStreamControllerEnqueue(this, chunk);
}
/**
* @param {any=} e
* @returns {void}
*/
error(e) {
readableByteStreamControllerError(this, e);
}
/**
* @param {any} reason
* @returns {Promise}
*/
[_cancelSteps](reason) {
// 4.7.4. CancelStep 1. If this.[[pendingPullIntos]] is not empty,
resetQueue(this);
const result = this[_cancelAlgorithm](reason);
readableByteStreamControllerClearAlgorithms(this);
return result;
}
/**
* @param {ReadRequest} readRequest
* @returns {void}
*/
[_pullSteps](readRequest) {
/** @type {ReadableStream} */
const stream = this[_stream];
assert(readableStreamHasDefaultReader(stream));
if (this[_queueTotalSize] > 0) {
assert(readableStreamGetNumReadRequests(stream) === 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;
}
// 4. Let autoAllocateChunkSize be this.[[autoAllocateChunkSize]].
// 5. If autoAllocateChunkSize is not undefined,
readableStreamAddReadRequest(stream, readRequest);
readableByteStreamControllerCallPullIfNeeded(this);
}
}
/** @template R */
class ReadableStreamDefaultController {
/** @type {(reason: any) => Promise} */
[_cancelAlgorithm];
/** @type {boolean} */
[_closeRequested];
/** @type {boolean} */
[_pullAgain];
/** @type {(controller: this) => Promise} */
[_pullAlgorithm];
/** @type {boolean} */
[_pulling];
/** @type {Array>} */
[_queue];
/** @type {number} */
[_queueTotalSize];
/** @type {boolean} */
[_started];
/** @type {number} */
[_strategyHWM];
/** @type {(chunk: R) => number} */
[_strategySizeAlgorithm];
/** @type {ReadableStream} */
[_stream];
/** @returns {number | null} */
get desiredSize() {
return readableStreamDefaultControllerGetDesiredSize(this);
}
/** @returns {void} */
close() {
if (readableStreamDefaultControllerCanCloseOrEnqueue(this) === false) {
throw new TypeError("The stream controller cannot close or enqueue.");
}
readableStreamDefaultControllerClose(this);
}
/**
* @param {R} chunk
* @returns {void}
*/
enqueue(chunk) {
if (readableStreamDefaultControllerCanCloseOrEnqueue(this) === false) {
throw new TypeError("The stream controller cannot close or enqueue.");
}
readableStreamDefaultControllerEnqueue(this, chunk);
}
/**
* @param {any=} e
* @returns {void}
*/
error(e) {
readableStreamDefaultControllerError(this, e);
}
/**
* @param {any} reason
* @returns {Promise}
*/
[_cancelSteps](reason) {
resetQueue(this);
const result = this[_cancelAlgorithm](reason);
readableStreamDefaultControllerClearAlgorithms(this);
return result;
}
/**
* @param {ReadRequest} readRequest
* @returns {void}
*/
[_pullSteps](readRequest) {
const stream = this[_stream];
if (this[_queue].length) {
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);
}
}
}
/**
* @template I
* @template O
*/
class TransformStream {
/** @type {boolean} */
[_backpressure];
/** @type {Deferred} */
[_backpressureChangePromise];
/** @type {TransformStreamDefaultController} */
[_controller];
/** @type {boolean} */
[_detached];
/** @type {ReadableStream} */
[_readable];
/** @type {WritableStream} */
[_writable];
/**
*
* @param {Transformer} transformer
* @param {QueuingStrategy} writableStrategy
* @param {QueuingStrategy} readableStrategy
*/
constructor(
transformer = null,
writableStrategy = {},
readableStrategy = {},
) {
const transformerDict = convertTransformer(transformer);
if (transformerDict.readableType) {
throw new RangeError("readableType transformers not supported.");
}
if (transformerDict.writableType) {
throw new RangeError("writableType transformers not supported.");
}
const readableHighWaterMark = extractHighWaterMark(readableStrategy, 0);
const readableSizeAlgorithm = extractSizeAlgorithm(readableStrategy);
const writableHighWaterMark = extractHighWaterMark(writableStrategy, 1);
const writableSizeAlgorithm = extractSizeAlgorithm(writableStrategy);
/** @type {Deferred} */
const startPromise = new Deferred();
initializeTransformStream(
this,
startPromise,
writableHighWaterMark,
writableSizeAlgorithm,
readableHighWaterMark,
readableSizeAlgorithm,
);
setUpTransformStreamDefaultControllerFromTransformer(
this,
transformer,
transformerDict,
);
if ("start" in transformerDict) {
startPromise.resolve(
transformerDict.start.call(transformer, this[_controller]),
);
} else {
startPromise.resolve(undefined);
}
}
/** @returns {ReadableStream} */
get readable() {
return this[_readable];
}
/** @returns {WritableStream} */
get writable() {
return this[_writable];
}
[customInspect]() {
return `${this.constructor.name} ${
Deno.inspect(
{ readable: this.readable, writable: this.writable },
{ depth: 1 },
)
}`;
}
}
/** @template O */
class TransformStreamDefaultController {
/** @type {(controller: this) => Promise} */
[_flushAlgorithm];
/** @type {TransformStream} */
[_stream];
/** @type {(chunk: O, controller: this) => Promise} */
[_transformAlgorithm];
/** @returns {number | null} */
get desiredSize() {
const readableController = this[_stream][_readable][_controller];
return readableStreamDefaultControllerGetDesiredSize(
/** @type {ReadableStreamDefaultController} */ (readableController),
);
}
/**
* @param {O} chunk
* @returns {void}
*/
enqueue(chunk) {
transformStreamDefaultControllerEnqueue(this, chunk);
}
/**
* @param {any=} reason
* @returns {void}
*/
error(reason) {
transformStreamDefaultControllerError(this, reason);
}
/** @returns {void} */
terminate() {
transformStreamDefaultControllerTerminate(this);
}
}
/** @template W */
class WritableStream {
/** @type {boolean} */
[_backpressure];
/** @type {Deferred | undefined} */
[_closeRequest];
/** @type {WritableStreamDefaultController} */
[_controller];
/** @type {boolean} */
[_detached];
/** @type {Deferred | undefined} */
[_inFlightWriteRequest];
/** @type {Deferred | undefined} */
[_inFlightCloseRequest];
/** @type {PendingAbortRequest | undefined} */
[_pendingAbortRequest];
/** @type {"writable" | "closed" | "erroring" | "errored"} */
[_state];
/** @type {any} */
[_storedError];
/** @type {WritableStreamDefaultWriter} */
[_writer];
/** @type {Deferred[]} */
[_writeRequests];
/**
* @param {UnderlyingSink=} underlyingSink
* @param {QueuingStrategy=} strategy
*/
constructor(underlyingSink = null, strategy = {}) {
const underlyingSinkDict = convertUnderlyingSink(underlyingSink);
if (underlyingSinkDict.type != null) {
throw new RangeError(
'WritableStream does not support "type" in the underlying sink.',
);
}
initializeWritableStream(this);
const sizeAlgorithm = extractSizeAlgorithm(strategy);
const highWaterMark = extractHighWaterMark(strategy, 1);
setUpWritableStreamDefaultControllerFromUnderlyingSink(
this,
underlyingSink,
underlyingSinkDict,
highWaterMark,
sizeAlgorithm,
);
}
/** @returns {boolean} */
get locked() {
return isWritableStreamLocked(this);
}
/**
* @param {any=} reason
* @returns {Promise