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a71e61791c
Always use ReadableStream asyncIterator polyfill GitOrigin-RevId: 660a7316a549fe4ce4fc6bd1ef1a7d7e58759f14
44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
// @ts-nocheck
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/**
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* A polyfill for `ReadableStream.protototype[Symbol.asyncIterator]`,
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* aligning as closely as possible to the specification.
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*
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* from https://gist.github.com/MattiasBuelens/496fc1d37adb50a733edd43853f2f60e
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*
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* @see https://streams.spec.whatwg.org/#rs-asynciterator
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* @see https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream#async_iteration
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*/
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ReadableStream.prototype.values ??= function ({ preventCancel = false } = {}) {
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const reader = this.getReader()
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return {
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async next() {
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try {
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const result = await reader.read()
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if (result.done) {
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reader.releaseLock()
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}
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return result
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} catch (e) {
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reader.releaseLock()
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throw e
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}
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},
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async return(value) {
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if (!preventCancel) {
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const cancelPromise = reader.cancel(value)
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reader.releaseLock()
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await cancelPromise
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} else {
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reader.releaseLock()
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}
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return { done: true, value }
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},
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[Symbol.asyncIterator]() {
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return this
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},
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}
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}
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ReadableStream.prototype[Symbol.asyncIterator] ??=
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ReadableStream.prototype.values
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