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Add the asIndexedPairs method for readable streams. PR-URL: #41681 Refs: https://github.com/tc39/proposal-iterator-helpers#asindexedpairs Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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import '../common/index.mjs'; | ||
import { Readable } from 'stream'; | ||
import { deepStrictEqual, rejects } from 'assert'; | ||
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{ | ||
// asIndexedPairs with a synchronous stream | ||
const pairs = await Readable.from([1, 2, 3]).asIndexedPairs().toArray(); | ||
deepStrictEqual(pairs, [[0, 1], [1, 2], [2, 3]]); | ||
const empty = await Readable.from([]).asIndexedPairs().toArray(); | ||
deepStrictEqual(empty, []); | ||
} | ||
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{ | ||
// asIndexedPairs works an asynchronous streams | ||
const asyncFrom = (...args) => Readable.from(...args).map(async (x) => x); | ||
const pairs = await asyncFrom([1, 2, 3]).asIndexedPairs().toArray(); | ||
deepStrictEqual(pairs, [[0, 1], [1, 2], [2, 3]]); | ||
const empty = await asyncFrom([]).asIndexedPairs().toArray(); | ||
deepStrictEqual(empty, []); | ||
} | ||
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{ | ||
// Does not enumerate an infinite stream | ||
const infinite = () => Readable.from(async function* () { | ||
while (true) yield 1; | ||
}()); | ||
const pairs = await infinite().asIndexedPairs().take(3).toArray(); | ||
deepStrictEqual(pairs, [[0, 1], [1, 1], [2, 1]]); | ||
const empty = await infinite().asIndexedPairs().take(0).toArray(); | ||
deepStrictEqual(empty, []); | ||
} | ||
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{ | ||
// AbortSignal | ||
await rejects(async () => { | ||
const ac = new AbortController(); | ||
const { signal } = ac; | ||
const p = Readable.from([1, 2, 3]).asIndexedPairs({ signal }).toArray(); | ||
ac.abort(); | ||
await p; | ||
}, { name: 'AbortError' }); | ||
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await rejects(async () => { | ||
const signal = AbortSignal.abort(); | ||
await Readable.from([1, 2, 3]).asIndexedPairs({ signal }).toArray(); | ||
}, /AbortError/); | ||
} |