29 lines
806 B
JavaScript
29 lines
806 B
JavaScript
'use strict'
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// https://github.com/jprichardson/node-fs-extra/issues/1056
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// Performing parallel operations on each item of an async iterator is
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// surprisingly hard; you need to have handlers in place to avoid getting an
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// UnhandledPromiseRejectionWarning.
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// NOTE: This function does not presently handle return values, only errors
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async function asyncIteratorConcurrentProcess (iterator, fn) {
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const promises = []
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for await (const item of iterator) {
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promises.push(
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fn(item).then(
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() => null,
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(err) => err ?? new Error('unknown error')
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)
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)
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}
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await Promise.all(
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promises.map((promise) =>
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promise.then((possibleErr) => {
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if (possibleErr !== null) throw possibleErr
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})
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)
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)
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}
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module.exports = {
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asyncIteratorConcurrentProcess
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}
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