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Original file line number | Diff line number | Diff line change |
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'use strict'; | ||
const AggregateError = require('aggregate-error'); | ||
|
||
module.exports = async ( | ||
iterable, | ||
mapper, | ||
{ | ||
concurrency = Infinity, | ||
stopOnError = true | ||
} = {} | ||
) => { | ||
return new Promise((resolve, reject) => { | ||
if (typeof mapper !== 'function') { | ||
throw new TypeError('Mapper function is required'); | ||
} | ||
|
||
if (!((Number.isSafeInteger(concurrency) || concurrency === Infinity) && concurrency >= 1)) { | ||
throw new TypeError(`Expected \`concurrency\` to be an integer from 1 and up or \`Infinity\`, got \`${concurrency}\` (${typeof concurrency})`); | ||
} | ||
|
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const result = []; | ||
const errors = []; | ||
const iterator = iterable[Symbol.iterator](); | ||
let isRejected = false; | ||
let isIterableDone = false; | ||
let resolvingCount = 0; | ||
let currentIndex = 0; | ||
|
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const next = () => { | ||
if (isRejected) { | ||
return; | ||
} | ||
|
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const nextItem = iterator.next(); | ||
const index = currentIndex; | ||
currentIndex++; | ||
|
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if (nextItem.done) { | ||
isIterableDone = true; | ||
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if (resolvingCount === 0) { | ||
if (!stopOnError && errors.length !== 0) { | ||
reject(new AggregateError(errors)); | ||
} else { | ||
resolve(result); | ||
} | ||
} | ||
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return; | ||
} | ||
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resolvingCount++; | ||
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(async () => { | ||
try { | ||
const element = await nextItem.value; | ||
result[index] = await mapper(element, index); | ||
resolvingCount--; | ||
next(); | ||
} catch (error) { | ||
if (stopOnError) { | ||
isRejected = true; | ||
reject(error); | ||
} else { | ||
errors.push(error); | ||
resolvingCount--; | ||
next(); | ||
} | ||
} | ||
})(); | ||
}; | ||
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for (let i = 0; i < concurrency; i++) { | ||
next(); | ||
|
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if (isIterableDone) { | ||
break; | ||
} | ||
} | ||
}); | ||
}; |
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