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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})`); } const result = []; const errors = []; const iterator = iterable[Symbol.iterator](); let isRejected = false; let isIterableDone = false; let resolvingCount = 0; let currentIndex = 0; const next = () => { if (isRejected) { return; } const nextItem = iterator.next(); const index = currentIndex; currentIndex++; if (nextItem.done) { isIterableDone = true; if (resolvingCount === 0) { if (!stopOnError && errors.length !== 0) { reject(new AggregateError(errors)); } else { resolve(result); } } return; } resolvingCount++; (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(); } } })(); }; for (let i = 0; i < concurrency; i++) { next(); if (isIterableDone) { break; } } }); };