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'use strict'; const pLimit = require('p-limit'); class EndError extends Error { constructor(value) { super(); this.value = value; } } // The input can also be a promise, so we await it const testElement = async (element, tester) => tester(await element); // The input can also be a promise, so we `Promise.all()` them both const finder = async element => { const values = await Promise.all(element); if (values[1] === true) { throw new EndError(values[0]); } return false; }; const pLocate = async (iterable, tester, options) => { options = { concurrency: Infinity, preserveOrder: true, ...options }; const limit = pLimit(options.concurrency); // Start all the promises concurrently with optional limit const items = [...iterable].map(element => [element, limit(testElement, element, tester)]); // Check the promises either serially or concurrently const checkLimit = pLimit(options.preserveOrder ? 1 : Infinity); try { await Promise.all(items.map(element => checkLimit(finder, element))); } catch (error) { if (error instanceof EndError) { return error.value; } throw error; } }; module.exports = pLocate;