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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; // TODO: Remove this for the next major release
module.exports.default = pLocate;
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