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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;
 
 
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