Files F120701480

index.js
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Created: Sun, Jul 6, 10:28

index.js
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	import isNode from 'detect-node';
	import BrowserMethod from './browser.js';
	import NodeMethod from './node.js';

	const USE_METHOD = isNode ? NodeMethod : BrowserMethod;
	const LISTENERS = new Set();

	let startedListening = false;
	function startListening() {
	if (startedListening) return;
	startedListening = true;
	USE_METHOD.add(runAll);
	}

	export function add(fn) {
	startListening();
	if (typeof fn !== 'function')
	throw new Error('Listener is no function');
	LISTENERS.add(fn);

	const addReturn = {
	remove: () => LISTENERS.delete(fn),
	run: () => {
	LISTENERS.delete(fn);
	return fn();
	}
	};
	return addReturn;
	}

	export function runAll() {
	const promises = [];
	LISTENERS.forEach(function (fn) {
	promises.push(fn());
	LISTENERS.delete(fn);
	});
	return Promise.all(promises);
	}

	export function removeAll() {
	LISTENERS.clear();
	}

	export function getSize() {
	return LISTENERS.size;
	}

	export default {
	add,
	runAll,
	removeAll,
	getSize
	};

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