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/** * Copyright (c) 2017 ~ present NAVER Corp. * billboard.js project is licensed under the MIT license */import {window} from "./browser";
// Store blob in memoryconst blob = {};
/** * Get Object URL * @param {Function} fn Function to be executed in worker * @param {Array} depsFn Dependency functions to run given function(fn). * @returns {string} * @private */function getObjectURL(fn: Function, depsFn?: Function[]): string {	const fnString = fn.toString();	const key = fnString.replace(/(function|[\s\W\n])/g, "").substring(0, 15);
	if (!(key in blob)) {		// Web Worker body		blob[key] = new window.Blob([			`${depsFn?.map(String).join(";") ?? ""}
			self.onmessage=function({data}) {				const result = (${fnString}).apply(null, data);				self.postMessage(result);			};`		], {			type: "text/javascript"		});	}
	return window.URL.createObjectURL(blob[key]);}
/** * Create and run on Web Worker * @param {boolean} useWorker Use Web Worker * @param {Function} fn Function to be executed in worker * @param {Function} callback Callback function to receive result from worker * @param {Array} depsFn Dependency functions to run given function(fn). * @returns {object} * @example * 	const worker = runWorker(function(arg) { *		  // do some tasks... *		  console.log("param:", A(arg)); * *		  return 1234; *	   }, function(data) { *		  // callback after worker is done *	 	  console.log("result:", data); *	   }, *	   [function A(){}] *	); * *	worker(11111); * @private */export function runWorker(	useWorker = true, fn: Function, callback: Function, depsFn?: Function[]): Function {	let runFn;
	if (window.Worker && useWorker) {		const src = getObjectURL(fn, depsFn);		const worker = new window.Worker(src);
		runFn = function(...args) {			// trigger worker			worker.postMessage(args);
			// listen worker			worker.onmessage = function(e) {				// release object URL from memory				window.URL.revokeObjectURL(src);
				return callback(e.data);			};
			// handle error			worker.onerror = function(e) {				console.error(e);			};
			// return new Promise((resolve, reject) => {			// 	worker.onmessage = ({data}) => resolve(data);			// 	worker.onerror = reject;			// });		};	} else {		runFn = function(...args) {			const res = fn(...args);
			callback(res);		};	}
	return runFn;}