spawn a webworker without the need for a seperate file, including requirejs functionality

main.js

/*
  assuming a rather standard requirejs script tag referring to main(.js)
   <script type="text/javascript" data-main="main" src="js/require.min.js"></script>
*/

var w = newRequireWorker({
		shim: { three: { exports: 'THREE' } },
		baseUrl: 'js',
		paths: { three: 'three.min' }
	},
	function () {
		require(['three'], function () {
			self.postMessage('rev: '+THREE.REVISION);
		});
	});
w.onmessage = function (e) {
	console.log('msg from worker:', e.data);
};

// msg from worker: rev: 65 


/**
 * build a worker from an anonymous function body
 * worker has requirejs loaded and configured (baseUrl at least)
 *  so require() is available.
 *
 *  NOTE: can pass the main config like so:
 *      $.extend( requirejs.s.contexts._.config, {deps: null} )
 *   careful though, as these are requirejs internals and may change in the future! ;)
 *
 * @param {object} requirejsCfg
 * @param {function} funcObj
 * @param {string=} scriptPath - defaults to path of current file
 * @param {string=} requirejsPath - defaults to path of requirejs script src
 * @returns {Worker}
 */
function newRequireWorker(requirejsCfg, funcObj, scriptPath, requirejsPath) {
	if (scriptPath === undefined) // make an educated guess about the absolute path of this script
		scriptPath = document.location.href.substr(0, document.location.href.lastIndexOf('/') + 1);

	if (requirejsPath === undefined) // load requirejs from 'src' of script tag with 'data-main' set
		requirejsPath = $('script[data-main]').attr('src');

	var src, cfg = $.extend(requirejsCfg, {baseUrl: scriptPath + (requirejsCfg.baseUrl || '')});
	$.ajax({
		url: requirejsPath,
		async: false,
		success: function (result) {
			src = result
		}
	});
	var blobURL = URL.createObjectURL(new Blob([
			src,
			'requirejs.config(' + JSON.stringify(cfg) + ');',
			'(', funcObj.toString(), ')();'
		], {type: 'application/javascript'})),
		worker = new Worker(blobURL);
	URL.revokeObjectURL(blobURL);
	return worker;
}