Using RequireJS in Web Worker

require-in-webworker.js

// See documentation: https://requirejs.org/docs/api.html#webworker

// working example: https://jsfiddle.net/yojaar80/2/
// from SO: https://stackoverflow.com/questions/36840329/whats-the-right-way-to-use-require-js-with-web-workers

importScripts("require.js");
requirejs.config({
    //Lib path
    baseUrl: '.',
    // Some specific paths or alternative CDN's
    paths: {
        "socket.io": [
            "//cdn.socket.io/socket.io-1.3.7",
            "socket.io.backup"]
    },
    waitSeconds: 20
});


requirejs(["LibName"], (TheLibrary) = > {
  // code after all is loaded
  self.onmessage = (msg)=>{
    // do stuff
    TheLibrary.doStuff(msg.data);
  }
  // I tend to dispatch some message here
  self.postMessage("worker_loaded");
}

/* Note that it is only after you receive "worker_loaded" that you can 
   post messages to the worker, because only then the message will be accepted. 
   Before, the onmessage callback is not yet estabilished. 
   So your main code should look: */

var worker = new Worker("myworker.js");
worker.onmessage = function(e) {
  if(e.data=="worker_loaded") { 
    // Tell worker to do some stuff
  }
}

// Example from: http://ruslanas.wri.lt/requirejs-in-web-worker/

// worker.js
importScripts('require.js');
 
require(['module'], function(dep) {
	postMessage('module loaded');
	onmessage = function(msg) {
		// do cool stuff
		postMessage('done');
	}
});
 

// script.js
var worker = new Worker('worker.js');

// following message will not be heard
worker.postMessage('listening');
worker.onmessage = function(e) {
	switch(e.data) {
		case 'module loaded':
			worker.postMessage('data');
			break;
		case 'done':
			// update GUI
			break;
	}
}