Implementing workerjs in code that is used both in the browser and in Node.js

detect-nodejs.js

// A reliable method to detect if we are running in Node.js
const isNodeJS = new Function('try {return this===global;}catch(e){return false;}')();

var UniversalWorker;
var uri;

if (isNodeJS) {
    
    // Dynamically load "workerjs"
    UniversalWorker = require('workerjs');      
    
    // The actual worker code is the same for Node.js, but the
    // location is different because we use browserify.
    uri = 'src/RayTraceWorker.js';              

} else {
    
     // If we are in the browser, "Worker" is already defined.
    UniversalWorker = Worker;                  
    uri = 'www/RayTraceWorker.js';              

}

var worker = new UniversalWorker(uri);

// ... continue to use the worker.