ww.js

// worker.js
const { Worker, workerData, isMainThread, parentPort } = require('worker_threads');
 
if (isMainThread) {
  const worker1 = new Worker(__filename, { workerData: 'Worker Data 1'});
  worker1.once('message', message => console.log(message));
  const worker2 = new Worker(__filename, { workerData: 'Worker Data 2' });
  worker2.once('message', message => console.log(message));
} else {
  parentPort.postMessage('I am ' + workerData);
}