WebWorker make by a string.

WebWorker.make.by.a.string.html

<script>
const WORKER_RESOURCE = `
self.onmessage = (event) => {
  debugger;
  postMessage(event.data + " worker"); // hello worker
}`;

const blob = new Blob( [ WORKER_RESOURCE ], { type: "application/javascript" } );
const blobURL = URL.createObjectURL(blob); // -> URL.revokeObjectURL(blobURL);
const worker = new Worker(blobURL);

worker.onmessage = (event) => { // @arg EventObject - { data: "hello worker" }
  alert('resp: ' + event.data);
};
worker.postMessage('hello');
</script>