File: run_async_code_on_worker.html

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<!doctype html>
<title>Run async code on a worker helper</title>
<script>
const workerCode = `
onmessage = function(e) {
  let AsyncFunction = Object.getPrototypeOf(async function(){}).constructor;
  let receivedFunction = new AsyncFunction(e.data);
  receivedFunction().then(workerResult => {postMessage(workerResult);});
}
`
const workerBlob = new Blob ([workerCode], {type: 'text/javascript'});
const worker = new Worker(window.URL.createObjectURL(workerBlob));

async function runOnWorkerAndWaitForResult(code) {
  worker.postMessage(code);
  return new Promise((resolve, reject) => {
    worker.onmessage = result => {
      resolve(result.data);
    }
    worker.onerror = error => {
      reject(error);
    }
  });
}
</script>