src/v8/test/mjsunit/d8/d8-worker-spawn-worker.js

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if (this.Worker) {
  var workerScript =
    `var w = new Worker('postMessage(42)', {type: 'string'});
     onmessage = function(parentMsg) {
       w.postMessage(parentMsg);
       var childMsg = w.getMessage();
       postMessage(childMsg);
     };`;

  var w = new Worker(workerScript, {type: 'string'});
  w.postMessage(9);
  assertEquals(42, w.getMessage());
}