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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>terminate immediate</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var code = "self.onmessage = function () {};";
    var url = URL.createObjectURL(new Blob([code], { type: "application/javascript" }));
    var myWorker = new Worker(url);
    myWorker.terminate();
    URL.revokeObjectURL(url);
    document.getElementById("out").textContent = "Worker terminated";
  </script>
</body>
</html>

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Worker.terminate() — immediate (Try It)