static S jsWorkerFromString(S code) {
  ret "var workerCode = " + jsQuote(code) + [[;

  window.URL = window.URL || window.webkitURL;
  
  var blob;
  try {
      blob = new Blob([workerCode], {type: 'application/javascript'});
  } catch (e) { // Backwards-compatibility
      window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder;
      blob = new BlobBuilder();
      blob.append(workerCode);
      blob = blob.getBlob();
  }
  var worker = new Worker(URL.createObjectURL(blob));
]];
}