File: nested_worker_wrapper.js

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// Hold the nested worker alive until this parent worker closes.
var worker;

var searchParams = new URL(location.href).searchParams;

addEventListener("message", function nestedWorkerWrapperOnMessage(evt) {
  removeEventListener("message", nestedWorkerWrapperOnMessage);

  var mode = searchParams.get("mode");
  var script = searchParams.get("script");
  worker = new Worker(`worker_wrapper.js?mode=${mode}&script=${script}`);

  worker.addEventListener("message", function (evt) {
    self.postMessage({
      context: "NestedWorker",
      type: evt.data.type,
      status: evt.data.status,
      msg: evt.data.msg,
    });
  });

  worker.addEventListener("error", function (evt) {
    self.postMessage({
      context: "NestedWorker",
      type: "status",
      status: false,
      msg: "Nested worker error: " + evt.message,
    });
  });

  worker.postMessage(evt.data);
});