chromium/src/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/events/event-handler-processing-algorithm-error/workerglobalscope-synthetic-event.worker.js

"use strict";
importScripts("/resources/testharness.js");

setup({ allow_uncaught_exception: true });

promise_test(t => {
  self.onerror = t.step_func((...args) => {
    assert_equals(args.length, 1);
    return true;
  });

  const eventWatcher = new EventWatcher(t, self, "error");
  const promise = eventWatcher.wait_for("error").then(e => {
    assert_equals(e.defaultPrevented, false);
  });

  self.dispatchEvent(new Event("error", { cancelable: true }));

  return promise;
}, "error event is normal (return true does not cancel; one arg) on WorkerGlobalScope, with a synthetic Event");

done();