chromium/third_party/blink/web_tests/external/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/resources/extendable-message-event-worker.js

importScripts('./extendable-message-event-utils.js');

self.addEventListener('message', function(event) {
    event.source.postMessage(ExtendableMessageEventUtils.serialize(event));
  });