testing/web-platform/tests/service-workers/service-worker/resources/fetch-waits-for-activate-worker.js


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var activatePromiseResolve;

addEventListener('activate', function(evt) {
  evt.waitUntil(new Promise(function(resolve) {
    activatePromiseResolve = resolve;
  }));
});

addEventListener('message', function(evt) {
  if (typeof activatePromiseResolve === 'function') {
    activatePromiseResolve();
  }
});

addEventListener('fetch', function(evt) {
  evt.respondWith(new Response('Hello world'));
});