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let promise_func = null;
let promise = new Promise(resolve => promise_func = resolve);
const SERVICE_WORKER_TEST_CHANNEL_NAME = 'service worker';
const bc3 = new BroadcastChannel(SERVICE_WORKER_TEST_CHANNEL_NAME);
bc3.onmessage = e => {
bc3.postMessage('done');
promise_func();
};
bc3.postMessage('from worker');
// Ensure that the worker stays alive for the duration of the test
self.addEventListener('install', evt => {
evt.waitUntil(promise);
});