chromium/third_party/blink/web_tests/external/wpt/service-workers/service-worker/resources/onactivate-waituntil-forever.js

'use strict';

self.addEventListener('activate', event => {
  event.waitUntil(new Promise(() => {
        // Use a promise that never resolves to prevent this service worker from
        // advancing past the 'activating' state.
      }));
});