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

'use strict';

self.addEventListener('fetch', event => {
  if (event.request.url.endsWith('waituntil-forever')) {
    event.respondWith(new Promise(() => {
        // Use a promise that never resolves to prevent this fetch from
        // completing.
    }));
  }
});