angular-docs-cn/packages/service-worker/safety-worker.js

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

// tslint:disable:no-console

self.addEventListener('install', event => {
  self.skipWaiting();
});

self.addEventListener('activate', event => {
  event.waitUntil(self.clients.claim());
  self.registration.unregister().then(() => {
    console.log('NGSW Safety Worker - unregistered old service worker');
  });
});