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Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at
The complete set of authors may be found at
The complete set of contributors may be found at
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at
Utility method that calls a callback whenever the network connectivity of the app changes.
The callback should take a boolean parameter (with `true` meaning
the network is offline, and `false` meaning online)
import { installOfflineWatcher } from 'pwa-helpers/network.js';
installOfflineWatcher((offline) => {
console.log('You are ' + offline ? ' offline' : 'online');
export const installOfflineWatcher = (offlineUpdatedCallback: (isOffline: boolean) => void) => {
window.addEventListener('online', () => offlineUpdatedCallback(false));
window.addEventListener('offline', () => offlineUpdatedCallback(true));
offlineUpdatedCallback(navigator.onLine === false);