service-worker.js

'use strict';

self.addEventListener('push', function(event) {
  console.log('Received a push message', event);

  var title = 'MyDeal';
  var body = 'Free Shipping Friday - TVs & Projectors';
  var icon = 'https://www.videopro.com.au/images/product/micro/8491_1.jpg';
  var tag = 'Push Tag';

  if (event.data) {
    console.log(event.data.json());
    title = event.data.json().title;
    body = event.data.json().body;
    icon = event.data.json().icon;
    tag = event.data.json().tag;
  }

  event.waitUntil(
    self.registration.showNotification(title, {
      body: body,
      icon: icon,
      tag: tag
    })
  );
});

self.addEventListener('notificationclick', function(event) {
  console.log('On notification click: ', event.notification.tag);
  // Android doesn’t close the notification when you click on it
  // See: http://crbug.com/463146
  event.notification.close();

  // This looks to see if the current is already open and
  // focuses if it is
  event.waitUntil(clients.matchAll({
    type: 'window'
  }).then(function(clientList) {
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url === '/' && 'focus' in client) {
        return client.focus();
      }
    }
    if (clients.openWindow) {
      return clients.openWindow('/');
    }
  }));
});