sgc-portal/mobile-src/public/firebase-messaging-sw.js

// this file must be placed in root

importScripts('https://www.gstatic.com/firebasejs/4.6.1/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/4.6.1/firebase-messaging.js');

firebase.initializeApp({
    messagingSenderId: '813343642322',
});

const messaging = firebase.messaging();

self.addEventListener('push', function (event) {
    const payload = event.data.json() || {};
    const payloadNotification = payload.notification || {};
    const payloadData = payload.data || {};
    const options = {
        body: payloadNotification.body || payloadData.body,
        icon: payloadNotification.icon ||  payloadData.icon ||  '/img/icons/android-chrome-167x167.png',
        badge : '/img/icons/icon-messages-96x96.png',
        image : payloadNotification.image || payloadData.image ,
        vibrate : [300, 100, 400],
        data: payloadNotification.click_action || payloadData.click_action  || payloadNotification.clickAction || payloadData.clickAction 
    };
    event.waitUntil(self.registration.showNotification(payloadNotification.title, options));
});

self.addEventListener('notificationclick', function (event) {
    event.notification.close();
    event.waitUntil(clients.openWindow('/mobile/#' + (event.notification.data || '/home')));
});