StartWebPushNotificationsListener.js

// To Start Listening to all Web Push Notifications
window.notificationsMap = Object.create(null); 
async function getServiceWorkerRegistration(){ 
    window.myServiceWorkerRegistration = await navigator.serviceWorker.getRegistration("https://framework.realtime.co/demo/web-push/"); 
    return window.myServiceWorkerRegistration;
}; 

async function getNotifications() { 
    window.myNotifications = await window.myServiceWorkerRegistration.getNotifications();
}; 

window.notificationListener = setInterval(async function() { 
    console.log("checking for notifications..."); 
    await getServiceWorkerRegistration(); 
    await getNotifications(); 
    for(var key in window.myNotifications){ 
        window.notificationsMap[window.myNotifications[key].tag] = window.myNotifications[key]; 
    }; 
}, 2000);