Firebase Node js function that pushes notifications upon listening to database change

pushNotification.js

//import firebase functions modules
const functions = require('firebase-functions');
//import admin module
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);


// Listens for new messages added to messages/:pushId
exports.notificationSender = functions.database.ref('/messages/{pushId}').onWrite((change,context) => {

    console.log('Message Received');

    //  Grab the current value of what was written to the Realtime Database.
    const valueObject = change.after.val();

  // Create a notification
    const payload = {
        notification: {
            title:valueObject.title,
            body: valueObject.message,
            sound: "default"
        },
    };

  //Create an options object that contains the time to live for the notification and the priority
    const options = {
        priority: "high",
        timeToLive: 60 * 60 * 24
    };


    return admin.messaging().sendToTopic("messages", payload, options);
});