Web firebase.messaging().onMessage not fired, but background notification perfectly fired

Question

I want to reload or trigger some event in foregrounf if push message is sent with firebase.messaging().onMessage, but it not fired. I'm using firebase.mesaging.sw.js with background notification and it works correctly what is wrong with my code?

firebase.js

const config = {
  apiKey: "x",
  projectId: "x",
  storageBucket: "x",
  messagingSenderId: "x"
};

firebase.initializeApp(config);

const msg = firebase.messaging()
msg.requestPermission()
  .then(() => {
    return msg.getToken()
  })
  .then((token) => {
  })
  .catch((err) => {
  })

msg.onMessage(function(payload) {
  alert("Foreground message fired!")
  console.log(payload)
});

firebase.messaging.sw.js

importScripts("https://www.gstatic.com/firebasejs/7.0.0/firebase-app.js");
importScripts("https://www.gstatic.com/firebasejs/7.0.0/firebase-messaging.js");

const config = {
  apiKey: "x",
  projectId: "x",
  storageBucket: 'x',
  messagingSenderId: "x"
};

firebase.initializeApp(config);
const msg = firebase.messaging()

msg.setBackgroundMessageHandler(function(payload) {
  let options = {
    body: payload.data.body,
    icon: payload.data.icon
  }

  return self.registration.showNotification(payload.data.title, options);

});

I don't know what is wrong with my code

Answer 1

Simple solution to this is update your Firebse to latest version.

Eg.

importScripts('https://www.gstatic.com/firebasejs/7.8.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/7.8.0/firebase-messaging.js');

Note: Once you have updated your firebase libraries versions then messagingSenderId will not work in your firebase-messaging-sw.js file. You have to provide all other params eg. apiKey, projectId, appId along with messagingSenderId.

• If still not work. Clean your browser cache and re-register service worker.

For more details you can refer to this solution