code handover

public/firebase-messaging-sw.js

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+// Give the service worker access to Firebase Messaging.
+// Note that you can only use Firebase Messaging here. Other Firebase libraries
+// are not available in the service worker.
+// Replace 10.13.2 with latest version of the Firebase JS SDK.
+// eslint-disable-next-line no-undef
+importScripts('https://www.gstatic.com/firebasejs/10.13.2/firebase-app-compat.js');
+// eslint-disable-next-line no-undef
+importScripts('https://www.gstatic.com/firebasejs/10.13.2/firebase-messaging-compat.js');
+
+// Initialize the Firebase app in the service worker by passing in
+// your app's Firebase config object.
+// https://firebase.google.com/docs/web/setup#config-object
+// eslint-disable-next-line no-undef
+firebase.initializeApp({
+  apiKey: ' AIzaSyACBg8oyAR2DWMu4xW85gx5thpRgxnvI_0',
+  authDomain: 'nearle-gear.firebaseapp.com',
+  databaseURL: 'https://nearle-gear-default-rtdb.firebaseio.com',
+  projectId: 'nearle-gear',
+  storageBucket: 'nearle-gear.appspot.com',
+  messagingSenderId: '140444764229',
+  appId: '1:140444764229:web:e5ed6259a92d0532283b2c',
+  measurementId: 'G-3YQ4DNMXE5'
+});
+
+// Retrieve an instance of Firebase Messaging so that it can handle background
+// messages.
+// eslint-disable-next-line no-undef
+const messaging = firebase.messaging();
+
+// why here
+
+// When your web app is in the background or closed, the browser shuts down your React app’s JS context (like your firebase.js, App.js, etc.). At this point:
+// Only a Service Worker (like firebase-messaging-sw.js) is allowed to run.
+// It listens for messages even when your app is not active.
+// Firebase automatically routes background messages to that service worker.
+// So you must use onBackgroundMessage() in the service worker.
+// 🔁 Think of the service worker like a "headless background listener" running outside your React app.
+
+messaging.onBackgroundMessage((payload) => {
+  console.log('[firebase-messaging-sw.js] Received background message ', payload);
+  // Customize notification here
+  const notificationTitle = payload.notification.title;
+  const notificationOptions = {
+    body: payload.notification.body,
+    icon: payload.notification.image
+  };
+
+  // eslint-disable-next-line no-restricted-globals
+  self.registration.showNotification(notificationTitle, notificationOptions);
+});