How to call function from App.js file inside public folder in React JS

I would like to call a function which is defined inside src/App.js (callMe) from public folder,

In App.js

import messaging from './firebase-init';
import './App.css';

function App () {
 function callMe() {
   console.log('Call me function called');
 }
  return (
    <div className="App">
      <h1>Hello World</h1>
    </div>
  );
}
export default App;

And I’ve another file firebase-messaging-sw.js located inside public folder,

In firebase-messaging-sw.js

importScripts('https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js');
importScripts('https://www.gstatic.com/firebasejs/8.10.0/firebase-messaging.js');

self.addEventListener('notificationclick', function (event) {
  console.log('On notification click: ', event);
  event.notification.close();
  event.waitUntil(clients.matchAll({
    includeUncontrolled: true,
    type: "window",
  }).then(function (clientList) {
    console.log('********* clientList: ', clientList);
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url !== '' && 'focus' in client) {
        client.focus();
        callMe();  // This function is defined in src/App.js
        break;
      }
    }
  }));
});

const firebaseConfig = {
  apiKey: "API_KEY",
  authDomain: "AUTH_DOMAIN",
  projectId: "PROJECT_ID",
  storageBucket: "STORAGE_BUCKET",
  messagingSenderId: "SENDER_ID",
  appId: "APP_ID",
  measurementId: "MEASUREMENT_ID"
};

// Initialize Firebase
const initializedFirebaseApp = firebase.initializeApp(firebaseConfig);

const messaging = firebase.messaging();

Can you please help me, how should I call function callMe() ?