My JS code(I am using the browser's window object than modules for now):

<script src="https://www.gstatic.com/firebasejs/9.6.2/firebase-app-compat.js"></script>
    <script src="https://www.gstatic.com/firebasejs/9.6.2/firebase-firestore-compat.js"></script>
    <script src="https://www.gstatic.com/firebasejs/9.6.2/firebase-auth-compat.js"></script>
    <script>
      // TODO: Add SDKs for Firebase products that you want to use
      // https://firebase.google.com/docs/web/setup#available-libraries

      // Your web app's Firebase configuration
      const firebaseConfig = {
       //My app config
      };

      // Initialize Firebase
      const firebaseApp = initializeApp(firebaseConfig);
      const db = firebaseApp.firestore();
      const auth = firebaseApp.auth();
    </script>

But I get this error: initializeApp is not defined