I am getting this error:

typeError:Cannot read properties of undefined (reading 'app')

How can I fix it?

import firebase from './firebase';

const firebaseConfig = {
    apiKey: "My api key",
    authDomain: "domain",
    projectId: "project id",
    storageBucket: "Bucket",
    messagingSenderId: "SenderId",
    appId: "my appid",
  };

  const app = !firebase.app.length
   ? firebase.initialzeApp(firebaseConfig)
    : firebase.app();

    const db = apps.firestore();
    const auth = app.auth();
    const provider = new firebase.auth.GoogleAuthProvider();

    export {db, auth, provider}
    ...