firebase.js

// Import the functions you need from the SDKs you need
// https://firebase.google.com/docs/web/learn-more#libraries-cdn
import { initializeApp } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-app.js";
import { getDatabase } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-database.js";
import { getFirestore } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-firestore.js";
import { getAuth } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-auth.js";

// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
//
// TODO replace with your own Firebase app config
//
const firebaseConfig = {
  apiKey: "...",
  authDomain: "...",
  databaseURL: "...",
  projectId: "...",
  storageBucket: "...",
  messagingSenderId: "...",
  appId: "...",
};

// Initialize Firebase
export const app = initializeApp(firebaseConfig);
export const db = getDatabase(app);
export const firestore = getFirestore(app);
export const auth = getAuth(app);