frontend/src/lib/firebase.js

import { initializeApp } from 'firebase/app'
import { getAuth, GoogleAuthProvider } from 'firebase/auth'

const firebaseConfig = {
  apiKey:            import.meta.env.VITE_FIREBASE_API_KEY,
  authDomain:        import.meta.env.VITE_FIREBASE_AUTH_DOMAIN,
  projectId:         import.meta.env.VITE_FIREBASE_PROJECT_ID,
  storageBucket:     import.meta.env.VITE_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: import.meta.env.VITE_FIREBASE_MESSAGING_SENDER_ID,
  appId:             import.meta.env.VITE_FIREBASE_APP_ID,
}

const app  = initializeApp(firebaseConfig)
export const auth     = getAuth(app)
export const googleProvider = new GoogleAuthProvider()