firebaseConfig.js

// Import the functions you need from the SDKs you need
import { initializeApp } from "firebase/app";
import { getAnalytics, isSupported } from "firebase/analytics";
// 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
// For Firebase JS SDK v7.20.0 and later, measurementId is optional

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_MEASUREMENT_ID,
};

// Now you can use firebaseConfig object as before, but with values from environment variables.

// Initialize Firebase
export const app = initializeApp(firebaseConfig);
// const analytics = getAnalytics(app);
const analytics = isSupported().then((yes) => (yes ? getAnalytics(app) : null));