JAVASCRIPT

Initialize Firebase in your app

import { initializeApp } from 'firebase/app';

// TODO: Replace the following with your app's Firebase project configuration
const firebaseConfig = {
  //...
};

const app = initializeApp(firebaseConfig);

initialize firebase app

const { initializeApp } = require('firebase/app');
const { getFirestore, collection, getDocs } = require('firebase/firestore');
// ...