Correct way to connect and test firebase emulator with react native app

Question

I am implementing a react native app with firebase as serverless backend. I am facing some errors when trying to connect my app to firebase emulator. I am using https://www.npmjs.com/package/firebase package as my firebase module in react-native. Here are a few methods that I tried :

Snippet 1:

const firebase = require('firebase/app');
const db = firebase.firestore();

db.settings({ host: 'localhost:8080', ssl: false });

Error ::

@firebase/firestore:, Firestore (7.8.1): Could not reach Cloud Firestore backend. Connection failed 1 times. Most recent error: FirebaseError: [code=unavailable]: The operation could not be completed

Snippet 2:

firebase.firestore().useEmulator("localhost", 8080);

Error ::

TypeError: firebase.firestore().useEmulator is not a function. (In 'firebase.firestore().useEmulator("localhost", 8080)', 'firebase.firestore().useEmulator' is undefined)

question from:https://stackoverflow.com/questions/65645027/correct-way-to-connect-and-test-firebase-emulator-with-react-native-app