How to authenticate user offline with Firebase in React-Native?

I am trying to use Firebase authentication offline on my React-Native App. But I get:

auth/network-request-failed [auth/network-request-failed] A network error (such as timeout, interrupted connection or unreachable host) has occurred.

When I try this answer using Typescript: const initFirebase = firebase.initializeApp({persistence: true}); I get:

No overload matches this call.Overload 1 of 2, '(options: FirebaseAppOptions, config?: FirebaseAppConfig | undefined): Promise', gave the following error.Argument of type '{ persistence: boolean; }' is not assignable to parameter of type 'FirebaseAppOptions'.Type '{ persistence: boolean; }' is missing the following properties from type 'FirebaseAppOptions': appId, projectIdOverload 2 of 2, '(options: FirebaseAppOptions, name?: string | undefined): Promise', gave the following error.Argument of type '{ persistence: boolean; }' is not assignable to parameter of type 'FirebaseAppOptions'.

This is my signIn method:

import firebase from '@react-native-firebase/app';import '@react-native-firebase/auth';const auth = firebase.auth();const signIn = async (email: string, pass: string, setUser: any) => {  await auth    .signInWithEmailAndPassword(email, pass)    .then(userCredential => {      var e = userCredential.user;      setUser(e);    })    .catch(error => {      var errorCode = error.code;      var errorMessage = error.message;      console.log(errorCode, errorMessage);    });};

How can I authenticate the user offline using Firebase in React-Native?

Note: online works fine. Code available here: https://gitlab.com/programandoconro/kanjiholic

UPDATE:

I avoided the later problem using:

const init = () => {  firebase.initializeApp({    appId: '****AppID****',    projectId: '***ProjectID***',    persistence: true,  });};

And called this function in my App.tsx:

 useEffect(() => {    init();  }, []);

But still getting the unreachable host problem.