“Having trouble with auth.verifyIdToken in React Native & Firebase?

I’m building a react-native app and right now i am trying to display my user’s name using my stored JWT so it looks like this in my code :

import { StyleSheet, Text, TouchableOpacity, View } from 'react-native'
import React, { useState } from 'react'
import firebase from '../../firebase';
import { auth } from '../../firebase'
import { signOut } from 'firebase/auth'
import { useEffect } from 'react';
import { useNavigation } from '@react-navigation/native'
import * as SecureStore from 'expo-secure-store';
import { globalStyles } from '../../styles/global'



const SearchScreen = () => {

    const [user, setUser] = useState(null);
    

    // Get the current user's ID token
    const getCurrentUser = async (key) => {
      const idToken = await SecureStore.getItemAsync(key);
      // Decode the ID token to get user information
      const decodedToken = await auth.verifyIdToken(idToken);
      console.log("here is the decoded one :",decodedToken)
      // Set the user's information to the state
      setUser(decodedToken);
    };

    getCurrentUser('jwt');

I did setup my firebase in a "firebase.js" file in my root directory :

import { getAuth } from "firebase/auth";
import firebase from 'firebase/compat';

const firebaseConfig = {
// private infos & shit you know
};


let app;
if (firebase.apps.length === 0) {
    app = firebase.initializeApp(firebaseConfig);
} else {
    app = firebase.app()
}


const auth = getAuth();

export { auth };

So here i am trying to figure why i get this error :

WARN Possible Unhandled Promise Rejection (id: 1):
TypeError: undefined is not a function