I have no idea why this error happens... but I suspect this file causes something?? Especially, firebaseAuth={getAuth(app)} might be a problem. Before that, const app = initializeApp(firebaseConfig); is defined in "../firebase/firebase"

import React from "react";
import StyledFirebaseAuth from "react-firebaseui/StyledFirebaseAuth";
import { app } from "../firebase/firebase";
import { getAuth, createUserWithEmailAndPassword, EmailAuthProvider, GoogleAuthProvider, GithubAuthProvider } from "firebase/auth";

// Configure FirebaseUI.
const uiConfig = {
  signInFlow: 'popup',
  signInSuccessUrl: "/",
  signInOptions: [
    EmailAuthProvider.PROVIDER_ID,
    GoogleAuthProvider.PROVIDER_ID,
    GithubAuthProvider.PROVIDER_ID,
  ],
};

export default function SignInScreen() {
  return (
    <div>
      <h1>PolygonHR Login</h1>
      <p>Please sign-in:</p>
      <StyledFirebaseAuth uiConfig={uiConfig} firebaseAuth={getAuth(app)} />
    </div>
  );
}