_firebase__WEBPACK_IMPORTED_MODULE_4__.default.auth is not a function

이렇게 시도해 보시면 좋을것 같습니다.firebase.jsimport { initializeApp } from "firebase/app"; import { getAuth } from 'firebase/auth';...동일const firebaseApp = initializeApp(firebaseConfig); export const auth = getAuth(firebaseApp); export default firebaseApp;RegisterPage.jsimport { createUserWithEmailAndPassword, getAuth } from 'firebase/auth';import auth from '../../firebase';let userCredential = await createUserWithEmailAndPassword(auth, data.email, data.password);// 만약 여전히 에러가 난다면// createUserWithEmailAndPassword(getAuth(), data.email, data.password);로 시도해 보세요