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firebase 연동 오류 오류 발생 코드 import firebase from "firebase/app"; import 'firebase/auth'; const firebaseConfig = { apiKey: process.env.REACT_APP_APT_KEY, authDomain: process.env.REACT_APP_AUTH_DOMAIN, projectId: process.env.REACT_APP_PROJECT_ID, storageBucket: process.env.REACT_APP_STORAGE_BUCKET, messagingSenderId: process.env.REACT_APP_MESSAGING_SENDER_ID, appId: process.env.REACT_APP_APP_I..