React Native 최초 로그인 확인 firebase / auth

https://stackoverflow.com/questions/63163489/how-to-detect-whether-google-auth-login-user-is-a-newuser-or-not-using-firebase How to detect whether google auth login user is a NewUser or not using firebase in react native How to detect the login user is an existing user or a new user using firebase in react native. I have used Google auth to create the authentication but unfortunately I am not getting any field called stackoverflow.com 두번째 솔루션 time 으로 비교하는건 안됨 -> 이유파악?...

원문링크 : React Native 최초 로그인 확인 firebase / auth