32. ChatGPT에게 물었습니다.auth.onAuthStateChanged() 설명해줘.The auth.onAuthStateChanged() method is a crucial part of Firebase Authentication. It is an event listener that triggers whenever there is a change in the authentication state of the user. This can include events such as a user signing in, signing out, or the current user's ID token being refreshed.auth.onAuthStateChanged() 메소드는 Firebase 인증의 중요한..