How do you check if a user is Realated in flutter firebase?

How do I detect if a user is already logged in Firebase?

Check if user is logged in Firebase Auth provides you with a current user to check. They keep track of the login status on disk so you can simply check if the user is null or not to confirm if we’re logged in. Open up the AuthenticationService and add a new function that returns a type Future<bool> .

When to check if the user is logged in?