颤振不可为空

Question

I have a error The non-nullable local variable 'firebaseUser' must be assigned before it can be used. Try giving it an initializer expression

My code

if (firebaseUser != null) {
  saveUserInfoToFirestore(firebaseUser).then((value) {
    Navigator.pop(context);
    Route route = MaterialPageRoute(builder: (c) => StoreHome());
    Navigator.pushReplacement(context, route);
  });
}

Answer 1

Checking a non-nullable variable to be null, is like say to a man with no legs he should run.

I guess you have something like this:

User firebaseUser = FirebaseAuth.instance.currentUser;

So if you want to check about null, you have to make it nullable first. Doing so with "?"after the typedeclaration.

User? firebaseUser = FirebaseAuth.instance.currentUser;

For more info: https://dart.dev/null-safety