sealed_exceptions.dart

void main() {
  printUserAttributes();
}

Future<void> printUserAttributes() async {
  try {
    final attributes = await Amplify.Auth.fetchUserAttributes();
    safePrint('User attributes: $attributes');
  } on AuthException catch (e) {
    switch (e) {
      case AuthNotAuthorizedException _:
      case SessionExpiredException _:
        safePrint('Session is invalid: $e');
      case _:
        safePrint('An unknown error occurred: $e');
  }
}