Updated and *way simpler* APIs

example/lib/entities/auth.dart

@@ -5,13 +5,17 @@ part 'auth.freezed.dart';
 /// Authentication class for this sample application.
 /// It should be self-explanatory.
 @freezed
-class Auth with _$Auth {
+sealed class Auth with _$Auth {
   const factory Auth.signedIn({
     required int id,
     required String displayName,
     required String email,
     required String token,
   }) = SignedIn;
-
+  const Auth._();
   const factory Auth.signedOut() = SignedOut;
+  bool get isAuth => switch (this) {
+        SignedIn() => true,
+        SignedOut() => false,
+      };
 }