Cleanup

packages/freezed/migration_guide.md

@@ -1,8 +1,6 @@
-# Migration Guide
-
 ## Migrate from v2 to v3
 
-### Require keyword (`sealed` / `abstract`) 
+### Require keyword (`sealed` / `abstract`)
 
 Classes using the factory constructor now require a keyword `sealed` / `abstract`.
 
@@ -47,45 +45,3 @@ final model = Model.first('42');
 +};
 
 ```
-
-
-### Classic classes (new)
-
-Instead of primary constructors, you can write normal Dart classes.
-
-In this scenario, write a typical constructor + fields combo as you normally would:
-
-```dart
-import 'package:freezed_annotation/freezed_annotation.dart';
-
-// required: associates our `main.dart` with the code generated by Freezed
-part 'main.freezed.dart';
-// optional: Since our Person class is serializable, we must add this line.
-// But if Person was not serializable, we could skip it.
-part 'main.g.dart';
-
-@freezed
-@JsonSerializable() // needed for class serialization
-class Person with _$Person {
-  const Person({
-    required this.firstName,
-    required this.lastName,
-    required this.age,
-  });
-
-  final String firstName;
-  final String lastName;
-  final int age;
-
-  factory Person.fromJson(Map<String, Object?> json)
-      => _$PersonFromJson(json);
-
-  Map<String, Object?> toJson() => _$PersonToJson(this);
-}
-```
-
-In this scenario, Freezed will generate `copyWith`/`toString`/`==`/`hashCode`,
-but won't do anything related to JSON encoding (hence why you need to manually add `@JsonSerializable`).
-
-This syntax has the benefit of enabling advanced constructor logic, such as
-inheritance or non-constant default values.