flutter-freezedlisted

# Flutter Freezed Generate immutable data classes and union types using the Freezed package. --- ## Installation ```bash # required flutter pub add freezed_annotation flutter pub add dev:freezed flutter pub add dev:build_runner # for JSON serialization flutter pub add json_annotation flutter pub add dev:json_serializable ``` ## Code Generation ```bash # one-time build dart run build_runner build --delete-conflicting-outputs # watch mode dart run build_runner watch --delete-conflicting-outputs ``` --- ## Quick Reference ```dart // basic immutable class @freezed abstract class User with _$User { const factory User({required String name}) = _User; factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json); } // Union Type (sealed) @freezed sealed class State with _$State { const factory State.loading() = StateLoading; const factory State.data(String value) = StateData; const factory State.error(Exception e) = StateError; } // usage final user = User(name: 'Kim'); final copy = user.copyWith(name: 'Lee'); final json = user.toJson(); // pattern matching switch (state) { StateLoading() => print('loading'), StateData(:final value) => print(value), StateError(:final e) => print(e), } ``` --- ## Common Issues | Issue | Fix | |------|------| | Missing `part` file error | Run `dart run build_runner build` | | Changes not reflected | Add the `--delete-conflicting-outputs` flag | | Cannot add methods | Add a `const ClassName._();` private cons