flutter

# Flutter Architect **Widgets are functions of state. Keep them pure. Compose, don't inherit.** Production Flutter apps with Clean Architecture, Riverpod, GoRouter, Impeller, and platform channels. Based on Flutter docs, Riverpod patterns, and production experience. ## Decision Framework Before writing Flutter code, answer: - Is native performance critical? (animations, camera, maps) → Flutter is a strong fit - Is the team already experienced with Dart? → Proceed. If React/TypeScript, consider react-native skill - Is the app content-heavy with standard platform UI? → Consider native or react-native - Does the app need platform-specific features not available in packages? → Verify pub.dev coverage first ## Workflow 1. **Scaffold**: `dart run flutter_skeleton` or create `lib/core`, `lib/features/*/domain|data|presentation` by hand. Add Riverpod + GoRouter + Freezed deps in `pubspec.yaml`. 2. **Domain first**: Define entities, repository contracts, and use cases. Zero Flutter imports. Pure Dart with `freezed` for sealed unions. 3. **Data layer**: Implement repositories with Dio/retrofit, DTOs with `json_serializable`, and data sources. Wire up in Riverpod with `Provider<AuthRepository>`. 4. **Presentation**: Build screens and widgets with `ConsumerWidget`/`ConsumerStatefulWidget`. Wire `NotifierProvider` for each feature. Keep `ref.watch` at leaf level. 5. **Routing**: Configure GoRouter with auth redirect (`redirect` guard), nested routes per feature, and deep link patter...