dart-flutter-patterns

Use this skill when: This skill provides copy-paste-ready Dart/Flutter code patterns organized by concern: Practical, production-ready patterns for Dart and Flutter applications. Library-agnostic where possible, with explicit coverage of the most common ecosystem packages. - Starting a new Flutter feature and need idiomatic patterns for state management, navigation, or data access - Reviewing or writing Dart code and need guidance on null safety, sealed types, or async composition - Setting up a new Flutter project and choosing between BLoC, Riverpod, or Provider - Implementing secure HTTP clients, WebView integration, or local storage - Writing tests for Flutter widgets, Cubits, or Riverpod providers - Wiring up GoRouter with authentication guards - Null safety — avoid ! , prefer ?. / ?? /pattern matching - Immutable state — sealed classes, freezed , copyWith - Async composition — concurrent Future.wait , safe BuildContext after await - Widget architecture — extract to classes (not methods), const propagation, scoped rebuilds - State management — BLoC/Cubit events, Riverpod notifiers and derived providers - Navigation — GoRouter with reactive auth guards via refreshListenable - Networking — Dio with interceptors, token refresh with one-time retry guard - Error handling — global capture, ErrorWidget.builder , crashlytics wiring - Testing — unit (BLoC test), widget...