Implement functional repository error recovery with Either/Failure patterns in Flutter. Use when handling exceptions or dartz Either types in data flows; defer UI-only retry buttons.
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@freezed unions (e.g., UnauthorizedFailure, OutOfStockFailure).Either<Failure, T>. No exceptions in UI/BLoC.DioException) and returns Left(Failure). Never rethrow to UI..fold(failure, success) in BLoC to emit corresponding states. Remove try/catch from BLoC.failure.failureMessage (returns TRObject or localized string) for UI-safe text.catch blocks MUST route errors via AppLogger.error(AppException.fromException(e).message, error: e, stackTrace: st) for observability and type-safe UI messages.See implementation examples for repository error mapping and BLoC consumption patterns.
For Failure definitions and API error mapping: See references/REFERENCE.md.
Either and folds; try/catch belongs in Infrastructure@freezed Failure subclasses instead of Left('Something went wrong')Left(Failure) instead of throwing ExceptionAppLogger.error in BLoC/UI catch to ensure Crashlytics tracking and type-safe UI messageslayer-based-clean-architecture | bloc-state-management
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Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
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Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their specific skills.
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Implement WorkManager and background processing correctly on Android. Use when creating Worker classes, scheduling tasks, choosing between WorkManager and Foreground Services, or setting up Hilt in workers; defer FCM and notification delivery to android-notifications.
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Build high-performance declarative UI with Jetpack Compose. Use when writing Composable functions, optimizing recomposition, hoisting state, or working with LazyColumn and side effects; defer deep-link and navigation routing to android-navigation.
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Migrate an Android XML View to Jetpack Compose following a structured 10-step workflow. Use when converting XML layouts to Compose, setting up Compose in an existing View-based project, or incrementally adopting Compose.
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Write correct coroutine scopes, lifecycle collection, and dispatcher injection in Android production code. Use for suspend functions, coroutine scopes, and dispatcher mechanics; defer ViewModel StateFlow/LiveData architecture, Fragment lifecycle recipes, persistence/notifications, and unit-test recipes to their specific skills.
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