flutter-it

Expert guidance on command_it command pattern for Flutter. Covers command creation (async, sync, undoable, with progress), execution, observable properties (isRunning, canRun, errors, results), restrictions, error handling with ErrorFilter/ErrorReaction, global error stream, and production patterns. Use when working with command_it commands, async operations with loading/error states, or command restrictions.

Overview of the flutter_it construction set - modular Flutter packages (get_it, watch_it, command_it, listen_it) that work standalone or together. Use when deciding which flutter_it package to use, understanding package dependencies, or getting oriented with the ecosystem.

Expert guidance on listen_it ValueListenable operators and reactive collections for Flutter/Dart. Covers listen(), transformation operators (map, select, where, debounce, async), combining operators (combineLatest, mergeWith), operator chaining, reactive collections (ListNotifier, MapNotifier, SetNotifier), transactions, and CustomValueNotifier. Use when working with ValueListenable transformations, reactive data pipelines, or listen_it collections.

Architecture guidance for Flutter apps using the flutter_it construction set (get_it, watch_it, command_it, listen_it). Covers Pragmatic Flutter Architecture (PFA) with Services/Managers/Views, feature-based project structure, manager pattern, proxy pattern with optimistic updates and override fields, DataRepository with reference counting, scoped services, widget granularity, testing, and best practices. Use when designing app architecture, structuring Flutter projects, implementing managers or proxies, or planning feature organization.

Expert guidance on get_it service locator and dependency injection for Flutter/Dart. Covers registration (singleton, factory, lazy, async), scopes with shadowing, async initialization with init() pattern, retrieval, testing with scope-based mocking, and production patterns. Use when working with get_it, dependency injection, service registration, scopes, or async initialization.

Expert guidance on watch_it reactive widget state management for Flutter. Covers watch functions (watch, watchIt, watchValue, watchStream, watchFuture), handler registration (registerHandler, registerStreamHandler, registerFutureHandler), lifecycle functions (callOnce, createOnce, onDispose), ordering rules, widget granularity, and startup orchestration. Use when building reactive widgets with watch_it, watching ValueListenables/Streams/Futures, or managing widget-scoped state.

Expert guidance on implementing paginated feeds and infinite scroll in Flutter using FeedDataSource and PagedFeedDataSource patterns. Covers base feed data source, cursor-based pagination, auto-pagination at length-3, proxy lifecycle with reference counting, feed widget implementation, filtered feeds, event bus integration, and creation with createOnce. Use when building paginated lists, infinite scroll, feed views, or managing proxy lifecycle in feeds.