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SKILL.md

name flutter-dev
description Flutter cross-platform development guide covering widget patterns, Riverpod/Bloc state management, GoRouter navigation, performance optimization, and platform-specific implementations. Includes const optimization, responsive layouts, testing strategies, and DevTools profiling. Use when: building Flutter apps, implementing state management (Riverpod/Bloc), setting up GoRouter navigation, creating custom widgets, optimizing performance, writing widget tests, cross-platform development.
license MIT
metadata [object Object]

Flutter Development Guide

A practical guide for building cross-platform applications with Flutter 3 and Dart. Focuses on proven patterns, state management, and performance optimization.

Quick Reference

Widget Patterns

Purpose Component
State management (simple) StateProvider + ConsumerWidget
State management (complex) NotifierProvider / Bloc
Async data FutureProvider / AsyncNotifierProvider
Real-time streams StreamProvider
Navigation GoRouter + context.go/push
Responsive layout LayoutBuilder + breakpoints
List display ListView.builder
Complex scrolling CustomScrollView + Slivers
Hooks HookWidget + useState/useEffect
Forms Form + TextFormField + validation

Performance Patterns

Purpose Solution
Prevent rebuilds const constructors
Selective updates ref.watch(provider.select(...))
Isolate repaints RepaintBoundary
Lazy lists ListView.builder
Heavy computation compute() isolate
Image caching cached_network_image

Core Principles

Widget Optimization

  • Use const constructors wherever possible
  • Extract static widgets to separate const classes
  • Use Key for list items (ValueKey, ObjectKey)
  • Prefer ConsumerWidget over StatefulWidget for state

State Management

  • Riverpod for dependency injection and simple state
  • Bloc/Cubit for event-driven workflows and complex logic
  • Never mutate state directly (create new instances)
  • Use select() to minimize rebuilds

Layout

  • 8pt spacing increments (8, 16, 24, 32, 48)
  • Responsive breakpoints: mobile (<650), tablet (650-1100), desktop (>1100)
  • Support all screen sizes with flexible layouts
  • Follow Material 3 / Cupertino design guidelines

Performance

  • Profile with DevTools before optimizing
  • Target <16ms frame time for 60fps
  • Use RepaintBoundary for complex animations
  • Offload heavy work with compute()

Checklist

Widget Best Practices

  • const constructors on all static widgets
  • Proper Key on list items
  • ConsumerWidget for state-dependent widgets
  • No widget building inside build() method
  • Extract reusable widgets to separate files

State Management

  • Immutable state objects
  • select() for granular rebuilds
  • Proper provider scoping
  • Dispose controllers and subscriptions
  • Handle loading/error states

Navigation

  • GoRouter with typed routes
  • Auth guards via redirect
  • Deep linking support
  • State preservation across routes

Performance

  • Profile mode testing (flutter run --profile)
  • <16ms frame rendering time
  • No unnecessary rebuilds (DevTools check)
  • Images cached and resized
  • Heavy computation in isolates

Testing

  • Widget tests for UI components
  • Unit tests for business logic
  • Integration tests for user flows
  • Bloc tests with blocTest()

References

Topic Reference
Widget patterns, const optimization, responsive layout Widget Patterns
Riverpod providers, notifiers, async state Riverpod State Management
Bloc, Cubit, event-driven state Bloc State Management
GoRouter setup, routes, deep linking GoRouter Navigation
Feature-based structure, dependencies Project Structure
Profiling, const optimization, DevTools Performance Optimization
Widget tests, integration tests, mocking Testing Strategies
iOS/Android/Web specific implementations Platform Integration
Implicit/explicit animations, Hero, transitions Animations
Dio, interceptors, error handling, caching Networking
Form validation, FormField, input formatters Forms
i18n, flutter_localizations, intl Localization

Flutter, Dart, Material Design, and Cupertino are trademarks of Google LLC and Apple Inc. respectively. Riverpod, Bloc, and GoRouter are open-source packages by their respective maintainers.