# React Native Skills
Comprehensive best practices for React Native and Expo applications. Contains rules across multiple categories covering performance, animations, UI patterns, and platform-specific optimizations.
When to Apply
Reference these guidelines when:
- Building React Native or Expo apps
- Optimizing list and scroll performance
- Implementing animations with Reanimated
- Working with images and media
- Configuring native modules or fonts
- Structuring monorepo projects with native dependencies
Rule Categories by Priority
| Priority | Category | Impact | Prefix | | -------- | ---------------- | -------- | -------------------- | | 1 | List Performance | CRITICAL | `list-performance-` | | 2 | Animation | HIGH | `animation-` | | 3 | Navigation | HIGH | `navigation-` | | 4 | UI Patterns | HIGH | `ui-` | | 5 | State Management | MEDIUM | `react-state-` | | 6 | Rendering | MEDIUM | `rendering-` | | 7 | Monorepo | MEDIUM | `monorepo-` | | 8 | Configuration | LOW | `fonts-`, `imports-` |
Quick Reference
1. List Performance (CRITICAL)
- `list-performance-virtualize` - Use FlashList for large lists
- `list-performance-item-memo` - Memoize list item components
- `list-performance-callbacks` - Stabilize callback references
- `list-performance-inline-objects` - Avoid inline style objects
- `list-performance-function-references` - Extract functions outside render
- `list-performance-images` - Optimize images in lists
- `list-performance-item-expensive` - Move expensive work outside items
- `list-performance-item-types` - Use item types for heterogeneous lists
2. Animation (HIGH)
- `animation-gpu-properties` - Animate only transform and opacity
- `animation-derived-value` - Use useDerivedValue for computed animations
- `animation-gesture-detector-press` - Use Gesture.Tap instead of Pressable
3. Navigation (HIGH)
- `navigation-native-navigators` - Use native stack and native tabs over JS navigators
4. UI Patterns (HIGH)
- `ui-expo-image` - Use expo-image for all images
- `ui-image-gallery` - Use Galeria for image lightboxes
- `ui-pressable` - Use Pressable over TouchableOpacity
- `ui-safe-area-scroll` - Handle safe areas in ScrollViews
- `ui-scrollview-content-inset` - Use contentInset for headers
- `ui-menus` - Use native context menus
- `ui-native-modals` - Use native modals when possible
- `ui-measure-views` - Use onLayout, not measure()
- `ui-styling` - Use StyleSheet.create or Nativewind
5. State Management (MEDIUM)
- `react-state-minimize` - Minimize state subscriptions
- `react-state-dispatcher` - Use dispatcher pattern for callbacks
- `react-state-fallback` - Show fallback on first render
- `react-compiler-destructure-functions` - Destructure for React Compiler
- `react-compiler-reanimated-shared-values` - Handle shared values with compiler
6. Rendering (MEDIUM)
- `rendering-text-in-text-component` - Wrap text in Text components
- `rendering-no-falsy-and` - Avoid falsy && for conditional rendering
7. Monorepo (MEDIUM)
- `monorepo-native-deps-in-app` - Keep native dependencies in app package
- `monorepo-single-dependency-versions` - Use single versions across packages
8. Configuration (LOW)
- `fonts-config-plugin` - Use config plugins for custom fonts
- `imports-design-system-folder` - Organize design system imports
- `js-hoist-intl` - Hoist Intl object creation
How to Use
Read individual rule files for detailed explanations and code examples:
``` rules/list-performance-virtualize.md rules/animation-gpu-properties.md ```
Each rule file contains:
- Brief explanation of why it matters
- Incorrect code example with explanation
- Correct code example with explanation
- Additional context and references
Full Compiled Document
For the complete guide with all rules expanded: `AGENTS.md`