CLAUDE.md — React Native (Expo)

Commands

• npx expo start — start dev server
• npx expo run:ios — run on iOS simulator
• npx expo run:android — run on Android emulator
• npm test — run tests

Code Style

• Use TypeScript for all files
• Use React Navigation for routing
• Use Zustand for state management
• Use React Query for server state
• Use StyleSheet.create for styles (not inline objects)
• Use Expo modules over bare React Native where available

Platform Differences

• Use Platform.select or Platform.OS for platform-specific code
• Test on both iOS and Android
• Use SafeAreaView for notch handling
• Use KeyboardAvoidingView for forms

Performance

• Use FlatList for long lists (never ScrollView)
• Use React.memo for list items
• Minimize re-renders with useCallback
• Use Hermes engine (default in Expo)
• Avoid large images — use expo-image for caching