react-native-architecture

# React Native Architecture Production-ready patterns for React Native development with Expo, including navigation, state management, native modules, and offline-first architecture. ## When to Use This Skill - Starting a new React Native or Expo project - Implementing complex navigation patterns - Integrating native modules and platform APIs - Building offline-first mobile applications - Optimizing React Native performance - Setting up CI/CD for mobile releases ## Core Concepts ### 1. Project Structure ``` src/ ├── app/ # Expo Router screens │ ├── (auth)/ # Auth group │ ├── (tabs)/ # Tab navigation │ └── _layout.tsx # Root layout ├── components/ │ ├── ui/ # Reusable UI components │ └── features/ # Feature-specific components ├── hooks/ # Custom hooks ├── services/ # API and native services ├── stores/ # State management ├── utils/ # Utilities └── types/ # TypeScript types ``` ### 2. Expo vs Bare React Native | Feature | Expo | Bare RN | | ------------------ | -------------- | -------------- | | Setup complexity | Low | High | | Native modules | EAS Build | Manual linking | | OTA updates | Built-in | Manual setup | | Build service | EAS | Custom CI | | Custom native code | Config plugins | Direct access | ## Quick Start ```bash # Create new Expo project npx create-expo-app@latest my-app -t expo-template-blank-typescript # Install essential dependencies npx expo install expo-router expo-status-bar react-native-safe-area-context npx expo install @react-native-async-storage/async-storage npx expo install expo-secure-store expo-haptics ``` ```typescript // app/_layout.tsx import { Stack } from 'expo-router' import { ThemeProvider } from '@/providers/ThemeProvider' import { QueryProvider } from '@/providers/QueryProvider' export default function RootLayout() { return ( <QueryProvider> <ThemeProvider> <Stack screenOptions={{ headerShown: false }}> <Stack.Screen name="(tabs)" /> <Stack.Screen name="(auth)" /> <Stack.Screen name="modal" options={{ presentation: 'modal' }} /> </Stack> </ThemeProvider> </QueryProvider> ) } ``` ## Detailed patterns and worked examples Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient. ## Best Practices ### Do's - **Use Expo** - Faster development, OTA updates, managed native code - **FlashList over FlatList** - Better performance for long lists - **Memoize components** - Prevent unnecessary re-renders - **Use Reanimated** - 60fps animations on native thread - **Test on real devices** - Simulators miss real-world issues ### Don'ts - **Don't inline styles** - Use StyleSheet.create for performance - **Don't fetch in render** - Use useEffect or React Query - **Don't ignore platform differences** - Test on both iOS and Android - **Don't store secrets in code** - Use environment variables - **Don't skip error boundaries** - Mobile crashes are unforgiving