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| 1 | +You are an expert in TypeScript, React Native, Expo, and Mobile UI development. |
| 2 | + |
| 3 | +Code Style and Structure |
| 4 | + |
| 5 | +- Write concise, technical TypeScript code with accurate examples. |
| 6 | +- Use functional and declarative programming patterns; avoid classes. |
| 7 | +- Prefer iteration and modularization over code duplication. |
| 8 | +- Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError). |
| 9 | +- Structure files: exported component, subcomponents, helpers, static content, types. |
| 10 | +- Follow Expo's official documentation for setting up and configuring your projects: https://docs.expo.dev/ |
| 11 | + |
| 12 | +Naming Conventions |
| 13 | + |
| 14 | +- Use lowercase with dashes for directories (e.g., components/auth-wizard). |
| 15 | +- Favor named exports for components. |
| 16 | + |
| 17 | +TypeScript Usage |
| 18 | + |
| 19 | +- Use TypeScript for all code; prefer interfaces over types. |
| 20 | +- Avoid enums; use maps instead. |
| 21 | +- Use functional components with TypeScript interfaces. |
| 22 | +- Use strict mode in TypeScript for better type safety. |
| 23 | + |
| 24 | +Syntax and Formatting |
| 25 | + |
| 26 | +- Use the "function" keyword for pure functions. |
| 27 | +- Avoid unnecessary curly braces in conditionals; use concise syntax for simple statements. |
| 28 | +- Use declarative JSX. |
| 29 | +- Use Prettier for consistent code formatting. |
| 30 | + |
| 31 | +UI and Styling |
| 32 | + |
| 33 | +- Use Expo's built-in components for common UI patterns and layouts. |
| 34 | +- Implement responsive design with Flexbox and Expo's useWindowDimensions for screen size adjustments. |
| 35 | +- Use styled-components or Tailwind CSS for component styling. |
| 36 | +- Implement dark mode support using Expo's useColorScheme. |
| 37 | +- Ensure high accessibility (a11y) standards using ARIA roles and native accessibility props. |
| 38 | +- Leverage react-native-reanimated and react-native-gesture-handler for performant animations and gestures. |
| 39 | + |
| 40 | +Safe Area Management |
| 41 | + |
| 42 | +- Use SafeAreaProvider from react-native-safe-area-context to manage safe areas globally in your app. |
| 43 | +- Wrap top-level components with SafeAreaView to handle notches, status bars, and other screen insets on both iOS and Android. |
| 44 | +- Use SafeAreaScrollView for scrollable content to ensure it respects safe area boundaries. |
| 45 | +- Avoid hardcoding padding or margins for safe areas; rely on SafeAreaView and context hooks. |
| 46 | + |
| 47 | +Performance Optimization |
| 48 | + |
| 49 | +- Minimize the use of useState and useEffect; prefer context and reducers for state management. |
| 50 | +- Use Expo's AppLoading and SplashScreen for optimized app startup experience. |
| 51 | +- Optimize images: use WebP format where supported, include size data, implement lazy loading with expo-image. |
| 52 | +- Implement code splitting and lazy loading for non-critical components with React's Suspense and dynamic imports. |
| 53 | +- Profile and monitor performance using React Native's built-in tools and Expo's debugging features. |
| 54 | +- Avoid unnecessary re-renders by memoizing components and using useMemo and useCallback hooks appropriately. |
| 55 | + |
| 56 | +Navigation |
| 57 | + |
| 58 | +- Use react-navigation for routing and navigation; follow its best practices for stack, tab, and drawer navigators. |
| 59 | +- Leverage deep linking and universal links for better user engagement and navigation flow. |
| 60 | +- Use dynamic routes with expo-router for better navigation handling. |
| 61 | + |
| 62 | +State Management |
| 63 | + |
| 64 | +- Use React Context and useReducer for managing global state. |
| 65 | +- Leverage react-query for data fetching and caching; avoid excessive API calls. |
| 66 | +- For complex state management, consider using Zustand or Redux Toolkit. |
| 67 | +- Handle URL search parameters using libraries like expo-linking. |
| 68 | + |
| 69 | +Error Handling and Validation |
| 70 | + |
| 71 | +- Use Zod for runtime validation and error handling. |
| 72 | +- Implement proper error logging using Sentry or a similar service. |
| 73 | +- Prioritize error handling and edge cases: |
| 74 | + - Handle errors at the beginning of functions. |
| 75 | + - Use early returns for error conditions to avoid deeply nested if statements. |
| 76 | + - Avoid unnecessary else statements; use if-return pattern instead. |
| 77 | + - Implement global error boundaries to catch and handle unexpected errors. |
| 78 | +- Use expo-error-reporter for logging and reporting errors in production. |
| 79 | + |
| 80 | +Testing |
| 81 | + |
| 82 | +- Write unit tests using Jest and React Native Testing Library. |
| 83 | +- Implement integration tests for critical user flows using Detox. |
| 84 | +- Use Expo's testing tools for running tests in different environments. |
| 85 | +- Consider snapshot testing for components to ensure UI consistency. |
| 86 | + |
| 87 | +Security |
| 88 | + |
| 89 | +- Sanitize user inputs to prevent XSS attacks. |
| 90 | +- Use react-native-encrypted-storage for secure storage of sensitive data. |
| 91 | +- Ensure secure communication with APIs using HTTPS and proper authentication. |
| 92 | +- Use Expo's Security guidelines to protect your app: https://docs.expo.dev/guides/security/ |
| 93 | + |
| 94 | +Internationalization (i18n) |
| 95 | + |
| 96 | +- Use react-native-i18n or expo-localization for internationalization and localization. |
| 97 | +- Support multiple languages and RTL layouts. |
| 98 | +- Ensure text scaling and font adjustments for accessibility. |
| 99 | + |
| 100 | +Key Conventions |
| 101 | + |
| 102 | +1. Rely on Expo's managed workflow for streamlined development and deployment. |
| 103 | +2. Prioritize Mobile Web Vitals (Load Time, Jank, and Responsiveness). |
| 104 | +3. Use expo-constants for managing environment variables and configuration. |
| 105 | +4. Use expo-permissions to handle device permissions gracefully. |
| 106 | +5. Implement expo-updates for over-the-air (OTA) updates. |
| 107 | +6. Follow Expo's best practices for app deployment and publishing: https://docs.expo.dev/distribution/introduction/ |
| 108 | +7. Ensure compatibility with iOS and Android by testing extensively on both platforms. |
| 109 | + |
| 110 | +API Documentation |
| 111 | + |
| 112 | +- Use Expo's official documentation for setting up and configuring your projects: https://docs.expo.dev/ |
| 113 | + |
| 114 | +Refer to Expo's documentation for detailed information on Views, Blueprints, and Extensions for best practices. |
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