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react-general

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General React and React Native engineering rules for Ledger Live. Read when writing or reviewing any .ts/.tsx file.

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General React & React Native Patterns

These rules apply to all files, including those inside src/mvvm/. See mvvm-architecture for MVVM-specific structure.

Component Architecture

  • Prefer functional components.
  • Keep components focused and reasonably sized.
  • Decompose large UI into smaller reusable elements.
  • Use composition for extensibility.

State Management

  • Prioritize local state for UI-only concerns.
  • Use RTK Query (with slices) only when necessary for app-wide state. See rtk-query-api.
  • Apply optimized selectors to limit re-rendering.
  • Connect Redux at the lowest component level when possible.

Styling

  • Mobile: use Lumen UI React Native — see ldls-native.
  • Desktop: use Lumen UI React — see ldls-web.
  • All styles must support theme switching (dark/light mode).

Performance

  • Memoize expensive operations with useMemo.
  • Stabilize callbacks with useCallback.
  • Wrap costly components in React.memo.
  • Apply list virtualization where needed.
  • Use lazy loading for large screens or modules.

Navigation

  • Mobile: use React Navigation; ensure correct deep-link support; keep navigation types strict.
  • Desktop: use React Router; implement route guards when necessary; maintain clear history logic.

Data Fetching

  • Use RTK Query. See rtk-query-api.
  • Use consistent loading, retry, and error states.
  • Prefer optimistic UI when appropriate.
  • Apply caching and stale-time strategies.

Accessibility

  • Mobile: provide accessible labels for all interactive elements; support screen reader flows; ensure proper focus transitions.
  • Desktop: use semantic HTML tags; implement full keyboard navigation; apply meaningful ARIA attributes when required.

Error Boundaries

  • Wrap critical areas in error boundaries.
  • Report errors to monitoring services.
  • Provide clean, user-friendly fallback UIs.

Platform-Specific Code

  • React Native: use Platform.select for small platform variations; ensure behavior parity across iOS and Android.
  • Desktop: use environment flags for Electron/Web differences; keep platform abstraction consistent.

Animations

  • Mobile: use the native driver whenever feasible; prefer Animated and layout animations for performance.
  • Desktop: use CSS transitions for lightweight animations; use Framer Motion for complex animations; respect reduced-motion system preferences.

Internationalization (i18n)

  • Use react-i18next consistently.
  • Keep translation keys descriptive and structured.
  • Support pluralization, gender, and variable interpolation.
  • Validate components across multiple locales.