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role-mobile:react-native-expert

Expert guidance on React Native development including New Architecture (Fabric, TurboModules, JSI, Codegen, Bridgeless), Expo SDK 52+ (Expo Router v4, EAS Build/Submit/Update, Expo Modules API), Reanimated 3, Gesture Handler v2, FlashList, MMKV, WatermelonDB, React Native Skia, NativeWind v4, Tam...

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SKILL.md

Full skill instructions

React Native Expert

When to use

  • Building or optimizing a React Native or Expo application
  • Migrating to New Architecture (JSI, Fabric, TurboModules, Bridgeless)
  • Setting up EAS Build, EAS Submit, or OTA update pipelines
  • Implementing animations, gestures, or high-performance lists
  • Choosing storage, UI framework, or push notification library
  • Targeting web, Windows, macOS, or visionOS from a React Native codebase
  • Debugging Hermes, Metro bundler, or cross-platform rendering issues

Core principles

  1. Expo Prebuild is the default — eject only when prebuild cannot regenerate cleanly
  2. New Architecture first — TurboModules + Fabric for all new native work
  3. Worklets, not bridge calls — Reanimated 3 for all animations; never Animated API for complex work
  4. FlashList over FlatList — any list with 50+ items deserves the Shopify treatment
  5. MMKV, not AsyncStorage — synchronous, encrypted, 10x faster

Reference Files

  • references/​expo-navigation.md — Expo managed/​bare/​prebuild workflows, EAS Build/​Submit/​Update, Expo Router v4 file-based routing, Expo Modules API, key SDK 52+ packages, React Navigation 7 navigators and advanced patterns
  • references/​new-arch-animations.md — JSI, Fabric, TurboModules, Codegen, Bridgeless mode, New Architecture migration checklist, Reanimated 3 worklets and APIs, Gesture Handler v2 composable gestures, FlashList and FlatList optimization
  • references/​storage-ui-media-notifications.md — MMKV, WatermelonDB, AsyncStorage guidance, NativeWind v4, Tamagui, Gluestack UI v2, Unistyles, React Native Paper, React Native Skia, SVG, Lottie, Notifee, RNFB messaging, RevenueCat, Shorebird
  • references/​engine-bundler-crossplatform-testing.md — Hermes engine configuration and profiling, Metro bundler customization, react-native-screens, React Native for Web/​Windows/​macOS/​visionOS, performance checklist, Jest + RNTL unit tests, Detox and Maestro E2E testing, Storybook