Use when building or debugging React Native apps - files using .tsx with react-native imports, app.json/app.config.ts, expo-router app/ directories, metro.config.js, eas.json, or mentions of Expo, Fabric, TurboModules, Reanimated, FlashList, or Maestro. Builds screens and navigation with Expo Router, integrates native modules, optimizes lists and animations, sets up EAS Build/Update, and writes Jest/RNTL and Maestro tests. Invoke for navigation and deep linking, New Architecture migration, list/animation performance, platform-specific code, native module authoring, and release pipeline setup.
