Build, debug, and ship React Native apps, especially Expo-managed projects (Expo SDK, Expo CLI, expo-router, EAS). Use when asked to implement features or fix issues in React Native/Expo: Metro bundler errors, runtime crashes/red screens, iOS/Android native build failures, dependency/version mismatches, deep linking, permissions, push notifications, performance, and testing.
expo start, dev-client, or EAS build?If troubleshooting, request: package.json, app.json/app.config.*, expo doctor output (if available), and the failing command + full log.
pnpm start or npx expo startnpx expo start -cnpx expo run:iosnpx expo run:androidnpx expo doctorreferences/debugging.mdreferences/expo-eas.mdreferences/expo-router.mdreferences/performance.mdreferences/testing.mdscripts/collect_diagnostics.sh