react-native-dev

A practical guide for building production-ready React Native and Expo applications. Covers UI, animations, state, testing, performance, and deployment. Consult these resources as needed: Then configure: For web support, also install: npx expo install react-native-web react-dom @expo/metro-runtime Consult references before writing : when implementing navigation, lists, networking, or project setup, read the matching reference file above for patterns and pitfalls. Try Expo Go first ( npx expo start ). Custom builds ( eas build ) only needed when using local Expo modules, Apple targets, or third-party native modules not in Expo Go. Conditional rendering : use {count > 0 && } not {count && } (renders "0"). Animation rule : only animate transform and opacity — GPU-composited, no layout thrash. Imports : always import directly from source, not barrel files — avoids bundle bloat.