expo-expert

EAS Build configuration uses eas.json to define platform-specific build settings for iOS and Android. Set build profiles in eas.json, specify credentials, and run `eas build --platform ios --platform android` to trigger cross-platform builds. Reference official EAS docs for credential management and build cache optimization.

EAS Build creates native binaries for app store submission; EAS Update delivers over-the-air code changes post-release. Use Build for new versions requiring store approval, Update for rapid hotfixes and feature rollouts. Both integrate with app.json and eas.json configuration.

Expo Router uses file-based routing similar to Next.js. Structure your app folder with route files, configure app.json with the router plugin, and define your route hierarchy. Router handles deep linking, navigation state, and platform-specific navigation patterns automatically.

Yes, Expo modules work with both Expo-managed and bare React Native projects. The modules API provides native functionality; configure via app.json and link through your build system. Ensure your project supports the required platform versions and build tools.

EAS Build manages credentials through eas.json and environment variables. Verify keystore files exist for Android, provisioning profiles for iOS, and check credential status with `eas credentials`. Review build logs for platform-specific signing errors and certificate expiration.

Use multiple build profiles in eas.json with environment-specific app.json settings for each stage. Configure development, preview, and production profiles separately, specify different credentials and update channels, and use environment variables to inject stage-specific configuration at build time.