--- name: expo description: "Managed workflow for cross-platform mobile apps with EAS. Trigger: When developing with Expo, configuring EAS services, or building mobile apps." license: "Apache 2.0" metadata: version: "1.0" skills: - react-native - typescript - a11y dependencies: expo: ">=50.0.0 <51.0.0" react-native: ">=0.73.0 <1.0.0" react: ">=18.0.0 <19.0.0" allowed-tools: - file-reader --- # Expo Skill ## Overview This skill provides guidance for developing cross-platform mobile applications using Expo, covering setup, development workflow, native features, and deployment. ## Objective Enable developers to build, test, and deploy mobile applications efficiently using Expo's managed workflow with proper TypeScript support and React Native best practices. --- ## When to Use Use this skill when: - Building cross-platform mobile apps (iOS + Android) - Using Expo managed workflow - Configuring EAS Build or EAS Update - Accessing native features via Expo SDK - Deploying OTA updates Don't use this skill for: - Bare React Native projects (use react-native skill) - Web-only applications - Custom native modules not supported by Expo --- ## Critical Patterns ### ✅ REQUIRED: Use Expo SDK for Native Features ```typescript // ✅ CORRECT: Expo SDK modules import * as Location from "expo-location"; import { Camera } from "expo-camera"; // ❌ WRONG: Direct React Native linking (use Expo modules) import { NativeModules } from "react-native"; ``` ### ✅ REQUIRED: Handle Permissions Properly ```typescript // ✅ CORRECT: Request permissions before using const { status } = await Location.requestForegroundPermissionsAsync(); if (status === "granted") { const location = await Location.getCurrentPositionAsync(); } // ❌ WRONG: No permission check const location = await Location.getCurrentPositionAsync(); // May crash ``` ### ✅ REQUIRED: Use TypeScript ```typescript // ✅ CORRECT: Typed props and state interface Props { title: string; } const Component: React.FC = ({ title }) => { const [count, setCount] = useState(0); }; ``` --- ## Conventions - Use TypeScript for type safety - Follow React Native component patterns - Leverage Expo SDK for native features - Use Expo Go for development testing - Implement proper error handling for native features --- ## Decision Tree **Need native feature?** → Check Expo SDK first, use managed module if available. **Custom native code needed?** → Use config plugins or eject to bare workflow. **Building for stores?** → Use EAS Build for cloud builds. **Need OTA updates?** → Use EAS Update for instant app updates. **Platform-specific code?** → Use `Platform.select()` or `.ios.tsx`/`.android.tsx` files. **Testing?** → Use Expo Go for development, physical devices or simulators for final testing. **Navigation?** → Use Expo Router or React Navigation. --- ## Example ```typescript import { StatusBar } from 'expo-status-bar'; import { StyleSheet, Text, View } from 'react-native'; export default function App() { return ( Welcome to Expo ); } const styles = StyleSheet.create({ container: { flex: 1, backgroundColor: '#fff', alignItems: 'center', justifyContent: 'center', }, }); ``` ## Edge Cases - Handle platform-specific code with Platform API - Manage permissions properly - Test on both iOS and Android - Handle offline scenarios ## References - https://docs.expo.dev/ - https://reactnative.dev/

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