--- name: expo-configuration description: Expo SDK configuration and setup. Use when configuring Expo projects. --- # Expo Configuration Skill This skill covers Expo SDK configuration for React Native projects. ## When to Use Use this skill when: - Setting up a new Expo project - Configuring app.json/app.config.js - Adding native modules - Configuring build settings ## Core Principle **MANAGED WORKFLOW** - Use Expo's managed workflow for best developer experience. ## Project Initialization ```bash # Create new Expo project npx create-expo-app@latest my-app # With specific template npx create-expo-app@latest my-app --template tabs ``` ## App Configuration ### app.json ```json { "expo": { "name": "My App", "slug": "my-app", "version": "1.0.0", "orientation": "portrait", "icon": "./assets/icon.png", "userInterfaceStyle": "automatic", "splash": { "image": "./assets/splash.png", "resizeMode": "contain", "backgroundColor": "#ffffff" }, "assetBundlePatterns": ["**/*"], "ios": { "supportsTablet": true, "bundleIdentifier": "com.company.myapp" }, "android": { "adaptiveIcon": { "foregroundImage": "./assets/adaptive-icon.png", "backgroundColor": "#ffffff" }, "package": "com.company.myapp" }, "web": { "bundler": "metro", "output": "static", "favicon": "./assets/favicon.png" }, "plugins": [], "experiments": { "typedRoutes": true } } } ``` ### app.config.js (Dynamic Configuration) ```javascript export default ({ config }) => { return { ...config, name: process.env.APP_NAME || 'My App', version: process.env.APP_VERSION || '1.0.0', extra: { apiUrl: process.env.API_URL, enableAnalytics: process.env.ENABLE_ANALYTICS === 'true', }, }; }; ``` ## Environment Variables ### .env Files ```bash # .env EXPO_PUBLIC_API_URL=https://api.example.com EXPO_PUBLIC_ANALYTICS_KEY=abc123 ``` ### Using Environment Variables ```typescript // Must be prefixed with EXPO_PUBLIC_ const apiUrl = process.env.EXPO_PUBLIC_API_URL; // Or use expo-constants for extra config import Constants from 'expo-constants'; const { apiUrl } = Constants.expoConfig?.extra ?? {}; ``` ## Common Plugins ### Install Plugins ```bash # Expo Router npx expo install expo-router # Secure Store npx expo install expo-secure-store # Image Picker npx expo install expo-image-picker # Camera npx expo install expo-camera # Location npx expo install expo-location # Notifications npx expo install expo-notifications # Haptics npx expo install expo-haptics ``` ### Configure Plugins ```json { "expo": { "plugins": [ "expo-router", "expo-secure-store", [ "expo-image-picker", { "photosPermission": "Allow $(PRODUCT_NAME) to access your photos." } ], [ "expo-camera", { "cameraPermission": "Allow $(PRODUCT_NAME) to access camera." } ], [ "expo-location", { "locationAlwaysAndWhenInUsePermission": "Allow $(PRODUCT_NAME) to use your location." } ] ] } } ``` ## New Architecture ### Enable New Architecture ```json { "expo": { "newArchEnabled": true } } ``` ## EAS Configuration ### eas.json ```json { "cli": { "version": ">= 5.0.0" }, "build": { "development": { "developmentClient": true, "distribution": "internal" }, "preview": { "distribution": "internal" }, "production": {} }, "submit": { "production": {} } } ``` ### EAS Update Configuration ```json { "expo": { "updates": { "url": "https://u.expo.dev/your-project-id" }, "runtimeVersion": { "policy": "appVersion" } } } ``` ## Development Commands ```bash # Start development server npx expo start # Start with specific platform npx expo start --ios npx expo start --android # Clear cache npx expo start --clear # Prebuild native projects npx expo prebuild # Run native build npx expo run:ios npx expo run:android ``` ## TypeScript Configuration ### tsconfig.json ```json { "extends": "expo/tsconfig.base", "compilerOptions": { "strict": true, "noImplicitAny": true, "strictNullChecks": true, "noUncheckedIndexedAccess": true, "baseUrl": ".", "paths": { "@/*": ["./*"] } }, "include": ["**/*.ts", "**/*.tsx", ".expo/types/**/*.ts", "expo-env.d.ts"] } ``` ### expo-env.d.ts ```typescript /// // Add custom type declarations here declare module '*.png' { const value: number; export default value; } ``` ## Metro Configuration ### metro.config.js ```javascript const { getDefaultConfig } = require('expo/metro-config'); const config = getDefaultConfig(__dirname); // Add custom configuration config.resolver.sourceExts.push('cjs'); module.exports = config; ``` ## Splash Screen ### Configure Splash ```json { "expo": { "splash": { "image": "./assets/splash.png", "resizeMode": "cover", "backgroundColor": "#3B82F6" } } } ``` ### Programmatic Control ```typescript import * as SplashScreen from 'expo-splash-screen'; // Prevent auto-hide SplashScreen.preventAutoHideAsync(); // Hide when ready await SplashScreen.hideAsync(); ``` ## App Icons ### Configure Icons ```json { "expo": { "icon": "./assets/icon.png", "ios": { "icon": "./assets/ios-icon.png" }, "android": { "adaptiveIcon": { "foregroundImage": "./assets/adaptive-icon.png", "backgroundColor": "#ffffff" } } } } ``` ## Notes - Use `EXPO_PUBLIC_` prefix for client-side env vars - Enable typed routes for type-safe navigation - Configure EAS for production builds - Use app.config.js for dynamic configuration - Add plugins for native functionality --- Source attribution: IvanTorresEdge Original project: https://github.com/IvanTorresEdge/molcajete.ai/blob/be1e8b25920ff4fbc0088419693f5e928c7e7a4d/deprecated/tech-stacks/js/react-native/skills/expo-configuration/SKILL.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice Copyright 2025 Ivan Torres Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Mega AI Hub resource metadata Creator / publisher: IvanTorresEdge Original project: https://github.com/IvanTorresEdge/molcajete.ai/blob/be1e8b25920ff4fbc0088419693f5e928c7e7a4d/deprecated/tech-stacks/js/react-native/skills/expo-configuration/SKILL.md Attribution basis: Recovered original package and original project license at a pinned revision Fields of work: Development & Engineering, Product Management Roles: Frontend Developer, Mobile Developer, Product Manager Specialties: Frontend, Mobile Tools: Expo Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: e9514adc4405c79de35ef5aec768010d3222dde082e555c4334d27c1c2f01d24 Metadata reviewed: 2026-10-27 This metadata supersedes earlier Mega AI Hub catalog attribution. Original instruction and supporting files are preserved.