expo

Expo framework for universal React Native apps — routing, SDK modules, EAS builds, OTA updates, and config plugins

Repository: InugamiDev/ultrathink-oss
Last source activity: April 6, 2026 at 05:30
Detected SKILL.md language: English
Stars: 43
Forks: 10

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Expo

Framework and platform for building universal React Native applications targeting iOS, Android, and web from a single codebase with managed native tooling.

When to Use

Building a new mobile or universal app with React Native

Need file-based routing (Expo Router)

Want managed native builds without Xcode/Android Studio (EAS Build)

Need OTA updates without app store resubmission

Integrating native device APIs (Camera, FileSystem, Notifications, etc.)

Creating custom native modules with the Expo Modules API

Key Patterns

Expo Router: File-based routing in app/ directory — layouts, groups, dynamic routes, typed routes

Expo SDK Modules: Curated native APIs — Camera, FileSystem, Notifications, SecureStore, Haptics, Location

EAS Build: Cloud-native iOS/Android builds; eas build --platform all

EAS Submit: Automated App Store and Google Play submission; eas submit

Config Plugins: Modify native projects declaratively via app.config.ts plugins array

Development Builds vs Expo Go: Dev builds include custom native code; Expo Go for SDK-only prototyping

EAS Update: OTA JS/asset updates without store review; branch-based deployment channels

Expo Modules API: Write custom native modules in Swift/Kotlin with typed bridge

app.config.ts: Dynamic configuration with environment variables, build profiles, and plugin composition

Universal Apps: Single codebase for iOS, Android, and web with platform-specific overrides via .ios.tsx/.android.tsx/.web.tsx

Anti-Patterns

Anti-Pattern

Why

Instead

Ejecting prematurely

Loses managed workflow benefits

Use config plugins or dev builds first

Using Expo Go for production testing

Missing custom native modules

Use development builds (npx expo run:ios)

Hardcoding env values in app.json

Leaks secrets, no per-environment config

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