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Every mobile app starts from a working Expo project. Metro is already running, the web preview iframe is live, and Expo Go can scan the QR the moment your project page loads. This page is the inventory of what’s preinstalled, so you know what you can take for granted.

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The stack

LayerChoice
FrameworkExpo SDK 54 + React 19 + React Native 0.81
RoutingExpo Router 6 (file-based; app/_layout.tsx is the root)
StylingNativeWind 4 (Tailwind v3 syntax for RN) + clsx + tailwind-merge
Iconslucide-react-native
Storage@react-native-async-storage/async-storage
Animationreact-native-reanimated + react-native-gesture-handler
Hapticsexpo-haptics
Web previewreact-native-web so the dashboard’s Android DeviceFrame iframe works
Everything in this table ships preinstalled. Other common picks (TanStack Query, Zustand, React Hook Form + Zod, Supabase, expo-secure-store, image picker, push, camera, charts) are not preinstalled — the agent adds them on demand via add_dependency, which under the hood runs npx expo install so versions stay pinned to SDK 54.

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What lands automatically

  • File-based routes under app/ (Expo Router) with a starter (tabs) layout
  • app/_layout.tsx with the lib/mana-preview-bridge side-effect import that lets the dashboard’s Android DeviceFrame back button drive the iframe — do not delete this import
  • NativeWind set up so Tailwind utility classes work on every RN component
  • Reanimated + Gesture Handler preinitialised so animations and gestures work without extra setup
  • TypeScript, lib/* helpers at the project root (no src/ directory)

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What gets added on demand

The agent adds anything else you need (resolved via add_dependency, which routes to npx expo install for SDK-pinned versions):
  • Backend — @supabase/supabase-js whenever the prompt mentions auth, database, or storage
  • State / data — @tanstack/react-query, zustand
  • Forms — react-hook-form + zod + @hookform/resolvers
  • Secure storage — expo-secure-store for tokens; react-native-mmkv for hot read paths
  • Native modules — expo-camera, expo-image-picker, expo-location, expo-notifications, expo-local-authentication
  • Visual extras — expo-blur, expo-linear-gradient, lottie-react-native
  • Maps — react-native-maps
Ask for a feature; the dependencies follow.

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Why pre-installed matters

Three things you get for free:
  1. Metro is up before you finish typing your prompt. No npm install between you and a preview.
  2. Expo Go scans into a running app. The QR code is live the moment the project loads — not after a minute of build setup.
  3. Smaller, faster prompts. The agent doesn’t waste turns regenerating React Native boilerplate (entry point, navigators, providers). It writes only what varies.