Expo react native coder

Expo React Native Coder Best Practices

Comprehensive feature development guide for Expo React Native applications. Contains 50 rules across 10 categories, covering everything from project setup to testing. Includes production-ready code templates for common features.

When to Apply

Reference these guidelines when:

• Setting up a new Expo project with TypeScript
• Building navigation with Expo Router (tabs, stacks, drawers, modals)
• Creating screens (list, detail, form, settings)
• Implementing authentication flows with protected routes
• Configuring deep linking and universal links

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Project Setup & Configuration	CRITICAL	setup-
2	Routing & Navigation	CRITICAL	route-
3	Screen Patterns & Layouts	HIGH	screen-
4	Data Fetching & State	HIGH	data-
5	Authentication & Security	HIGH	auth-
6	Deep Linking & Universal Links	HIGH	link-
7	Native UX Patterns	MEDIUM-HIGH	ux-
8	Forms & User Input	MEDIUM	form-
9	Assets & Theming	MEDIUM	asset-
10	Error Handling & Testing	MEDIUM	test-

Quick Reference

1. Project Setup & Configuration (CRITICAL)

• setup-typescript-config - Configure TypeScript with strict mode
• setup-app-config-typescript - Use typed app.config.ts
• setup-environment-variables - EXPO_PUBLIC_ prefix for client vars
• setup-eas-build-profiles - EAS build profiles per environment
• setup-development-build - Development builds vs Expo Go

2. Routing & Navigation (CRITICAL)

• route-file-based-routing - File-based routing with Expo Router
• route-tab-navigator - Tab navigator with route groups
• route-dynamic-segments - Dynamic route segments [param]
• route-stack-within-tabs - Nested stack in tabs
• route-modal-presentation - Modal screen presentation
• route-typed-routes - Enable typed routes
• route-drawer-navigator - Drawer navigator setup

3. Screen Patterns & Layouts (HIGH)

• screen-list-flashlist - FlashList for large lists
• screen-detail-params - Pass minimal data via params
• screen-loading-state - Loading and error states
• screen-pull-to-refresh - Pull-to-refresh pattern
• screen-header-options - Configure screen headers
• screen-settings-list - Settings screen with SectionList

4. Data Fetching & State (HIGH)

• data-api-routes - Server-side API routes
• data-secure-store - SecureStore for sensitive data
• data-sqlite-local - SQLite for complex local data
• data-fetch-on-focus - Refetch on screen focus
• data-async-storage-simple - AsyncStorage for preferences
• data-abort-controller - Cancel fetch on unmount

5. Authentication & Security (HIGH)

• auth-protected-routes - Stack.Protected guards
• auth-context-provider - Auth context with session
• auth-oauth-flow - OAuth with AuthSession
• auth-login-form - Login form with validation
• auth-splash-loading - Splash screen during auth check

6. Deep Linking & Universal Links (HIGH)

• link-deep-linking-scheme - Custom URL scheme
• link-universal-links-ios - iOS Universal Links
• link-android-app-links - Android App Links
• link-handle-incoming - Handle incoming URLs

7. Native UX Patterns (MEDIUM-HIGH)

• ux-safe-area-insets - SafeAreaView for notches
• ux-status-bar - Status bar styling
• ux-haptic-feedback - Haptic feedback on actions
• ux-gesture-handler - Gesture handler for swipes
• ux-keyboard-avoiding - KeyboardAvoidingView

8. Forms & User Input (MEDIUM)

• form-text-input-config - TextInput keyboard types
• form-controlled-inputs - Controlled inputs with useState
• form-submit-button-state - Disable button during submit
• form-dismiss-keyboard - Dismiss keyboard on tap outside

9. Assets & Theming (MEDIUM)

• asset-image-optimization - expo-image for caching
• asset-font-loading - Load fonts with useFonts
• asset-vector-icons - @expo/vector-icons
• asset-splash-screen - Splash screen configuration

10. Error Handling & Testing (MEDIUM)

• test-jest-setup - Jest with jest-expo preset
• test-component-testing - Testing Library for components
• test-error-boundary - Error boundaries
• test-e2e-maestro - Maestro E2E testing

Code Templates

Production-ready templates are available in assets/templates/:

Template	Description
layouts/tab-layout.tsx	Bottom tab navigator with icons
layouts/auth-layout.tsx	Root layout with protected routes
screens/list-screen.tsx	List with FlashList, refresh, states
screens/detail-screen.tsx	Detail screen with param handling
screens/form-screen.tsx	Form with validation, keyboard handling
hooks/use-auth.tsx	Auth context with SecureStore
components/error-boundary.tsx	Error boundary component

How to Use

Read individual reference files for detailed explanations and code examples:

• Section definitions - Category structure and impact levels
• Rule template - Template for adding new rules

Full Compiled Document

For a single comprehensive document with all rules, see AGENTS.md.

Reference Files

File	Description
AGENTS.md	Complete compiled guide with all rules
references/_sections.md	Category definitions and ordering
assets/templates/	Production-ready code templates
metadata.json	Version and reference information