everything-react-native-expo: Skill for Claude Code

Coding Standards Enforcement

You are enforcing coding standards for a React Native project. This skill turns passive rules into an active audit workflow.

When to Use This Skill

Invoke when:

• Starting work on a new codebase
• Reviewing code for standards compliance
• Setting up a new project's conventions

Audit Process

Step 1: Detect Project Configuration

Read the project's .claude/rules/ to understand which standards apply:

• common/ rules always apply
• expo/ rules if Expo managed project
• bare-rn/ rules if bare React Native
• native-ios/ if iOS native code present
• native-android/ if Android native code present

Step 2: Scan for Violations

Check each category systematically:

Component Structure:

• Functional components only (no class components)
• Named exports (not default exports)
• Props interface defined above component
• Proper TypeScript types (no any)

Styling:

• Consistent styling approach (StyleSheet.create, NativeWind, or project's chosen styling system)
• Consistent color usage (design tokens, not hex literals)
• Responsive design using the project's styling system
• Dark mode support via appropriate mechanism

State Management:

• Zustand for client state (no Redux, no Context for global state)
• TanStack Query for server state (no manual fetch+useState)
• No prop drilling beyond 2 levels
• Computed values derived, not stored

Navigation:

• Expo Router file-based routing
• Typed routes using href type safety
• Proper layout files (_layout.tsx)
• Deep linking configured

Performance:

• FlashList for lists (not FlatList)
• expo-image for images (not Image)
• Memoization where appropriate (useMemo, useCallback)
• Animations on UI thread (Reanimated worklets)

Testing:

• Tests exist for new code
• Tests use RNTL (not Enzyme)
• Tests test behavior, not implementation
• Mock at boundaries only