Mobile Native Standards Enforcer

This skill ensures all code adheres to the mobile native template's core principles. Apply these checks proactively when creating or modifying components, screens, or any UI code.

Before Making Changes

Run this validation checklist mentally or explicitly:

code

Standards Validation:
- [ ] No hardcoded colors (hex codes or Tailwind color classes)
- [ ] Using theme system via useTheme() hook
- [ ] Safe areas handled with useSafeAreaInsets() or layout components
- [ ] Platform-specific code uses correct patterns
- [ ] TypeScript strict mode compliant (no 'any' types)
- [ ] Animations use Reanimated 4
- [ ] Component is production-grade (if creating new component)

Core Principle Enforcement

1. Zero Hardcoded Colors

Rule: Every color must come from the theme system.

Check for violations:

•Hex codes: #000000, #FFFFFF, #FF5733, etc.
•RGB/RGBA values: rgb(0,0,0), rgba(255,255,255,0.5)
•Tailwind color classes: bg-black, text-blue-500, border-red-600
•Named colors: backgroundColor: 'red', color: 'white'

Correct pattern:

typescript

import { useTheme } from '@/hooks';

const { colors } = useTheme();

// For View/TouchableOpacity/Pressable
<View style={{ backgroundColor: colors.background.primary }} />

// For Text
<Text style={{ color: colors.text.primary }} />

// For borders
<View style={{ borderColor: colors.border.default }} />

Available theme colors (check constants/colors.ts for complete list):

•colors.background.* - primary, secondary, tertiary, elevated
•colors.text.* - primary, secondary, tertiary, inverse
•colors.border.* - default, subtle, emphasis
•colors.surface.* - primary, secondary, overlay
•colors.accent.* - primary, secondary, success, warning, error, info

If you see a violation: Stop and refactor to use theme colors before proceeding.

2. Safe Area Handling

Rule: Never use deprecated SafeAreaView from react-native.

Check for violations:

typescript

// ❌ WRONG - deprecated
import { SafeAreaView } from 'react-native';

Correct patterns:

Option A: Use the hook (preferred for animations)

typescript

import { useSafeAreaInsets } from 'react-native-safe-area-context';

const insets = useSafeAreaInsets();

<View style={{ paddingTop: insets.top, paddingBottom: insets.bottom }}>
  {/* content */}
</View>

Option B: Use layout components

typescript

import { ScreenLayout } from '@/components/layouts';

<ScreenLayout>
  {/* content - safe areas handled automatically */}
</ScreenLayout>

3. Platform-Specific Code

Rule: Use correct patterns for platform differences.

For full component differences, use file extensions:

code

Component.ios.tsx      // iOS 26 Liquid Glass implementation
Component.android.tsx  // Android 16 Material 3 implementation  
Component.web.tsx      // Web fallback
Component.tsx          // Base/shared logic or type exports

For minor differences, use Platform module:

typescript

import { Platform } from 'react-native';

const hitSlop = Platform.select({
  ios: { top: 10, bottom: 10, left: 10, right: 10 },
  android: 20,
  default: 10
});

// Or conditional logic
if (Platform.OS === 'ios') {
  // iOS-specific code
} else if (Platform.OS === 'android') {
  // Android-specific code
}

4. Animation Standards

Rule: All animations must use Reanimated 4.

Check for violations:

•Using Animated from react-native (deprecated)
•Using LayoutAnimation (unreliable)
•CSS transitions on web that don't work on native

Correct pattern:

typescript

import Animated, { 
  FadeIn, 
  FadeOut, 
  SlideInRight,
  useAnimatedStyle,
  withTiming 
} from 'react-native-reanimated';

// Entering/exiting animations
<Animated.View entering={FadeIn} exiting={FadeOut}>
  {/* content */}
</Animated.View>

// Custom animations
const animatedStyle = useAnimatedStyle(() => ({
  opacity: withTiming(isVisible ? 1 : 0)
}));

5. TypeScript Strict Mode

Rule: No any types. Use proper generics and type inference.

Check for violations:

typescript

// ❌ WRONG
const data: any = fetchData();
function process(item: any) { }

Correct patterns:

typescript

// ✅ Use proper types
interface User {
  id: string;
  name: string;
}

const data: User[] = fetchData();

// ✅ Use generics
function process<T>(item: T): T {
  return item;
}

// ✅ Use unknown for truly unknown types, then narrow
const data: unknown = fetchData();
if (typeof data === 'object' && data !== null) {
  // Now you can safely access properties
}

Production-Grade Component Standards

When creating a new component in components/ui/, it must meet ALL criteria:

Component Checklist

code

Production Component Requirements:
- [ ] Fully typed with TypeScript strict mode
- [ ] Props interface exported and documented with JSDoc
- [ ] Supports light/dark mode via useTheme()
- [ ] Has variants (size, color, state) as needed
- [ ] Works on iOS, Android, and web
- [ ] Uses Reanimated 4 for animations
- [ ] Handles accessibility (accessibilityLabel, accessibilityRole)
- [ ] No hardcoded colors or spacing
- [ ] Uses centralized spacing from constants/spacing.ts
- [ ] Exported from components/ui/index.ts

Component Template

Use this structure for new components:

typescript

import React from 'react';
import { View, Text, Pressable } from 'react-native';
import { useTheme } from '@/hooks';
import { spacing } from '@/constants';

/**
 * [Component description]
 * 
 * @example
 * ```tsx
 * <YourComponent variant="primary" size="medium">
 *   Content
 * </YourComponent>
 * ```
 */

interface YourComponentProps {
  /** Component children */
  children?: React.ReactNode;
  /** Visual variant */
  variant?: 'primary' | 'secondary' | 'tertiary';
  /** Size variant */
  size?: 'small' | 'medium' | 'large';
  /** Optional callback */
  onPress?: () => void;
}

export function YourComponent({
  children,
  variant = 'primary',
  size = 'medium',
  onPress,
}: YourComponentProps) {
  const { colors } = useTheme();
  
  // Calculate styles based on props
  const backgroundColor = variant === 'primary' 
    ? colors.accent.primary 
    : colors.background.secondary;
    
  const paddingSize = size === 'small' 
    ? spacing.sm 
    : size === 'large' 
    ? spacing.lg 
    : spacing.md;
  
  return (
    <Pressable
      onPress={onPress}
      style={{
        backgroundColor,
        padding: paddingSize,
        borderRadius: spacing.xs,
      }}
      accessibilityRole="button"
    >
      <Text style={{ color: colors.text.primary }}>
        {children}
      </Text>
    </Pressable>
  );
}

Common Violations and Fixes

Violation: Hardcoded Black Background

typescript

// ❌ WRONG
<View style={{ backgroundColor: '#000000' }} />
<View className="bg-black" />

// ✅ CORRECT
const { colors } = useTheme();
<View style={{ backgroundColor: colors.background.primary }} />

Violation: Using SafeAreaView from React Native

typescript

// ❌ WRONG
import { SafeAreaView } from 'react-native';

<SafeAreaView>
  <View>Content</View>
</SafeAreaView>

// ✅ CORRECT
import { useSafeAreaInsets } from 'react-native-safe-area-context';

const insets = useSafeAreaInsets();

<View style={{ paddingTop: insets.top }}>
  <View>Content</View>
</View>

Violation: Any Type Usage

typescript

// ❌ WRONG
function handleData(data: any) {
  console.log(data.name);
}

// ✅ CORRECT
interface Data {
  name: string;
}

function handleData(data: Data) {
  console.log(data.name);
}

Violation: Magic Numbers for Spacing

typescript

// ❌ WRONG
<View style={{ padding: 16, margin: 8 }} />

// ✅ CORRECT
import { spacing } from '@/constants';

<View style={{ padding: spacing.md, margin: spacing.sm }} />

Violation: Using Animated from react-native

typescript

// ❌ WRONG
import { Animated } from 'react-native';

const fadeAnim = new Animated.Value(0);

// ✅ CORRECT
import Animated, { FadeIn } from 'react-native-reanimated';

<Animated.View entering={FadeIn}>
  {/* content */}
</Animated.View>

Enforcement Workflow

When creating or modifying code:

•Before writing: Review relevant standards above
•While writing: Use theme system, proper imports, and types
•After writing: Run the validation checklist
•If violations found: Fix immediately before proceeding

Quick Reference

Colors: const { colors } = useTheme();
Safe Areas: const insets = useSafeAreaInsets();
Spacing: import { spacing } from '@/constants';
Platform: import { Platform } from 'react-native';
Animation: import Animated, { FadeIn } from 'react-native-reanimated';

Philosophy Reminder

This template prioritizes:

•Native first: iOS 26 Liquid Glass + Android 16 Material 3 Expressive
•No shortcuts: Three platform implementations if needed
•Design system discipline: Single source of truth for all styles

Enforce these principles in every change.