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rn-styling

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更新日2026年5月29日 19:58

Use when styling React Native + Expo components: choosing between StyleSheet/NativeWind/inline, wiring NativeWind v4 from DESIGN.md tokens, handling Flexbox in RN (column-by-default, not row), safe-area insets, dark mode, responsive design with useWindowDimensions, optimized images via expo-image, performant lists via FlashList. Triggers on: "style this screen", "add dark mode", "fix safe area", "import design tokens", "set up NativeWind", or when an agent is about to write StyleSheet/className in an RN file. Not for: building screens end-to-end (rn-add-screen, Wave 2), navigation (rn-expo-router), animations (rn-animations-gestures, Wave 3), or web styling (Next.js stack).

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lukedj78

lukedj78/dev-flow

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rn-styling — guardrail for styling in React Native + Expo

The 5 rules (non-negotiable)

NativeWind v4 is the default. StyleSheet only for performance-critical paths (per-frame animations etc.).
No magic numbers. Every spacing/color/radius/font value comes from tailwind.config.js (which mirrors the project's DESIGN.md tokens).
SafeArea mandatory on every root screen. Use SafeAreaView from react-native-safe-area-context (NOT the one from react-native).
Dark mode via useColorScheme + Tailwind dark: variant. Never Appearance.getColorScheme() at module top-level.
Optimized primitives: expo-image instead of Image; @shopify/flash-list for any list > 20 items.

Quick decision tree

"Should I style this with NativeWind or StyleSheet?" → references/decision-tree.md
"How do I set up NativeWind v4 from scratch?" → references/nativewind-setup.md
"Why does Flexbox behave differently than on the web?" → references/concepts.md
"What are the common patterns and anti-patterns?" → references/patterns.md
"Show me a real example" → references/examples/

Common anti-patterns (NEVER do)

❌ style={{ padding: 16 }} with a magic number — pull from token.
❌ Root <View> without SafeAreaView from react-native-safe-area-context.
❌ import "tailwindcss" directly in code — only NativeWind imports.
❌ Appearance.getColorScheme() at module level — use useColorScheme() hook.
❌ Image from react-native for remote URIs — use expo-image.
❌ flex: 1 on root + scroll without contentContainerStyle on ScrollView — content gets clipped.

Sources

Course: codewithbeto.dev/rnCourse — lesson 10 "Styling Your App" (free).
Official: https://docs.expo.dev/develop/user-interface/styling/
Official: https://www.nativewind.dev/ (v4)
Official: https://github.com/AppAndFlow/react-native-safe-area-context

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Generate a real, working page (route + components) inside an already-scaffolded app from a single UI screenshot, applying the project's DESIGN.md tokens and the existing UI library (shadcn or MUI). Reads a screenshot from `.workflow/screenshots/`, plus `.workflow/DESIGN.md` and `.workflow/meta.json` for tokens and stack, then writes the route into the codebase at the project root. Use when the user says "fai questa pagina dallo screenshot", "build the home page from this image", "/journal route from this PNG", "convert this mockup to code", or the orchestrator routes here from phase `scaffolded` with unmapped screenshots present. Not for: scaffolding the app from scratch (use `design-md-to-app`), extracting tokens from Figma (use `figma-to-design-md`), or wiring backend modules (use `module-add`).

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name

rn-styling

description

rn-styling — guardrail for styling in React Native + Expo

The 5 rules (non-negotiable)

NativeWind v4 is the default. StyleSheet only for performance-critical paths (per-frame animations etc.).
No magic numbers. Every spacing/color/radius/font value comes from tailwind.config.js (which mirrors the project's DESIGN.md tokens).
SafeArea mandatory on every root screen. Use SafeAreaView from react-native-safe-area-context (NOT the one from react-native).
Dark mode via useColorScheme + Tailwind dark: variant. Never Appearance.getColorScheme() at module top-level.
Optimized primitives: expo-image instead of Image; @shopify/flash-list for any list > 20 items.

Quick decision tree

"Should I style this with NativeWind or StyleSheet?" → references/decision-tree.md
"How do I set up NativeWind v4 from scratch?" → references/nativewind-setup.md
"Why does Flexbox behave differently than on the web?" → references/concepts.md
"What are the common patterns and anti-patterns?" → references/patterns.md
"Show me a real example" → references/examples/

Common anti-patterns (NEVER do)

❌ style={{ padding: 16 }} with a magic number — pull from token.
❌ Root <View> without SafeAreaView from react-native-safe-area-context.
❌ import "tailwindcss" directly in code — only NativeWind imports.
❌ Appearance.getColorScheme() at module level — use useColorScheme() hook.
❌ Image from react-native for remote URIs — use expo-image.
❌ flex: 1 on root + scroll without contentContainerStyle on ScrollView — content gets clipped.

Sources

Course: codewithbeto.dev/rnCourse — lesson 10 "Styling Your App" (free).
Official: https://docs.expo.dev/develop/user-interface/styling/
Official: https://www.nativewind.dev/ (v4)
Official: https://github.com/AppAndFlow/react-native-safe-area-context