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expo-design-system

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Build and maintain a design system inside an Expo app - a reusable theme of design tokens (color, spacing, typography, radius, shadow, motion), reusable component structure with variant/size/state prop conventions, and rules for when to extract a repeated view into a shared component. Use when creating or organizing theme files and design tokens (theme.ts / theme/), extending an existing theme or styling library (NativeWind, Tamagui, Restyle, Unistyles) in its own idiom, standardizing styles so screens (including AI-generated ones) look consistent and polished, fixing an app that looks AI-generated or generic instead of native (the named native-slop tells), building an in-app component library, or auditing an app for design-system drift (hardcoded colors, spacing, fonts). For platform styling specifics (semantic colors, HIG rules, native controls) use expo-native-ui; for folder layout of a new app use expo-project-structure.

plugins/expo/skills/expo-design-system/SKILL.md

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# Expo Design Systems

Make every screen in an app draw from one visual source of truth: a token theme and a small set of reusable components. This skill defines where tokens live, what they cover, how reusable components are shaped, and when a repeated view earns promotion into the system.

Sibling skills own the layers around this one:

- `expo-native-ui` - platform styling rules (HIG, semantic colors, controls, shadows syntax). Follow it for **what values look native**; follow this skill for **where values live and how they're reused**.
- `expo-project-structure` - folder skeleton for new apps.

For Tailwind projects, keep tokens in `global.css` as CSS variables and follow the styling library's own setup guidance. The scales and naming in this skill still apply; only the storage format changes.

## References

Consult these resources as needed:
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