React Native / Expo Patterns

Practical patterns for building production React Native apps with Expo. Covers navigation, state, data fetching, lists, styling, and native APIs. Pairs with the rules/react-native/ ruleset: rules say what to enforce, this skill shows how.

Libraries named below (NativeWind, Zustand/Jotai, TanStack Query) are common, well-established options shown for illustration — the patterns matter more than the specific package, and any equivalent works. Zod is used for validation to stay consistent with ECC's existing typescript/ rules.

These patterns assume the managed Expo workflow (Expo Router, EAS, expo-* modules) on the New Architecture (the default in recent Expo SDKs, mandatory from SDK 55+). They do NOT assume the browser DOM — React Native has no <div>, no URL bar, and no web data-fetching defaults.

When to Activate

Use this skill when: