Deep Linking & App Links Patterns

Quick Guide: Universal Links (iOS) and App Links (Android) are the gold standard -- they use HTTPS URLs that open your app directly or fall back to the website. Custom URI schemes (myapp://) are simpler but less reliable (no fallback, can be hijacked). Use expo-linking for URL handling (useURL, createURL, parse). Expo Router handles deep linking automatically. React Navigation requires a linking config. Always test on real devices -- simulators miss edge cases.

<critical_requirements>

CRITICAL: Before Using This Skill

All code must follow project conventions in CLAUDE.md (kebab-case, named exports, import ordering, import type, named constants)

(You MUST use Universal Links (iOS) and App Links (Android) for production apps -- custom URI schemes have no fallback and can be hijacked by other apps)

(You MUST host AASA and assetlinks.json over HTTPS at /.well-known/ -- Apple and Google will reject HTTP or incorrectly hosted files)

(You MUST handle all three app states: cold start (app not running), background (app suspended), and foreground (app active) -- missing any state causes dropped links)

(You MUST test deep links on real devices -- simulators and emulators do not fully replicate OS-level link handling behavior)