Expo Brownfield

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Integrate Expo and React Native into an existing native iOS or Android app. Use for brownfield, embedding a React Native screen in SwiftUI/UIKit or Kotlin, or AAR/XCFramework packaging. Covers isolated and integrated approaches. For building or distributing a purely native app with EAS, use eas-app-stores.

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SKILL.md

expo-brownfield

Expo Brownfield

A brownfield app is an existing native iOS or Android app that adopts React Native incrementally, as opposed to a greenfield app that is React Native from day one.

Inspect the host first

Identify the existing app entry point, navigation owner, native build system, deployment targets, and any React Native runtime already linked. Record the installed Expo, React Native, and brownfield package versions from the lockfile. Adding EAS Build or Submit to a Swift app alone does not require React Native; route that task to .

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Version history

Approach	What ships to the native app	When to choose
Isolated	Prebuilt AAR / XCFramework	Native team doesn't need Node or RN tooling; RN code can live in a separate repo
Integrated	React Native sources added to the existing Gradle / CocoaPods build	One team owns everything; comfortable with RN tooling; wants a single build

Expo Brownfield

Expo Brownfield

Inspect the host first

Pick an approach

References

Shared prerequisites

Select compatible versions

Verify the feature in the host

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