react-native-brownfield-migration
Implements an accepted incremental brownfield migration from native iOS or Android to React Native or Expo using @callstack/react-native-brownfield. Use after the brownfield path has been selected, when setting up the integration, packaging XCFramework or AAR artifacts, or adding React Native surfaces to native hosts.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/ilteoood/harness --skill react-native-brownfield-migration- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads react-native-brownfield-migration automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Migrating to React Native
Use this skill only after the decision to adopt brownfield migration has been made. When the user is still choosing between brownfield, greenfield, a checkpoint-based path, defer, or no migration, use assess-react-native-migration first.
Overview
Prescriptive workflow for incremental adoption of React Native in existing native apps using @callstack/react-native-brownfield, from initial setup through phased host integration.
- Expo track
- Bare React Native track
Use one track per task unless the user explicitly asks for migration or comparison.
Migration Strategy
Use this strategy for brownfield migration planning and execution:
- Assess app state and select Expo or bare path.
- Perform initial setup with
@callstack/react-native-brownfield. - Package RN artifacts (
XCFramework/AAR) from the RN source app. - Integrate one RN surface into the host app and validate startup/runtime.
- Repeat integration by feature/screen for incremental rollout.
Agent Guardrails (Global)
Apply these rules across all reference files:
- Select one path first (Expo or bare) and do not mix steps.
- Use placeholders from the docs (
<framework_target_name>,<android_module_name>,<registered_module_name>) and resolve from project files. - Validate each packaging command before moving to host integration.
- Run
npx brownfield <command> --helpbefore relying on any flag table in these references; help output wins. - Write stable project settings once into
brownfield.config.*instead of repeating flags — see cli-and-config.md. - Prefer official docs for long platform snippets and CLI option details.
- Keep host apps isolated from direct React Native APIs when possible (facade approach).
- For startup/runtime verification, use
agent-deviceto open the host app, navigate to the RN surface, capture snapshots/screenshots, and collect device evidence. If it is missing and verification needs it, install it through the environment's approved/trusted path or ask the user to install or enable it.
Canonical Docs
- Quick Start
- Expo Integration
- iOS Integration
- Android Integration
- Brownfield CLI
- Configuration
- Guidelines
- Troubleshooting
Path Selection Gate (Must Run First)
Before selecting any reference file, classify the project:
- If no React Native app exists yet, use Expo creation path:
- expo-create-app.md -> expo-quick-start.md
- If React Native app exists, inspect
package.jsonandapp.json:- Expo if
expois present or Expo plugin workflow is requested. - Bare RN if native folders and direct RN CLI workflow are used without Expo path requirements.
- Expo if
- If still unclear, ask one disambiguation question.
- Continue with exactly one path.
When to Apply
Reference this package when:
- Implementing an accepted incremental migration from native-only apps to React Native or Expo
- Creating brownfield integration flows for Expo or bare React Native projects
- Performing initial setup with
@callstack/react-native-brownfield - Generating iOS XCFramework artifacts from a React Native app
- Generating and publishing Android AAR artifacts from a React Native app
- Integrating generated artifacts into host iOS/Android apps
Quick Reference
| File | Description |
|---|---|
| quick-start.md | Shared preflight and mandatory path-selection gate |
| cli-and-config.md | CLI commands, full flag sets, config file, artifact layout, codegen side effects |
| runtime-api.md | Host <-> RN API surface (JS, Swift, Kotlin) and reference apps |
| expo-create-app.md | Scaffold a new Expo app before Expo brownfield setup |
| expo-quick-start.md | Expo plugin setup and packaging readiness |
| expo-ios-integration.md | Expo iOS packaging and host startup integration |
| expo-android-integration.md | Expo Android packaging, publish, and host integration |
| bare-quick-start.md | Bare React Native baseline setup |
| bare-ios-xcframework-generation.md | Bare iOS XCFramework generation |
| bare-android-aar-generation.md | Bare Android AAR generation and publish |
| bare-ios-native-integration.md | Bare iOS host integration |
| bare-android-native-integration.md | Bare Android host integration |
Problem -> Skill Mapping
| Problem | Start With |
|---|---|
| Need migration path decision first | assess-react-native-migration |
| Need Expo vs bare path decision | quick-start.md |
| Need a CLI flag, the config file shape, or the artifact paths | cli-and-config.md |
| Need a host <-> RN API name, signature, or a working example app | runtime-api.md |
| Need shared state between host and RN, or typed RN -> native navigation | brownie / brownfield-navigation skills |
| Need to create a new Expo app for brownfield | expo-create-app.md |
| Need Expo brownfield setup and plugin wiring | expo-quick-start.md |
| Need Expo iOS brownfield integration | expo-ios-integration.md |
| Need Expo Android brownfield integration | expo-android-integration.md |
| Need bare RN baseline setup | bare-quick-start.md |
| Need bare RN iOS XCFramework generation | bare-ios-xcframework-generation.md |
| Need bare RN Android AAR generation/publish | bare-android-aar-generation.md |
| Need bare RN iOS host integration | bare-ios-native-integration.md |
| Need bare RN Android host integration | bare-android-native-integration.md |
Related Skills
- Assess React Native migration before selecting the migration path.
brownie(shared host <-> RN state) andbrownfield-navigation(typed RN -> native navigation) ship from another repo: invoke them by name, and fall back to the canonical docs if they are not installed.
FAQ
What does the react-native-brownfield-migration skill do?
Implements an accepted incremental brownfield migration from native iOS or Android to React Native or Expo using @callstack/react-native-brownfield. Use after the brownfield path has been selected, when setting up the integration, packaging XCFramework or AAR artifacts, or adding React Native surfaces to native hosts.
How do I install react-native-brownfield-migration?
Run npx skills add https://github.com/ilteoood/harness --skill react-native-brownfield-migration in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/react-native-brownfield-migration/ (personal) or .claude/skills/react-native-brownfield-migration/ (project).
Which AI agents can use react-native-brownfield-migration?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is react-native-brownfield-migration safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains react-native-brownfield-migration?
It is published by ilteoood in ilteoood/harness. It has 392 recorded installs.
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