nautilytics/React Native New Architecture Migration.md

## React Native New Architecture Migration.md

      
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              React Native New Architecture Migration.md
            
          
    React Native New Architecture Migration - Executive Summary

Current Status ✅

Your app is already running on the New Architecture!

✅ React Native 0.76.9 (New Architecture enabled by default)
✅ Expo SDK 52.0.47 (Full New Architecture support)
✅ Hermes JS Engine enabled
✅ newArchEnabled: true configured in app.config.ts

What's Next?

While the New Architecture is enabled, you need to:

Update dependencies for optimal compatibility
Refactor code to leverage new features
Verify critical integrations work correctly
Test thoroughly before production rollout


Quick Action Items

🔴 CRITICAL - Do First


Verify Authentication - Test Okta integration thoroughly
Verify Payments - Test Plaid integration
Verify Feature Flags - Test LaunchDarkly
Run Tests - Ensure existing functionality works

🟡 HIGH PRIORITY - Week 1


Update @apollo/client to latest 3.11.x
Update react-native-reanimated to latest
Update react-native-screens to latest
Run full test suite

🟢 MEDIUM PRIORITY - Week 2-3


Update @react-navigation/* to v7
Update @sentry/react-native
Verify third-party SDK compatibility
Refactor onLayout to useLayoutEffect (4 files)


Key Benefits You'll Get

1. Synchronous Layout & Effects


No more visual jumps from onLayout
Smoother UI updates
Better user experience

2. React 18 Concurrent Features


useTransition for responsive UI
useDeferredValue for smooth inputs
Suspense for better loading states
Automatic batching (already working!)

3. Better Performance


Faster JavaScript/Native communication (JSI)
Improved rendering performance
Smoother animations
Lower memory usage


Files to Update

Code Refactoring (4 files)


src/@payments/screens/FundingAccountsScreen/FundingAccountsScreen.tsx
src/@payments/screens/PaymentsFlow/PaymentSlider/PaymentSliderScreen.tsx
src/@payments/screens/PaymentsFlow/PaymentSlider/SliderSection.tsx
src/@core/navigation/screens/LockCardScreen/LockCardScreen.tsx

Configuration


✅ app.config.ts - Already updated with newArchEnabled: true
package.json - Will be updated with new dependency versions


Risk Assessment

Low Risk ✅


Apollo Client update
Reanimated update
Screens update
Most Expo packages

Medium Risk ⚠️


React Navigation v7 upgrade
Sentry update
Code refactoring

High Risk 🔴


Okta SDK (has patch, needs verification)
Plaid SDK (payment critical)
LaunchDarkly (feature flags critical)


Testing Strategy

Phase 1: Smoke Tests

npm test
npm run typecheck
npm run lint
Phase 2: E2E Tests

npm run maestro:ios:all
npm run maestro:android:all
Phase 3: Manual Testing


Authentication flows
Payment flows
Navigation
Animations
Push notifications
Feature flags


Timeline

Week 1: Foundation


Update low-risk dependencies
Run automated tests
Verify core functionality

Week 2: Navigation & Services


Update React Navigation
Verify critical SDKs
Begin code refactoring

Week 3: Monitoring & Analytics


Update Sentry
Verify analytics SDKs
Complete code refactoring

Week 4: Polish & Deploy


Final testing
Performance validation
Documentation
Gradual rollout


Success Metrics

Track these before and after:

 App startup time
 Navigation performance
 Animation frame rate (target: 60 FPS)
 Memory usage
 Crash rate
 User-reported issues


Rollback Plan

If issues occur:
# Quick rollback
git checkout package.json package-lock.json
npm install
npx expo prebuild --clean

# Emergency disable New Architecture
# Set newArchEnabled: false in app.config.ts
npx expo prebuild --clean

Resources


📄 Detailed Dependency Plan
🔗 React Native New Architecture Docs
🔗 Expo New Architecture Guide


Next Steps


Review the detailed dependency plan
Discuss with team about timeline
Create a feature branch for updates
Start with Phase 1 low-risk updates
Test thoroughly after each phase
Monitor metrics closely


Status: Ready to begin implementation

Last Updated: 2025-10-01

Owner: Technical Product Owner
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