👉 "React Native New Architecture Migration: What Broke and How We Fixed It"

Recently, I migrated a production React Native application from the Legacy Architecture to the New Architecture (Fabric + TurboModules + JSI).

What looked like a simple configuration change:

newArchEnabled=true

turned into a journey of debugging navigation issues, Fabric rendering glitches, Reanimated crashes, and third-party library incompatibilities.

Key Lessons

✅ Audit every dependency before enabling New Architecture.

✅ Upgrade React Navigation, Reanimated, and Gesture Handler first.

✅ Avoid navigation calls during render; use useEffect.

✅ Test on real devices, not just simulators.

✅ Enable New Architecture gradually in staging before production.

Issues We Faced

Cannot apply update because surface was stopped

Surface already running

Fabric layout inconsistencies

Reanimated worklet crashes

Native module compatibility issues

What Improved?

Faster app startup

Smoother animations

Better list performance

Reduced JS ↔ Native communication overhead

Final Thought

The New Architecture is not just an upgrade—it's a platform migration. The effort is worth it, but plan carefully, audit dependencies, and migrate incrementally. React Native's future is built around Fabric, TurboModules, and JSI.