👉 "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.