Synchronizing Animated Values and Shared Values in React Native

Working with both React Native Animated and Reanimated in the same codebase? You're not alone. Callstack tackles the synchronization challenge that's been tripping up teams during gradual migrations.

React Native teams migrating from the legacy Animated API to Reanimated often need both libraries running side by side. This creates a tricky problem: how do you keep animated values in sync across two different animation systems without performance hits or janky UI?

Key Takeaways

• Bridge Animated.Value and SharedValue during incremental Reanimated migrations
• Avoid common pitfalls like infinite loops and unnecessary re-renders
• Maintain 60fps performance while syncing values across animation systems
• Use useAnimatedReaction and listeners for bidirectional synchronization

The article reveals a specific hook pattern that prevents the most common synchronization bug developers hit within hours of attempting this.