React Transition Group manages component enter/exit transitions. Here's how to use it.
Installation
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CSSTransition
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Transition States
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Custom Class Names
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TransitionGroup
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SwitchTransition
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Transition Component
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Modal Animation
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Route Transitions
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Best Practices
Usage:
✓ Use CSSTransition for CSS animations
✓ Use Transition for JS animations
✓ Use TransitionGroup for lists
✓ Use SwitchTransition for swapping
Performance:
✓ Use transform and opacity
✓ Add will-change cautiously
✓ Use unmountOnExit to clean up
✓ Match CSS and timeout values
Accessibility:
✓ Respect prefers-reduced-motion
✓ Keep animations brief
✓ Don't rely solely on animation
✓ Test with screen readers
Avoid:
✗ Animating layout properties
✗ Very long animations
✗ Animations on page load
✗ Too many simultaneous animations
Conclusion
React Transition Group provides low-level primitives for component transitions. Use CSSTransition for declarative CSS-based animations, Transition for JavaScript-controlled animations, and TransitionGroup for animating lists. Combine with SwitchTransition for smooth content switching.