Transition Group

React Transition Group is a popular animation library that enables transitions and animations when React components mount, unmount, or update. It provides fine-grained control over enter and exit states, helping developers animate component lifecycles without relying on external animation frameworks.

The library exports several components, including:

• <Transition>: Handles a single transition state (enter/exit)

• <CSSTransition>: Applies CSS class names at different stages of the lifecycle (e.g., fade-enter, fade-enter-active)

• <TransitionGroup>: Manages a list of transitioning components, often used with dynamic lists

Example usage with CSSTransition:

jsx
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<CSSTransition
  in={isVisible}
  timeout={300}
  classNames="fade"
  unmountOnExit
>
  <div className="box">Hello</div>
</CSSTransition>
CSS:
css
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.fade-enter {
  opacity: 0;
}
.fade-enter-active {
  opacity: 1;
  transition: opacity 300ms ease-in;
}

This setup will animate the box’s entrance and exit based on the isVisible flag. Because the animations are tied to the component lifecycle, this approach ensures smooth, declarative animations that work well within React’s rendering model.

React Transition Group is especially useful for:

• Page transitions

• Modals and overlays

• Notifications

• List item animations

While libraries like Framer Motion provide more advanced capabilities, React Transition Group remains lightweight and effective for straightforward UI transitions.

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