# reactjs/react-transition-group

An easy way to perform animations when a React component enters or leaves the DOM

Repository: https://github.com/reactjs/react-transition-group
Canonical: https://ross.abutalabs.com/products/react-transition-group
Homepage: https://reactcommunity.org/react-transition-group/
Language: JavaScript
License: NOASSERTION
License Family: other
Last push: 2026-03-05T03:43:36+00:00

## Health v2 (maintenance only)
Score: 54/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 70, release rhythm 8, longevity 100
- inputs: {"age_days": 3573, "days_push": 181, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 10228, forks 639 (observed 2026-08-28T04:10:41.142253+00:00)

## What it is
A small React component library (Transition, CSSTransition, SwitchTransition, TransitionGroup) that manages component mounting/unmounting states over time to make enter/exit animations easy. It exposes transition stages and manages classes rather than animating styles itself.

## Use cases
- animate react components entering and leaving the dom
- add css transitions on mount and unmount in react
- fade in and out lists when items are added or removed
- manage transition lifecycle stages for react components
- replace react-addons-css-transition-group in modern react

## When to choose
- you use React and want declarative enter/exit transitions with CSS classes
- you need fine control over transition stages without a full animation engine
- you want a tiny dependency for mount/unmount animation state

## When to avoid
- you want a library that animates styles for you, like react-spring or framer-motion
- you are not using React
- you need complex physics-based or gesture-driven animations

## Facets
- artifact type: library
- maturity: maintenance
- function: animation, ui-components, state-management
- domain: frontend, web-development, web-design
- platform: browser, cross-platform
- tags: react, css-transitions, enter-exit-animations, transition-management, nodejs

## Member repositories
- reactjs/react-transition-group (main) score 54

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:41.142253+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:19:29.195597+00:00, confidence not recorded.
  - readme: https://github.com/reactjs/react-transition-group (fetched 2026-08-28T04:10:41.142253+00:00, sha 9652dfe95bfd)
  - homepage: https://reactcommunity.org/react-transition-group/ (fetched 2026-08-29T08:19:16.378016+00:00, sha beb32a3ab0a1)
  - registry_npm: https://registry.npmjs.org/react-transition-group (fetched 2026-08-29T08:19:16.380457+00:00, sha f88ccfada9f6)
- Data as of 2026-08-30T08:39:29.467469+00:00.