react-tween-state is an animation utility for React applications that enables smooth interpolation of component state values over time. It provides a `this.tweenState` method, which functions similarly to `this.setState`, but initiates an animated transition of a state property to a target value over a specified duration. The library relies heavily on React's deprecated mixin system (`React.createClass`) for integration into components. The current and likely final stable version is 0.1.5, released in 2016, and the project has been unmaintained since then. Its core differentiators, such as direct state manipulation via mixins and an imperative `tweenState` API, are now considered anti-patterns in modern React development, which favors declarative component-based animation libraries and hooks. It does not support newer React features or functional components.
npm install react-tween-stateVerified import paths — ran on the pinned version, not inferred.
Demonstrates how to integrate `react-tween-state` using a `React.createClass` component with its mixin, animate a state property (`left`), and retrieve the tweening value during render. This requires an older React setup.
Use modern animation libraries like `react-spring`, `framer-motion`, or `react-transition-group` that are compatible with class components and functional components/hooks.
Migrate to an actively maintained animation library compatible with your React version.
Consider using an animation library that provides first-party TypeScript support or migrate to JavaScript for the animation logic if sticking with `react-tween-state` is unavoidable.
Always retrieve the animated value using `this.getTweeningValue(path)` within your `render` method, not directly from `this.state[path]`, when an animation is in progress.
This library is incompatible with modern React. You must downgrade your React version to v15 or earlier, or preferably, choose a modern animation library that uses class components or functional components/hooks.
See the fix for `TypeError: React.createClass is not a function`. The library cannot be used with modern React versions due to its reliance on deprecated features.
Ensure your component is defined using `React.createClass` and includes `tweenState.Mixin` in its `mixins` array. Example: `var App = React.createClass({ mixins: [tweenState.Mixin], /* ... */ });`This library is designed for CommonJS environments. For browser usage, you need to use a module bundler to process the `require()` calls or ensure the library is included via a script tag in a way that exposes `tweenState` globally, though a bundler is the standard approach.