react-lifecycles-compat

What is react-lifecycles-compat?

The react-lifecycles-compat npm package is designed to polyfill the new React lifecycle methods to work with older versions of React (versions 0.14.9 to 16.2). This allows developers to use new features of React like getDerivedStateFromProps and getSnapshotBeforeUpdate in their existing projects without needing to completely refactor their components for newer React versions.

What are react-lifecycles-compat's main functionalities?

Polyfill for getDerivedStateFromProps

This feature allows the use of getDerivedStateFromProps in components that are part of projects using older versions of React. The polyfill function modifies the component to use this lifecycle method correctly even if the React version originally does not support it.

import { polyfill } from 'react-lifecycles-compat';

class MyComponent extends React.Component {
  static getDerivedStateFromProps(nextProps, prevState) {
    if (nextProps.value !== prevState.value) {
      return {
        value: nextProps.value
      };
    }
    return null;
  }
}

polyfill(MyComponent);
export default MyComponent;

Polyfill for getSnapshotBeforeUpdate

This feature enables the use of getSnapshotBeforeUpdate, which is useful for capturing some information from the DOM before it is potentially changed due to updates. The polyfill ensures it can be used in older React versions.

import { polyfill } from 'react-lifecycles-compat';

class MyComponent extends React.Component {
  getSnapshotBeforeUpdate(prevProps, prevState) {
    if (prevProps.list.length < this.props.list.length) {
      const listDiff = this.props.list.length - prevProps.list.length;
      return { listDiff: listDiff };
    }
    return null;
  }
  componentDidUpdate(prevProps, prevState, snapshot) {
    if (snapshot !== null) {
      console.log('List length increased by', snapshot.listDiff);
    }
  }
}

polyfill(MyComponent);
export default MyComponent;

Other packages similar to react-lifecycles-compat

react-lifecycle-component

This package offers a set of components that manage lifecycle methods in a more declarative way. While it provides similar lifecycle management capabilities, it does not specifically target compatibility issues between different React versions like react-lifecycles-compat does.

README

The README file is missing