react-use/src/useHover.ts

import * as React from 'react';
import {useState} from './react';

const noop = () => {};

export type Element = ((state: boolean) => React.ReactElement<any>) | React.ReactElement<any>;

const useHover = (element: Element): [React.ReactElement<any>, boolean] => {
  const [state, setState] = useState(false);

  const onMouseEnter = (originalOnMouseEnter?: any) => (event: any) => {
    (originalOnMouseEnter || noop)(event);
    setState(true);
  };
  const onMouseLeave = (originalOnMouseLeave?: any) => (event: any) => {
    (originalOnMouseLeave || noop)(event);
    setState(false);
  };

  if (typeof element === 'function') {
    element = element(state);
  }

  const el = React.cloneElement(element, {
    onMouseEnter: onMouseEnter(element.props.onMouseEnter),
    onMouseLeave: onMouseLeave(element.props.onMouseLeave)
  });

  return [el, state];
};

export default useHover;