text: import classNames from 'classnames';
  import React from 'react';
  import PropTypes from 'prop-types';
  import Transition from 'react-overlays/lib/Transition';
  
  const propTypes = {
    /**
     * Show the component; triggers the fade in or fade out animation
     */
    in: PropTypes.bool,
  
    /**
     * Wait until the first "enter" transition to mount the component (add it to the DOM)
     */
    mountOnEnter: PropTypes.bool,
  
    /**
     * Unmount the component (remove it from the DOM) when it is faded out
     */
    unmountOnExit: PropTypes.bool,
  
    /**
     * Run the fade in animation when the component mounts, if it is initially
     * shown
     */
    transitionAppear: PropTypes.bool,
  
    /**
     * Duration of the fade animation in milliseconds, to ensure that finishing
     * callbacks are fired even if the original browser transition end events are
     * canceled
     */
    timeout: PropTypes.number,
  
    /**
     * Callback fired before the component fades in
     */
    onEnter: PropTypes.func,
    /**
     * Callback fired after the component starts to fade in
     */
    onEntering: PropTypes.func,
    /**
     * Callback fired after the has component faded in
     */
    onEntered: PropTypes.func,
    /**
     * Callback fired before the component fades out
     */
    onExit: PropTypes.func,
    /**
     * Callback fired after the component starts to fade out
     */
    onExiting: PropTypes.func,
    /**
     * Callback fired after the component has faded out
     */
    onExited: PropTypes.func,
  };
  
  const defaultProps = {
    in: false,
    timeout: 300,
    mountOnEnter: false,
    unmountOnExit: false,
    transitionAppear: false,
  };
  
  class Fade extends React.Component {
    render() {
      return (
        <Transition
          {...this.props}
          className={classNames(this.props.className, 'fade')}
          enteredClassName="in"
          enteringClassName="in"
        />
      );
    }
  }
  
  Fade.propTypes = propTypes;
  Fade.defaultProps = defaultProps;
  
  export default Fade;
  