content: import _extends from "@babel/runtime/helpers/esm/extends";
  import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";
  import React from 'react';
  import PropTypes from 'prop-types';
  import { Transition } from 'react-transition-group';
  import { duration } from '../styles/transitions';
  import useTheme from '../styles/useTheme';
  import { reflow, getTransitionProps } from '../transitions/utils';
  import useForkRef from '../utils/useForkRef';
  var styles = {
    entering: {
      opacity: 1
    },
    entered: {
      opacity: 1
    }
  };
  var defaultTimeout = {
    enter: duration.enteringScreen,
    exit: duration.leavingScreen
  };
  /**
   * The Fade transition is used by the [Modal](/components/modal/) component.
   * It uses [react-transition-group](https://github.com/reactjs/react-transition-group) internally.
   */
  
  var Fade = React.forwardRef(function Fade(props, ref) {
    var children = props.children,
        inProp = props.in,
        onEnter = props.onEnter,
        onExit = props.onExit,
        style = props.style,
        _props$timeout = props.timeout,
        timeout = _props$timeout === void 0 ? defaultTimeout : _props$timeout,
        other = _objectWithoutProperties(props, ["children", "in", "onEnter", "onExit", "style", "timeout"]);
  
    var theme = useTheme();
    var handleRef = useForkRef(children.ref, ref);
  
    var handleEnter = function handleEnter(node, isAppearing) {
      reflow(node); // So the animation always start from the start.
  
      var transitionProps = getTransitionProps({
        style: style,
        timeout: timeout
      }, {
        mode: 'enter'
      });
      node.style.webkitTransition = theme.transitions.create('opacity', transitionProps);
      node.style.transition = theme.transitions.create('opacity', transitionProps);
  
      if (onEnter) {
        onEnter(node, isAppearing);
      }
    };
  
    var handleExit = function handleExit(node) {
      var transitionProps = getTransitionProps({
        style: style,
        timeout: timeout
      }, {
        mode: 'exit'
      });
      node.style.webkitTransition = theme.transitions.create('opacity', transitionProps);
      node.style.transition = theme.transitions.create('opacity', transitionProps);
  
      if (onExit) {
        onExit(node);
      }
    };
  
    return React.createElement(Transition, _extends({
      appear: true,
      in: inProp,
      onEnter: handleEnter,
      onExit: handleExit,
      timeout: timeout
    }, other), function (state, childProps) {
      return React.cloneElement(children, _extends({
        style: _extends({
          opacity: 0,
          visibility: state === 'exited' && !inProp ? 'hidden' : undefined
        }, styles[state], {}, style, {}, children.props.style),
        ref: handleRef
      }, childProps));
    });
  });
  process.env.NODE_ENV !== "production" ? Fade.propTypes = {
    /**
     * A single child content element.
     */
    children: PropTypes.element,
  
    /**
     * If `true`, the component will transition in.
     */
    in: PropTypes.bool,
  
    /**
     * @ignore
     */
    onEnter: PropTypes.func,
  
    /**
     * @ignore
     */
    onExit: PropTypes.func,
  
    /**
     * @ignore
     */
    style: PropTypes.object,
  
    /**
     * The duration for the transition, in milliseconds.
     * You may specify a single timeout for all transitions, or individually with an object.
     */
    timeout: PropTypes.oneOfType([PropTypes.number, PropTypes.shape({
      enter: PropTypes.number,
      exit: PropTypes.number
    })])
  } : void 0;
  export default Fade;