这个是flow的语法吗？需要在babel中配置啥plugin？

/* @flow */

import React, { PureComponent, Children } from 'react'; import PropTypes from 'prop-types'; import { TouchableNativeFeedback, TouchableOpacity, Platform, View, } from 'react-native'; import type { Style } from './TabViewTypeDefinitions';

const LOLLIPOP = 21;

type Props = { delayPressIn?: number, borderless?: boolean, pressColor?: string, pressOpacity?: number, children?: React.Element, style?: Style, };

type DefaultProps = { pressColor: string, };

export default class TouchableItem extends PureComponent<DefaultProps, Props, void> { static propTypes = { delayPressIn: PropTypes.number, borderless: PropTypes.bool, pressColor: PropTypes.string, pressOpacity: PropTypes.number, children: PropTypes.node.isRequired, style: View.propTypes.style, };

static defaultProps = { pressColor: 'rgba(255, 255, 255, .4)', };

render() { const { style, pressOpacity, pressColor, borderless, ...rest } = this.props;

if (Platform.OS === 'android' && Platform.Version >= LOLLIPOP) {
  return (
    <TouchableNativeFeedback
      {...rest}
      background={TouchableNativeFeedback.Ripple(pressColor, borderless)}
    >
      <View style={style}>
        {Children.only(this.props.children)}
      </View>
    </TouchableNativeFeedback>
  );
} else {
  return (
    <TouchableOpacity {...rest} style={style} activeOpacity={pressOpacity}>
      {this.props.children}
    </TouchableOpacity>
  );
}

} }