content: 
  import PropTypes from 'prop-types';
  
  import React, { Component } from 'react';
  import {
    View,
    ViewPropTypes
  } from 'react-native'
  
  class Circle extends Component {
    static propTypes = {
      size: PropTypes.number.isRequired,
      style: ViewPropTypes.style        // style
    };
  
    render() {
      return (
        <View style={[
          circleStyle(this.props.size),
          this.props.style
        ]}>
          {this.props.children}
        </View>
      )
    }
  }
  
  function circleStyle (size) {
    return {
      width: size,
      height: size,
      borderRadius: size / 2,
      alignItems: 'center',
      justifyContent: 'center'
    }
  }
  
  module.exports = {
    Circle
  }
  