content: import React from 'react';
  
  const horizontal = React.PropTypes.oneOf(['left', 'middle', 'right']);
  const vertical = React.PropTypes.oneOf(['top', 'center', 'bottom']);
  
  export default {
  
    corners: React.PropTypes.oneOf([
      'bottom-left',
      'bottom-right',
      'top-left',
      'top-right',
    ]),
  
    horizontal: horizontal,
  
    vertical: vertical,
  
    origin: React.PropTypes.shape({
      horizontal: horizontal,
      vertical: vertical,
    }),
  
    cornersAndCenter: React.PropTypes.oneOf([
      'bottom-center',
      'bottom-left',
      'bottom-right',
      'top-center',
      'top-left',
      'top-right',
    ]),
  
    stringOrNumber: React.PropTypes.oneOfType([
      React.PropTypes.string,
      React.PropTypes.number,
    ]),
  
    zDepth: React.PropTypes.oneOf([0, 1, 2, 3, 4, 5]),
  
  };
  