content: import React from 'react';
  import { singlePropFrom } from './CustomPropTypes';
  
  const propList = ['children', 'value'];
  
  export default function valueValidation(props, propName, componentName) {
    let error = singlePropFrom(propList)(props, propName, componentName);
  
    if (!error) {
      error = React.PropTypes.node(props, propName, componentName);
    }
  
    return error;
  }
  