content: import React from 'react';
  import PropTypes from 'prop-types';
  
  /** A Hello World component */
  const HelloWorld = ({ message }) => {
      return <div>Hello {message}</div>;
  };
  
  HelloWorld.propTypes =  {
      /** Message to display */
      message: PropTypes.string.isRequired
  };
  
  HelloWorld.defaultProps = {
      message: 'World'
  };
  
  export default HelloWorld;