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