content: import React from 'react';
  import PropTypes from 'prop-types';
  
  class Photo extends React.Component {
    static propTypes = {
      source: PropTypes.string.isRequired,
      altText: PropTypes.string.isRequired,
    };
    render() {
      const { source, altText } = this.props;
      return <img src={source} alt={altText} />;
    }
  }
  
  export default Photo;