react-08.jsx

class MyComponent extends Component {
  render() {
    return <main>Awesome component</main>;
  }
}

MyComponent.propTypes = { 
  count: PropTypes.number.isRequired,
  items: PropTypes.arrayOf(
      PropTypes.shape({
        id: PropTypes.number,
        title: PropTypes.string,
        isRegisterd: PropTypes.bool
      })
    )
};

MyComponent.defaultProps = { count: 0 };