app-component.js

import ReactDOM from 'react-dom';
import Menus from './Menus';

ReactDOM.render(
  Menus,
  document.getElementById('root');
);

some-component.js

import React from 'react';

class Menus extends React.Component {
  render() {
    return (
      <Menu items={items} />
    );
  }
}

export default class Menus;