import { Button } from 'antd';
import React from 'react';
import Loadable from 'react-loadable';
import './App.css';
import logo from './logo.svg';
// import A from './A';
function MyLoadingComponent() {
  return <div>Loading...</div>;
}

const A = Loadable({
  loader: () => import("./A"),
  loading: MyLoadingComponent
});

const App: React.FC = () => {
  const [show, change] = React.useState(false)
  const a = show && <A />
  return (
    <div className="App">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        <p>
          Edit <code>src/App.tsx</code> and save to reload
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
        >
          Learn React
        </a>
        <Button onClick={()=>change(true)}>change</Button>
        { a }
      </header>
    </div>
  );
}

export default App