text: import * as React from "react";
  import CssBaseline from "@material-ui/core/CssBaseline";
  import { BrowserRouter as Router, Route } from "react-router-dom";
  
  type Props = {
    children: React.Node
  };
  
  export default class App extends React.Component<Props> {
    props: Props;
  
    render() {
      const { children } = this.props;
      return (
        <Router>
          <React.Fragment>
            <CssBaseline />
            {children}
          </React.Fragment>
        </Router>
      );
    }
  }
  