text: import { createAppContainer, createSwitchNavigator } from "react-navigation";
  
  import Login from "./pages/Login";
  import List from "./pages/List";
  import Book from "./pages/Book";
  
  const Routes = createAppContainer(
    createSwitchNavigator({
      Login,
      List,
      Book
    })
  );
  
  export default Routes;
  