Custom route configuration in laravel 11

<?php

use Illuminate\Foundation\Application;

use Illuminate\Foundation\Configuration\Exceptions;

use Illuminate\Foundation\Configuration\Middleware;

use Illuminate\Support\Facades\Route;

return Application::configure(basePath: dirname(__DIR__))

->withRouting(

web: __DIR__.'/../routes/web.php',

commands: __DIR__.'/../routes/console.php',

health: '/up',

then:function(){

Route::group(['prefix'=>'admin'],base_path('routes/admin.php'));

}

)

->withMiddleware(function (Middleware $middleware) {

//

})

->withExceptions(function (Exceptions $exceptions) {

//

})->create();