Target class [App\Http\Controllers\Auth\LoginController] does not exist - laravel

Question

I am using Laravel9, trying to seperate frontend and backend. I did many replace, like app\Http change to be app\Frontend\Http or app\Backend\Http.
I did the separation before, it worked. Now I cannot login or logout. But welcome page is ok. Maybe this is because the routes file ?
Auth::routes();
All content of routes/web.php
<?php
use Illuminate\Support\Facades\Route;
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
Route::group(
[
'prefix' => LaravelLocalization::setLocale(),
'middleware' => [ 'localeSessionRedirect', 'localizationRedirect', 'localeViewPath' ],
], function()
{
Route::get('/', function () {
return view('welcome');
});
Auth::routes();
Route::get('/home', [App\Frontend\Http\Controllers\HomeController::class, 'index'])->name('home');
});
I also did:
composer dump-autoload
php artisan clear-compiled
php artisan route:clear
php artisan cache:clear
not working.
LoginController
<?php
namespace App\Frontend\Http\Controllers\Auth;
use App\Frontend\Http\Controllers\Controller;
use App\Frontend\Providers\RouteServiceProvider;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
class LoginController extends Controller
...

Answer 1

Auth routes of laravel/ui package is kinda hardcoded within AuthRouteMethods class. This is the part of its method from Github repository
$namespace = class_exists($this->prependGroupNamespace('Auth\LoginController')) ? null : 'App\Http\Controllers';
$this->group(['namespace' => $namespace], function() use($options) {
// Login Routes...
if ($options['login'] ?? true) {
$this->get('login', 'Auth\LoginController#showLoginForm')->name('login');
$this->post('login', 'Auth\LoginController#login');
}
// more code
It ensure that Auth routes will be under "default" namespace of Theme\Http\Controllers. But you may change it if wrap it in a group like
Route::group(['namespace' => 'App\Frontend\Http\Controllers'], function () {
Auth::routes();
});
This way you'll prepend group namespace to it so package will find App\Frontend\Http\Controllers\Auth\LoginController class and so on for every other auth controller
Note 1 - all controllers should be under Auth namespace and named specifically as defined in a package, you cannot change it to be like App\Whatever\LoginController or Auth\Whatever\Auth\MyLoginController - but you can do it with App\Whatever\Auth\LoginController
Note 2 - this wouldn't work with uncommented protected $namespace = 'App\\Http\\Controllers'; property within RouteServiceProvider class, as it will prepend namespace twice (you will get something like App\Http\Controllers\App\Frontend\Http\Controllers\Auth\LoginController)