Move auth routes to userland code in Laravel 5.3

auth.php

# routes/auth.php

<?php

/**
 * Auth routes copied from Illuminate\Routing\Router::auth()
 */

// Authentication Routes...
Route::get('login', 'LoginController@showLoginForm')->name('login');
Route::post('login', 'LoginController@login');
Route::post('logout', 'LoginController@logout');

// Registration Routes...
Route::get('register', 'RegisterController@showRegistrationForm');
Route::post('register', 'RegisterController@register');

// Password Reset Routes...
Route::get('password/reset', 'ForgotPasswordController@showLinkRequestForm');
Route::post('password/email', 'ForgotPasswordController@sendResetLinkEmail');
Route::get('password/reset/{token}', 'ResetPasswordController@showResetForm');
Route::post('password/reset', 'ResetPasswordController@reset');

RouteServiceProvider.php

# app/providers/RouteServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Facades\Route;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;

class RouteServiceProvider extends ServiceProvider
{
    /**
     * This namespace is applied to your controller routes.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $namespace = 'App\Http\Controllers';

    /**
     * @var string
     */
    protected $authNamespace = 'App\Http\Controllers\Auth';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @return void
     */
    public function boot()
    {
        //

        parent::boot();
    }

    /**
     * Define the routes for the application.
     *
     * @return void
     */
    public function map()
    {
        $this->mapApiRoutes();

        $this->mapWebRoutes();

        $this->mapAuthRoutes();
    }

    /**
     * Define the "web" routes for the application.
     *
     * These routes all receive session state, CSRF protection, etc.
     *
     * @return void
     */
    protected function mapWebRoutes()
    {
        Route::group([
            'middleware' => 'web',
            'namespace' => $this->namespace,
        ], function ($router) {
            require base_path('routes/web.php');
        });
    }

    /**
     * Define the "auth" routes for the application.
     *
     * @return void
     */
    protected function mapAuthRoutes()
    {
        Route::group([
            'middleware' => 'web',
            'namespace' => $this->authNamespace,
        ], function ($router) {
            require base_path('routes/auth.php');
        });
    }

    /**
     * Define the "api" routes for the application.
     *
     * These routes are typically stateless.
     *
     * @return void
     */
    protected function mapApiRoutes()
    {
        Route::group([
            'middleware' => 'api',
            'namespace' => $this->namespace,
            'prefix' => 'api',
        ], function ($router) {
            require base_path('routes/api.php');
        });
    }
}