<?php

namespace AlexxosipovCart;

use IlluminateSupportServiceProvider;


class CartServiceProvider extends ServiceProvider {
    public function boot() {

    }

    public function register() {
        $this->app->singleton('cart', function() {
            return new AlexxosipovCartCart;
        });
    }
}

<?php

namespace AlexxosipovCart;

use IlluminateSupportFacadesCookie;
use AppCart as CartModel;
use IlluminateHttpRequest;
use IlluminateSupportFacadesAuth;
class Cart
{
   public function __construct(Request $request)
   {
      ...
   }
   ...
}