Custom response class with `withCookies` helper method for Slim 4

app.php

<?php declare(strict_types=1);
namespace App;

use Psr\Http\Message\ResponseFactoryInterface;
use Psr\Http\Message\ResponseInterface as Response;
use Slim\Psr7\Response as BaseResponse;
use Slim\Psr7\Cookies;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

require '../vendor/autoload.php';

class CustomResponse extends BaseResponse {
    public function withCookies(Cookies $cookies) : self {
        return $this->withHeader('Set-Cookie', $cookies->toHeaders());
    }
}

class ResponseFactory implements ResponseFactoryInterface {
    public function createResponse(int $code = 200, string $reasonPhrase = '') : Response {
        return (new CustomResponse())->withStatus($code, $reasonPhrase);
    }
}

$app = AppFactory::create(new ResponseFactory());

$app->get('/path', function (Request $request, Response $response) : Response {
    $cookies = (new Cookies())
        ->set('some-cookie-name', [
            'value'   => 'some-cookie-value',
            'path'    => $request->getUri()->getPath(),
            'expires' => time() + 3600,
        ])
        ->set('foo', 'bar');

    $response->getBody()->write('Hello world (check cookies)');
    return $response->withCookies($cookies);
});

$app->run();