use http\{
Client, Client\Request, Client\Response
};
-use React\Promise\ExtendedPromiseInterface;
use seekat\API;
use SplObserver;
use SplSubject;
-class Deferred extends \React\Promise\Deferred implements SplObserver
+final class Deferred extends \React\Promise\Deferred implements SplObserver
{
/**
* The response importer