namespace Webfan\Transform;

interface TransformInterface
 {
	const RIGHT = 1;
	const LEFT = -1;	
    public function detect($payload) : int;
    public function up($payload);	
	public function down($payload); 
	public function __invoke($payload);
 }

Examples in the RemoteObjects API:

use Webfan\Transform\Sequence;
use Webfan\Transform\UrlsafeBinaryTransform;
use Webfan\Transform\OpisTranform;
use Webfan\Transform\TransformCallbacks;

Transform in the registry