Transphporm\Config::registerPseudo PHP Method

    public function registerPseudo(Pseudo $pseudo)
    {
        $this->pseudo[] = $pseudo;
    }

 public function load(\Transphporm\Config $config)
 {
     $config->registerPseudo(new \Transphporm\Pseudo\Attribute());
     $config->registerPseudo(new \Transphporm\Pseudo\Nth());
     $config->registerPseudo(new \Transphporm\Pseudo\Not($config->getCssToXpath()));
 }