FluidTYPO3\Vhs\ViewHelpers\Condition\Type\IsInstanceOfViewHelper::initializeArguments PHP Метод

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('value', 'mixed', 'value to check', true);
        $this->registerArgument('class', 'mixed', 'className to check against', true);
    }