FluidTYPO3\Vhs\ViewHelpers\Condition\String\ContainsViewHelper::initializeArguments PHP Method

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('haystack', 'string', 'haystack', true);
        $this->registerArgument('needle', 'string', 'need', true);
    }