FluidTYPO3\Vhs\ViewHelpers\Render\AbstractRenderViewHelper::initializeArguments PHP Method

    public function initializeArguments()
    {
        $this->registerArgument('onError', 'string', 'Optional error message to display if error occur while rendering. If NULL, lets the error Exception ' . 'pass trough (and break rendering)', false, null);
        $this->registerArgument('graceful', 'boolean', 'If forced to FALSE, errors are not caught but rather "transmitted" as every other error would be', false, false);
    }