mirocow\eav\handlers\OptionValueHandler::defaultValue PHP Method

    public function defaultValue()
    {
        $defaultOptions = [];
        foreach ($this->attributeHandler->attributeModel->eavOptions as $option) {
            if ($option->defaultOptionId === 1) {
                $defaultOptions[] = $option->id;
            }
        }
        return $defaultOptions;
    }