Nayjest\Grids\Components\ExcelExport::getOnFileCreate PHP Method

    public function getOnFileCreate()
    {
        if ($this->on_file_create === null) {
            $this->on_file_create = function (LaravelExcelWriter $excel) {
                $excel->sheet($this->getSheetName(), $this->getOnSheetCreate());
            };
        }
        return $this->on_file_create;
    }