Is that possible to enable/disable WithHeading concerns conditionally

[convers39]

I am splitting a large dataset into several export files, only the first file needs a heading row as I will merge them together.

I have WithHeading concern, and use a flag to check if I need the heading row, if not I return an empty array.

    public function headings(): array
    {
        if ($this->is_chunked) {
            return [];
        }
        switch ($this->data_type) {
            // ...
        }
    }

But it seems the empty array still takes 1 empty row in the export file..

Is that possible to disable the headings conditionally?

[convers39]

OK I read the source and realize it should be something else, and I found the problem that I manually add a \n when merging the files. This could be closed.