Lazy export of DataTable

BaseDataTable.php

<?php

namespace App\DataTables;

use Yajra\DataTables\Html\Button;
use Yajra\DataTables\Services\DataTable;

class BaseDataTable extends DataTable
{
    protected $exportClass = LazyDataTablesExportHandler::class;
  
    protected function buildExcelFile()
    {
        $source = app()->call([$this, 'query']);
        $source = $this->applyScopes($source);

        $dataTable = app()->call([$this, 'dataTable'], compact('source'));
        $dataTable->skipPaging();
        $query = $dataTable->getFilteredQuery();

        $dataForExport = $query->cursor();

        return new $this->exportClass($dataForExport);
    }
}

LazyDataTableExportHandler.php

<?php

namespace App\DataTables;

use Illuminate\Support\LazyCollection;
use Maatwebsite\Excel\Concerns\Exportable;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\WithHeadings;

class LazyDataTablesExportHandler implements FromCollection, WithHeadings
{
    use Exportable;

    /**
     * @var LazyCollection
     */
    protected $collection;

    /**
     * LazyDataTablesExportHandler constructor.
     *
     * @param LazyCollection $collection
     */
    public function __construct(LazyCollection $collection)
    {
        $this->collection = $collection;
    }

    /**
     * @return LazyCollection
     */
    public function collection()
    {
        return $this->collection;
    }

    /**
     * @return array
     */
    public function headings(): array
    {
        $first = $this->collection->first();
        if ($first) {
            return array_keys($first->toArray());
        }

        return [];
    }
}