Laravel download CSV string as file

Controller.php

<?php

$csv = \App\Services\DataExportService::createCsvExport();
$BOM = "\xEF\xBB\xBF";

return response()->streamDownload(
  function () use ($BOM, $csv) {
     echo $BOM . $csv;
  },
  'data-export.csv',
  [
     'Content-Type' => 'application/octet-stream',
     'Content-Disposition' => 'attachment; filename="data-export.csv',
     'Content-Encoding: UTF-8',
  ],
);