require 'vendor/autoload.php';

    use PhpOfficePhpSpreadsheetSpreadsheet;
    use PhpOfficePhpSpreadsheetWriterXlsx;

    $spreadsheet = new Spreadsheet();
    $sheet = $spreadsheet->getActiveSheet();
    $sheet->setCellValue('A1', 'Hello World !');

    $writer = new Xlsx($spreadsheet);
    $writer = PhpOfficePhpSpreadsheetIOFactory::createWriter($spreadsheet, 'Xlsx');

    header('Content-Type: application/vnd.ms-excel');
    header('Content-Disposition: attachment; filename="hello_world.xlsx"');
    $writer->save("php://output");

PHP Warning:  ZipArchive::close(): Failure to create temporary file: No such file or directory in /Users/sg/GitWorkingCopies/xxx1/xxx2/library/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx.php on line 374
    PHP Fatal error:  Uncaught exception 'PhpOfficePhpSpreadsheetWriterException' with message 'Could not close zip file php://output.' in /Users/sg/GitWorkingCopies/xxx1/xxx2/library/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx.php:375