Combine CSV files with Google Apps Script

Code.gs

function combineCsv() {
  const folder = DriveApp.getFolderById("1MBaI_rGJ6t_loANMAvGpDbr2MeHZwxnn");
  const files = folder.getFilesByType(MimeType.CSV);
  let combinedData = [];
   
  while(files.hasNext()){
    let file = files.next();
    let csvData = Utilities.parseCsv(file.getBlob().getDataAsString());
    combinedData = combinedData.concat(csvData);
  }
  folder.createFile("Combined.csv", combinedData.join("\n"),MimeType.CSV);
 }