Combine CSV Files with Google Apps Script - Prevent the column headers from being repeated in the merged CSV file

Code.gs

function combineCSVWithoutRepeatedHeaders() {
  const folder = DriveApp.getFolderById("1MBaI_rGJ6t_loANMAvGpDbr2MeHZwxnn");
  const files = folder.getFilesByType(MimeType.CSV);
  let combinedData = [];
  let firstFile = true;

  while (files.hasNext()) {
    let file = files.next();
    let csvData = Utilities.parseCsv(file.getBlob().getDataAsString());

    if (firstFile) {
      firstFile = false; // Skip headers for the first file
    } else {
      csvData.shift(); // Remove headers for subsequent files
    }
    combinedData = combinedData.concat(csvData);
  }
  folder.createFile("Combined1.csv", combinedData.join("\n"), MimeType.CSV);
}