Google Apps Script for converting all slide decks in a folder to PDF

Code.gs

function convertSlidesInFolderToPdf(fromFolderId, destinationFolderId) {
  const folder = DriveApp.getFolderById(fromFolderId);
  const destinationFolder = DriveApp.getFolderById(destinationFolderId);
  const files = folder.getFilesByType(MimeType.GOOGLE_SLIDES);

  while (files.hasNext()) {
    const file = files.next();
    const deck = DriveApp.getFileById(file.getId());
    const pdfBlob = deck.getBlob().setName(file.getName() + ".pdf").getAs('application/pdf');
    destinationFolder.createFile(pdfBlob);
  }
}