google apps script to turn docs into pdfs

Code.gs

function getDocs() {
  var folderId= '<<PUT YOUR FOLDER ID HERE>>';
  
  var pdfFolder = DriveApp.getFolderById(folderId).createFolder('PDFs');
  var files = DriveApp.getFolderById(folderId).getFilesByType(MimeType.GOOGLE_DOCS);
  
  while(files.hasNext()) {
    var file = files.next();
    
    var pdf = file.getAs('application/pdf');
    
    pdfFolder.createFile(pdf.copyBlob());
  }
}