Google sheets script get list of files in gdrive

gcode.gs

function listFilesInFolder(id) {
  var folder = DriveApp.getFolderById('MyFolderID');
  var contents = folder.getFiles();
  var file;
  var name;
  var sheet = SpreadsheetApp.getActiveSheet();
  var date;
  var size;

  sheet.clear();
  sheet.appendRow(["Nome", "Data", "Dimensione"]);


  while(contents.hasNext()) {
    file = contents.next();
    name = file.getName();
    date = file.getDateCreated()
    size = file.getSize()

    data = [name, date, size]
    sheet.appendRow(data);
  }
};