Enum ButtonSet

// Display a dialog box with a message and "Yes" and "No" buttons. const ui = DocumentApp.getUi(); const response = ui.alert(     'Are you sure you want to continue?',     ui.ButtonSet.YES_NO, );  // Process the user's response. if (response === ui.Button.YES) {   Logger.log('The user clicked "Yes."'); } else {   Logger.log('The user clicked "No" or the dialog\'s close button.'); }