Source: modules/editor/js/editor.dialog.es6.js

/**
 * @file
 * AJAX commands used by Editor module.
 */

(function ($, Drupal) {
  /**
   * Command to save the contents of an editor-provided modal.
   *
   * This command does not close the open modal. It should be followed by a
   * call to `Drupal.AjaxCommands.prototype.closeDialog`. Editors that are
   * integrated with dialogs must independently listen for an
   * `editor:dialogsave` event to save the changes into the contents of their
   * interface.
   *
   * @param {Drupal.Ajax} [ajax]
   *   The Drupal.Ajax object.
   * @param {object} response
   *   The server response from the ajax request.
   * @param {Array} response.values
   *   The values that were saved.
   * @param {number} [status]
   *   The status code from the ajax request.
   *
   * @fires event:editor:dialogsave
   */
  Drupal.AjaxCommands.prototype.editorDialogSave = function (
    ajax,
    response,
    status,
  ) {
    $(window).trigger('editor:dialogsave', [response.values]);
  };
})(jQuery, Drupal);