https://www.iisd.org/themes/iisd-shared/iisd_base/assets/js/jquery4-compat.js?v=1

1/**
2 * @file
3 * Restores jQuery helpers removed in jQuery 4.
4 *
5 * Drupal 11.4 ships jQuery 4.0. Magnific Popup 1.1.0 still calls
6 * jQuery.isArray and jQuery.isFunction while opening an image, which
7 * throws and aborts the lightbox.
8 */
9(function ($) {
10  if (typeof $.isArray !== 'function') {
11    $.isArray = Array.isArray;
12  }
13
14  if (typeof $.isFunction !== 'function') {
15    $.isFunction = function (value) {
16      return typeof value === 'function';
17    };
18  }
19})(jQuery);