https://kulturservo.esperantio.net/modules/simple_recaptcha/js/buttons.js?v=1.x

1(function ($) {
2  "use strict";
3  Drupal.behaviors.simple_recaptcha_buttons = {
4    attach: function (context, drupalSettings) {
5      function recaptchaButtons(formIds) {
6        for(let formId in formIds) {
7          const $form = $('form[data-recaptcha-id="' + formId + '"]');
8          // Count submit buttons inside of form
9          // if there's only 1 submit we're good to go.
10          let count = $form.find('input[type="submit"]').length;
11          if(count === 1) {
12            $form.find('[type="submit"]').addClass('simple-recaptcha-submit');
13            continue;
14          }
15
16          // Lookup for FAPI primary button ( '#button_type' => 'primary' )
17          // @see https://www.drupal.org/node/1848288
18          const $primary = $form.find('.button--primary');
19          if($primary.length > 0) {
20            $form.find('.button--primary').addClass('simple-recaptcha-submit');
21            continue;
22          }
23
24          // Fallback - last available submit element.
25          $form.find('[type="submit"]').last().addClass('simple-recaptcha-submit');
26
27        }
28      }
29      if (typeof drupalSettings.simple_recaptcha !== 'undefined') {
30        recaptchaButtons(drupalSettings.simple_recaptcha.form_ids);
31      }
32
33      if (typeof drupalSettings.simple_recaptcha_v3 !== 'undefined') {
34        recaptchaButtons(drupalSettings.simple_recaptcha_v3.forms);
35      }
36
37    }
38  }
39})(jQuery);