(function($, Drupal, drupalSettings, window, document) {
  Drupal.behaviors.worldmap = {
    attach(context, settings) {
      console.log('behaviors called');
      $('#map-container', context).once('addmap').each( () => {
        let map = new InteractiveMap('.interactive-map', (country) => {
          let id = settings.worldmap.yearsnids[country];
          if(!id) {
            id = 0;
          }
          console.log('id');
          let ajax_settings = {
            url: '/my_custom_module/ajax/expand/' +
                  settings.worldmap.ctype + "-infobox/" + id,
          };
          Drupal.ajax(ajax_settings).execute();
        });
        map.init();
      });
...

<a href="/my_custom_module/ajax/expand/{{ fields.field_content_type.content|render|striptags|trim }}/{{ fields.nid.content|render|striptags|trim }}" class="button use-ajax">See the project</a>