Drupal 8 - Main menu twig template with adjustments for Yokai, base template was initialy classy theme

menu--main.html.twig

{#
/**
 * @file
 * Default theme implementation to display a menu.
 *
 * Available variables:
 * - menu_name: The machine name of the menu.
 * - items: A nested list of menu items. Each menu item contains:
 *   - attributes: HTML attributes for the menu item.
 *   - below: The menu item child items.
 *   - title: The menu link title.
 *   - url: The menu link url, instance of \Drupal\Core\Url
 *   - localized_options: Menu link localized options.
 *
 * @ingroup themeable
 */
#}
{% import _self as menus %}

{#
  We call a macro which calls itself to render the full tree.
  @see http://twig.sensiolabs.org/doc/tags/macro.html
#}
{{ menus.menu_links(items, attributes, 0, menu_name) }}

{% macro menu_links(items, attributes, menu_level, menu_name) %}
  {% import _self as menus %}

  {%
    set menu_classes = [
      'menu',
      'menu--' ~ menu_name,
    ]
  %}

  {% if items %}
    {% if menu_level == 0 %}
      <ul{{ attributes.addClass(menu_classes) }}>
    {% else %}
      <ul>
    {% endif %}
      {% for item in items %}

        {#
          project specific, not included in array because all top level items are expanded
          item.is_expanded ? 'menu-item--expanded',
          item.is_collapsed ? 'menu-item--collapsed',
        #}
        {%
          set classes = [
            'menu-item',
            item.in_active_trail ? 'menu-item--active-trail',
          ]
        %}
        {#
          project specific, custom rule which adds a highlighted class to the last toplevel menu item
        #}
        {% if (menu_level == 0) and (loop.last) %}
          {% set classes = classes|merge(['menu-item--highlighted']) %}
        {% endif %}
          <li{{ item.attributes.addClass(classes) }}>
            {{ link(item.title, item.url) }}
            {% if item.below %}
              {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
            {% endif %}
          </li>
      {% endfor %}
    </ul>
  {% endif %}
{% endmacro %}