MenuGraftHelper.php

<?php

namespace Drupal\menu_graft;

use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\menu_link_content\MenuLinkContentInterface;

/**
 * Class MenuGraftHelper.
 *
 * @package Drupal\menu_graft
 */
class MenuGraftHelper {

  /**
   * Menu storage.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected $menuStorage;

  /**
   * Constructor.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   Entity type menuLinkManager.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->menuStorage = $entity_type_manager->getStorage('menu');
  }

  /**
   * Update menu entries from the scion menu.
   *
   * @param \Drupal\menu_link_content\MenuLinkContentInterface $menu_link_content
   *   The menu link being created or updated.
   */
  public function updateMenuGraftEntries(MenuLinkContentInterface $menu_link_content) {
    $menu = $this->menuStorage->load($menu_link_content->getMenuName());
    $has_graft = $menu->getThirdPartySetting('menu_graft', 'menu_graft_link');

    // Do we always do this, or only on grafted menus? 
    if (!$has_graft) {
      // return;
    }
    
    \Drupal::cache('menu')->invalidateAll();
    \Drupal::service('plugin.manager.menu.link')->rebuild();
  }