Issue #3364372 by tonytheferg: Ajax error after update commerce cart

commerce_ajax_atc.services.yml

 services:
   ajax_cart_event_subscriber:
     class: \Drupal\commerce_ajax_atc\EventSubscriber\AjaxCartEventSubscriber
-    arguments:
-      - '@messenger'
-      - '@string_translation'
-      - '@request_stack'
+    arguments: ['@messenger', '@string_translation', '@entity_type.manager', '@request_stack']
     tags:
       - { name: event_subscriber }

composer.json

@@ -5,7 +5,7 @@
     "homepage": "http://drupal.org/project/commerce_ajax_atc",
     "license": "GPL-2.0+",
     "require": {
-        "drupal/commerce": "^2.28"
+        "drupal/commerce": "^2.36"
     },
     "require-dev": {
         "drupal/colorbox_load": "^1.2",

src/EventSubscriber/AjaxCartEventSubscriber.php

@@ -4,6 +4,7 @@ namespace Drupal\commerce_ajax_atc\EventSubscriber;
 
 use Drupal\commerce_cart\Event\CartEntityAddEvent;
 use Drupal\commerce_cart\EventSubscriber\CartEventSubscriber as CommerceCartEventSubscriber;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Messenger\MessengerInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Symfony\Component\HttpFoundation\RequestStack;
@@ -20,6 +21,13 @@ class AjaxCartEventSubscriber extends CommerceCartEventSubscriber {
    */
   protected $currentRequest;
 
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
   /**
    * Constructs a new CartEventSubscriber object.
    *
@@ -27,11 +35,13 @@ class AjaxCartEventSubscriber extends CommerceCartEventSubscriber {
    *   The messenger.
    * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
    *   The string translation.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
    * @param Symfony\Component\HttpFoundation\RequestStack $request_stack
    *   The request stack.
    */
-  public function __construct(MessengerInterface $messenger, TranslationInterface $string_translation, RequestStack $request_stack) {
-    parent::__construct($messenger, $string_translation);
+  public function __construct(MessengerInterface $messenger, TranslationInterface $string_translation, EntityTypeManagerInterface $entity_type_manager, RequestStack $request_stack,) {
+    parent::__construct($messenger, $string_translation, $entity_type_manager);
 
     $this->currentRequest = $request_stack->getCurrentRequest();
   }