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diff --git a/web/core/modules/workspaces/src/EntityTypeInfo.php b/web/core/modules/workspaces/src/EntityTypeInfo.php
new file mode 100644
index 000000000..3b91f84e5
--- /dev/null
+++ b/web/core/modules/workspaces/src/EntityTypeInfo.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace Drupal\workspaces;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Manipulates entity type information.
+ *
+ * This class contains primarily bridged hooks for compile-time or
+ * cache-clear-time hooks. Runtime hooks should be placed in EntityOperations.
+ *
+ * @internal
+ */
+class EntityTypeInfo implements ContainerInjectionInterface {
+
+  /**
+   * The entity type manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * The workspace manager service.
+   *
+   * @var \Drupal\workspaces\WorkspaceManagerInterface
+   */
+  protected $workspaceManager;
+
+  /**
+   * Constructs a new EntityTypeInfo instance.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager service.
+   * @param \Drupal\workspaces\WorkspaceManagerInterface $workspace_manager
+   *   The workspace manager service.
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, WorkspaceManagerInterface $workspace_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+    $this->workspaceManager = $workspace_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity_type.manager'),
+      $container->get('workspaces.manager')
+    );
+  }
+
+  /**
+   * Adds the "EntityWorkspaceConflict" constraint to eligible entity types.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface[] $entity_types
+   *   An associative array of all entity type definitions, keyed by the entity
+   *   type name. Passed by reference.
+   *
+   * @see hook_entity_type_build()
+   */
+  public function entityTypeBuild(array &$entity_types) {
+    foreach ($entity_types as $entity_type) {
+      if ($this->workspaceManager->isEntityTypeSupported($entity_type)) {
+        $entity_type->addConstraint('EntityWorkspaceConflict');
+      }
+    }
+  }
+
+}