--- /dev/null
+<?php
+
+namespace Drupal\entity_reference;
+
+use Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem;
+
+/**
+ * Deprecated. Alternative implementation of the 'entity_reference' field type.
+ *
+ * @deprecated in Drupal 8.0.x and will be removed in Drupal 9.0.x. Use
+ * \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem instead.
+ *
+ * @see \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem
+ */
+class ConfigurableEntityReferenceItem extends EntityReferenceItem { }