--- /dev/null
+<?php
+
+namespace Drupal\Core\Entity;
+
+/**
+ * An interface for reacting to entity bundle creation and deletion.
+ *
+ * @todo Convert to Symfony events: https://www.drupal.org/node/2332935
+ */
+interface EntityBundleListenerInterface {
+
+ /**
+ * Reacts to a bundle being created.
+ *
+ * @param string $bundle
+ * The name of the bundle created.
+ * @param string $entity_type_id
+ * The entity type to which the bundle is bound; e.g. 'node' or 'user'.
+ */
+ public function onBundleCreate($bundle, $entity_type_id);
+
+ /**
+ * Reacts to a bundle being deleted.
+ *
+ * This method runs before fields are deleted.
+ *
+ * @param string $bundle
+ * The name of the bundle being deleted.
+ * @param string $entity_type_id
+ * The entity type to which the bundle is bound; e.g. 'node' or 'user'.
+ */
+ public function onBundleDelete($bundle, $entity_type_id);
+
+}