--- /dev/null
+<?php
+
+namespace Drupal\Core\Menu;
+
+/**
+ * Defines an interface for objects which overrides menu links defined in YAML.
+ */
+interface StaticMenuLinkOverridesInterface {
+
+ /**
+ * Reloads the overrides from config.
+ *
+ * Forces all overrides to be reloaded from config storage to compare the
+ * override value with the value submitted during test form submission.
+ */
+ public function reload();
+
+ /**
+ * Loads any overrides to the definition of a static (YAML-defined) link.
+ *
+ * @param string $id
+ * A menu link plugin ID.
+ *
+ * @return array|null
+ * An override with following supported keys:
+ * - parent
+ * - weight
+ * - menu_name
+ * - expanded
+ * - enabled
+ * or NULL if there is no override for the given ID.
+ */
+ public function loadOverride($id);
+
+ /**
+ * Deletes any overrides to the definition of a static (YAML-defined) link.
+ *
+ * @param string $id
+ * A menu link plugin ID.
+ */
+ public function deleteOverride($id);
+
+ /**
+ * Deletes multiple overrides to definitions of static (YAML-defined) links.
+ *
+ * @param array $ids
+ * Array of menu link plugin IDs.
+ */
+ public function deleteMultipleOverrides(array $ids);
+
+ /**
+ * Loads overrides to multiple definitions of a static (YAML-defined) link.
+ *
+ * @param array $ids
+ * Array of menu link plugin IDs.
+ *
+ * @return array
+ * One or override keys by plugin ID.
+ *
+ * @see \Drupal\Core\Menu\StaticMenuLinkOverridesInterface
+ */
+ public function loadMultipleOverrides(array $ids);
+
+ /**
+ * Saves the override.
+ *
+ * @param string $id
+ * A menu link plugin ID.
+ * @param array $definition
+ * The definition values to override. Supported keys:
+ * - menu_name
+ * - parent
+ * - weight
+ * - expanded
+ * - enabled
+ *
+ * @return array
+ * A list of properties which got saved.
+ */
+ public function saveOverride($id, array $definition);
+
+ /**
+ * The unique cache tag associated with this menu link override.
+ *
+ * @return string[]
+ * An array of cache tags.
+ */
+ public function getCacheTags();
+
+}