Added style class definitions to *Style.d.ts

components/lib/menu/style/MenuStyle.d.ts

@@ -1,3 +1,26 @@
+/**
+ *
+ * Menu is a navigation / command component that supports dynamic and static positioning.
+ *
+ * [Live Demo](https://www.primevue.org/menu/)
+ *
+ * @module menustyle
+ *
+ */
 import { BaseStyle } from '../../base/style';
 
+export enum MenuClasses {
+    root = 'p-menu',
+    start = 'p-menu-start',
+    list = 'p-menu-list',
+    submenuItem = 'p-menu-submenu-item',
+    separator = 'p-menu-separator',
+    end = 'p-menu-end',
+    item = 'p-menu-item',
+    itemContent = 'p-menu-item-content',
+    itemLink = 'p-menu-item-link',
+    itemIcon = 'p-menu-item-icon',
+    itemLabel = 'p-menu-item-label'
+}
+
 export interface MenuStyle extends BaseStyle {}