Added style class definitions to *Style.d.ts

components/lib/tabmenu/style/TabMenuStyle.d.ts

@@ -1,3 +1,22 @@
+/**
+ *
+ * TabMenu is a navigation component that displays items as tab headers. Example below uses nested routes with TabMenu.
+ *
+ * [Live Demo](https://www.primevue.org/tabmenu/)
+ *
+ * @module tabmenustyle
+ *
+ */
 import { BaseStyle } from '../../base/style';
 
+export enum TabMenuClasses {
+    root = 'p-tabmenu',
+    tablist = 'p-tabmenu-tablist',
+    item = 'p-tabmenu-item',
+    itemLink = 'p-tabmenu-item-link',
+    itemIcon = 'p-tabmenu-item-icon',
+    itemLabel = 'p-tabmenu-item-label',
+    inkbar = 'p-tabmenu-ink-bar'
+}
+
 export interface TabMenuStyle extends BaseStyle {}