[+] Encapsulate method to update index

src/components/navigation/navigation.ts

@@ -58,6 +58,16 @@ export default class Navigation extends Vue
         window.history.pushState({lastTab: index}, '', url);
     }
 
+    /**
+     * Update index
+     *
+     * @param newIndex New index
+     */
+    private updateIndex(newIndex: string)
+    {
+        this.$emit('update:activeIndex', newIndex);
+    }
+
     /**
      * This function is called when the sign out button is clicked.
      */