From 00fde325b2fe461d387dc73b5763188df5620b1f Mon Sep 17 00:00:00 2001
From: dean <dean.jones@terminus.com>
Date: Mon, 20 May 2019 07:24:44 -0400
Subject: [PATCH] fix(Navigation): clone navigation object to prevent mutation
 of original

---
 terminus-ui/navigation/src/navigation.component.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/terminus-ui/navigation/src/navigation.component.ts b/terminus-ui/navigation/src/navigation.component.ts
index 0b723aed3..dda5b926f 100644
--- a/terminus-ui/navigation/src/navigation.component.ts
+++ b/terminus-ui/navigation/src/navigation.component.ts
@@ -331,7 +331,8 @@ export class TsNavigationComponent implements OnInit, AfterViewInit {
    */
   private setUpInitialArrays(items: TsNavigationItem[]): void {
     // Clone the items and define the external flag for links only
-    const allItems = Array.from(items).map(item => {
+    const allItems = items.map(i => {
+      const item: TsNavigationItem = { ...i };
       if (isLinkItem(item)) {
         item.isExternal = this.isExternalLink(item.destination);
       }