From 6093be92e9ca5d52eb42727db5c122f8cab6ab28 Mon Sep 17 00:00:00 2001
From: kiasyn <kiasyn@users.noreply.github.com>
Date: Thu, 30 Jan 2025 15:31:03 +1300
Subject: [PATCH] Fix reference to TouchEvent which is not defined in Firefox

---
 packages/uui-base/lib/utils/drag.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/uui-base/lib/utils/drag.ts b/packages/uui-base/lib/utils/drag.ts
index 7aa938ee0..6b841b122 100644
--- a/packages/uui-base/lib/utils/drag.ts
+++ b/packages/uui-base/lib/utils/drag.ts
@@ -22,11 +22,15 @@ export const drag = (
     const offsetY = dims.top + defaultView.scrollY;
 
     let pointerEvent: PointerEvent | Touch;
-    if (event instanceof TouchEvent) {
+    // TouchEvent is not available in Firefox
+    if ('TouchEvent' in window && event instanceof TouchEvent) {
       pointerEvent = event.touches[0];
-    } else {
+    } else if ( event instanceof PointerEvent ) {
       pointerEvent = event;
     }
+    else {
+      return;
+    }
 
     const x = pointerEvent.pageX - offsetX;
     const y = pointerEvent.pageY - offsetY;