fix: 1

src/utils/event.ts

@@ -1,7 +1,7 @@
 
 
 export const getOffset = (ev: MouseEvent | TouchEvent, dom = ev.target! as HTMLElement, ndx = 0) => {
-	const event = ev instanceof TouchEvent ? ev.changedTouches[ndx] : ev
+	const event = (window.TouchEvent && ev instanceof TouchEvent) ? ev.changedTouches[ndx] : ev
 	const rect = dom.getBoundingClientRect();
 	const offsetX = event.clientX - rect.left;
 	const offsetY = event.clientY - rect.top;