fix: window check for Electron (floating-ui#1593)

Author: atomiks

packages/dom/src/utils/getNodeScroll.ts

@@ -1,16 +1,16 @@
 import {NodeScroll} from '../types';
-import {isWindow} from './window';
+import {isElement} from './is';
 
 export function getNodeScroll(element: Element | Window): NodeScroll {
-  if (isWindow(element)) {
+  if (isElement(element)) {
     return {
-      scrollLeft: element.pageXOffset,
-      scrollTop: element.pageYOffset,
+      scrollLeft: element.scrollLeft,
+      scrollTop: element.scrollTop,
     };
   }
 
   return {
-    scrollLeft: element.scrollLeft,
-    scrollTop: element.scrollTop,
+    scrollLeft: element.pageXOffset,
+    scrollTop: element.pageYOffset,
   };
 }

packages/dom/src/utils/window.ts

@@ -1,5 +1,11 @@
 export function isWindow(value: any): value is Window {
-  return value?.toString() === '[object Window]';
+  return (
+    value &&
+    value.document &&
+    value.location &&
+    value.alert &&
+    value.setInterval
+  );
 }
 
 export function getWindow(node: Node | Window): Window {