chore(system): add polyfill for Promise.withResolvers #5210

packages/react/src/hooks/useReactFlow.ts

@@ -8,6 +8,7 @@ import {
   isRectObject,
   NodeRemoveChange,
   nodeToRect,
+  withResolvers,
   type Rect,
 } from '@xyflow/system';
 
@@ -280,7 +281,7 @@ export function useReactFlow<NodeType extends Node = Node, EdgeType extends Edge
       fitView: async (options: FitViewOptions<NodeType> | undefined) => {
         // We either create a new Promise or reuse the existing one
         // Even if fitView is called multiple times in a row, we only end up with a single Promise
-        const fitViewResolver = store.getState().fitViewResolver ?? Promise.withResolvers<boolean>();
+        const fitViewResolver = store.getState().fitViewResolver ?? withResolvers<boolean>();
 
         // We schedule a fitView by setting fitViewQueued and triggering a setNodes
         store.setState({ fitViewQueued: true, fitViewOptions: options, fitViewResolver });