implemented new fitView logic

packages/react/src/hooks/useNodes.ts

@@ -6,10 +6,23 @@ import type { Node, ReactFlowState } from '../types';
 const nodesSelector = (state: ReactFlowState) => state.nodes;
 
 /**
- * Hook for getting the current nodes from the store.
+ * This hook returns an array of the current nodes. Components that use this hook
+ * will re-render **whenever any node changes**, including when a node is selected
+ * or moved.
  *
  * @public
- * @returns An array of nodes
+ * @returns An array of all nodes currently in the flow.
+ *
+ * @example
+ * ```jsx
+ *import { useNodes } from '@xyflow/react';
+ *
+ *export default function() {
+ *  const nodes = useNodes();
+ *
+ *  return <div>There are currently {nodes.length} nodes!</div>;
+ *}
+ *```
  */
 export function useNodes<NodeType extends Node = Node>(): NodeType[] {
   const nodes = useStore(nodesSelector, shallow) as NodeType[];