implemented new fitView logic

packages/react/src/hooks/useUpdateNodeInternals.ts

@@ -4,10 +4,49 @@ import type { UpdateNodeInternals, InternalNodeUpdate } from '@xyflow/system';
 import { useStoreApi } from '../hooks/useStore';
 
 /**
- * Hook for updating node internals.
+ * When you programmatically add or remove handles to a node or update a node's
+ * handle position, you need to let React Flow know about it using this hook. This
+ * will update the internal dimensions of the node and properly reposition handles
+ * on the canvas if necessary.
  *
  * @public
- * @returns function for updating node internals
+ * @returns Use this function to tell React Flow to update the internal state of one or more nodes
+ * that you have changed programmatically.
+ *
+ * @example
+ * ```jsx
+ *import { useCallback, useState } from 'react';
+ *import { Handle, useUpdateNodeInternals } from '@xyflow/react';
+ *
+ *export default function RandomHandleNode({ id }) {
+ *  const updateNodeInternals = useUpdateNodeInternals();
+ *  const [handleCount, setHandleCount] = useState(0);
+ *  const randomizeHandleCount = useCallback(() => {
+ *   setHandleCount(Math.floor(Math.random() * 10));
+ *    updateNodeInternals(id);
+ *  }, [id, updateNodeInternals]);
+ *
+ *  return (
+ *    <>
+ *      {Array.from({ length: handleCount }).map((_, index) => (
+ *        <Handle
+ *          key={index}
+ *          type="target"
+ *          position="left"
+ *          id={`handle-${index}`}
+ *        />
+ *      ))}
+ *
+ *      <div>
+ *        <button onClick={randomizeHandleCount}>Randomize handle count</button>
+ *        <p>There are {handleCount} handles on this node.</p>
+ *      </div>
+ *    </>
+ *  );
+ *}
+ *```
+ * @remarks This hook can only be used in a component that is a child of a
+ *{@link ReactFlowProvider} or a {@link ReactFlow} component.
  */
 export function useUpdateNodeInternals(): UpdateNodeInternals {
   const store = useStoreApi();