Function addNode

packages/react-stately/src/data/useTreeData.ts:259–266

(node: TreeNode<T>, map: Map<Key, TreeNode<T>>)

  }

  function addNode(node: TreeNode<T>, map: Map<Key, TreeNode<T>>) {
    map.set(node.key, node);
    if (node.children) {
      for (let child of node.children) {
        addNode(child, map);
      }
    }
  }

  function deleteNode(node: TreeNode<T>, map: Map<Key, TreeNode<T>>) {
    map.delete(node.key);