@mui/x-tree-view/esm/internals/plugins/useTreeViewLazyLoading/useTreeViewLazyLoading.selectors.js

The community edition of the MUI X Tree View components.

import { createSelector } from '@mui/x-internals/store';
import { TREE_VIEW_ROOT_PARENT_ID } from "../useTreeViewItems/index.js";
export const lazyLoadingSelectors = {
  /**
   * Gets the data source used to lazy load items.
   */
  dataSource: createSelector(state => state.lazyLoading?.dataSource),
  /**
   * Checks whether an item is loading.
   */
  isItemLoading: createSelector((state, itemId) => state.lazyLoading?.dataSource.loading[itemId ?? TREE_VIEW_ROOT_PARENT_ID] ?? false),
  /**
   * Checks whether an item has errors.
   */
  itemHasError: createSelector((state, itemId) => !!state.lazyLoading?.dataSource.errors[itemId ?? TREE_VIEW_ROOT_PARENT_ID]),
  /**
   * Get an item error.
   */
  itemError: createSelector((state, itemId) => state.lazyLoading?.dataSource.errors[itemId ?? TREE_VIEW_ROOT_PARENT_ID])
};