Интерфейс IVirtualTreeState<N, T, K>

interface IVirtualTreeState<
    N extends VirtualTreeNodeModel<T, K>,
    T,
    K extends NodeKeyType = NodeKeyType,
> {
    childrenLoadedKeys: Set<K | null>;
    disabledCascadeNodes: Set<K>;
    disabledNodes: Set<K>;
    filteredExpandedKeys: Set<K>;
    filterFn?: (item: VirtualItem<N>) => boolean;
    firstRenderIndex: number;
    itemKeys: K[];
    itemsExpandedKeys: Set<K>;
    itemsMap: Map<K, VirtualItem<N>>;
    nodeChildren: Map<K | null, K[]>;
    nodeParents: Map<K, K | null>;
    nodesToDelete: Set<K>;
    nodesToDeleteCascade: Set<K>;
    partiallyLoadedKeys: Map<K | null, number>;
    scrollPosition: number;
}