export type ItemId = string | number;
export interface TreeData<TData = Any> {
    rootId: ItemId;
    items: Record<ItemId, TreeItem<TData>>;
}
export type Any = any;
export type TreeItemData = Any;
export type TreeItem<TData = Any> = {
    id: ItemId;
    children: ItemId[];
    hasChildren?: boolean;
    isExpanded?: boolean;
    isChildrenLoading?: boolean;
    data?: TData;
};
export type FlattenedTree = FlattenedItem[];
export type Path = number[];
export type FlattenedItem = {
    item: TreeItem;
    path: Path;
};
export type TreeSourcePosition = {
    parentId: ItemId;
    index: number;
};
export type TreeDestinationPosition = {
    parentId: ItemId;
    index?: number;
};