export default class Hierarchy {
    constructor(items: any);
    noParentId: number;
    clear(): void;
    _items: {} | undefined;
    _itemsByParent: {} | undefined;
    _toParentId(parentId: any): any;
    _addItem(item: any): void;
    add(items: any): void;
    get(id: any): any;
    eachByParent(parentId: any, onItem: any): void;
    mapByParent(parentId: any, onItem: any): any;
}