import { BaseWidget } from '../base-widget';
import { NgAisInstantSearch, FacetSortByStringOptions } from '../instantsearch/instantsearch';
import { NgAisIndex } from '../index-widget/index-widget';
export declare type HierarchicalMenuState = {
    createURL: (value: string) => string;
    items: HierarchicalMenuItem[];
    refine: (value: string) => void;
};
export declare type HierarchicalMenuItem = {
    value: string;
    label: string;
    count: number;
    isRefined: boolean;
    data: HierarchicalMenuItem[] | null;
};
export declare class NgAisHierarchicalMenu extends BaseWidget {
    parentIndex: NgAisIndex;
    instantSearchInstance: NgAisInstantSearch;
    attributes: string[];
    separator?: string;
    rootPath?: string;
    showParentLevel?: boolean;
    limit?: number | string;
    sortBy?: FacetSortByStringOptions[] | ((a: HierarchicalMenuItem, b: HierarchicalMenuItem) => number);
    transformItems?: <U extends HierarchicalMenuItem>(items: HierarchicalMenuItem[]) => U[];
    state: HierarchicalMenuState;
    get isHidden(): boolean;
    constructor(parentIndex: NgAisIndex, instantSearchInstance: NgAisInstantSearch);
    ngOnInit(): void;
}