import { BaseWidget } from '../base-widget';
import { NgAisInstantSearch } from '../instantsearch/instantsearch';
import { NgAisIndex } from '../index-widget/index-widget';
export declare type SortByItem = {
    value: string;
    label: string;
};
export declare type SortByState = {
    currentRefinement: string | null;
    options: SortByItem[];
    refine: Function;
};
export declare class NgAisSortBy extends BaseWidget {
    parentIndex: NgAisIndex;
    instantSearchInstance: NgAisInstantSearch;
    items: SortByItem[];
    transformItems?: <U extends SortByItem>(items: SortByItem[]) => U[];
    state: SortByState;
    constructor(parentIndex: NgAisIndex, instantSearchInstance: NgAisInstantSearch);
    ngOnInit(): void;
}