import { EventEmitter } from '@angular/core';
import { SortItem } from './ds-dtos.model';
import * as i0 from "@angular/core";
export declare class SortHelper {
    private fixedItems;
    private items;
    onSortItems: EventEmitter<SortItem[]>;
    get sortItems(): Array<SortItem>;
    clear(): void;
    add(sortItem: SortItem): void;
    setItem(sortItem: SortItem): void;
    setItems(sortItems: SortItem[]): void;
    /** @returns HasChanges */
    setFixedItems(sortItems: SortItem[]): boolean;
    private fixedItemsChanged;
    execute(dataSource: Array<any>): void;
    private getItemByFieldName;
    private getFixedItemByFieldName;
    private sortByMultiple;
    private compare;
    private emitSortItems;
    static ɵfac: i0.ɵɵFactoryDeclaration<SortHelper, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<SortHelper>;
}