import { TreeTableItemShell } from './models';
import { SortFunction } from '../models';
export declare class SortHelper<T> {
    private static otherShells;
    private static shells;
    private static sortFunction;
    static getSorted<T>(shells: TreeTableItemShell<T>[], sortFunction: SortFunction<T>): TreeTableItemShell<any>[];
    private static getShellsForLevel;
    private static selectLevelShells;
    static sortShells<T>(shells: TreeTableItemShell<T>[], sortFunction: SortFunction<T>): TreeTableItemShell<T>[];
}