import { Enumerable } from './enumerable';
import { IComparer } from './comparer';
export declare class OrderedEnumerable<TElement> extends Enumerable<TElement> {
    [Symbol.iterator](): IterableIterator<TElement>;
    thenBy<TKey>(keySelector: (item: TElement) => TKey, comparer?: IComparer<TKey>): OrderedEnumerable<TElement>;
    thenByDescending<TKey>(keySelector: (item: TElement) => TKey, comparer?: IComparer<TKey>): OrderedEnumerable<TElement>;
    toString(): string;
}