import { Enumerable } from "./Enumerable";
import { GroupedEnumerable } from "./GroupedEnumerable";
export declare class GroupByEnumerable<K, T> extends Enumerable<GroupedEnumerable<K, T>> {
    readonly parent: Enumerable<T>;
    readonly keySelector: (item: T) => K;
    enableCache: boolean;
    constructor(parent: Enumerable<T>, keySelector: (item: T) => K);
    [Symbol.iterator](): IterableIterator<GroupedEnumerable<K, T>>;
    protected generator(): IterableIterator<GroupedEnumerable<K, T>>;
    addValue(key: K, value: T): void;
}