/**
 * @module Collection
 */
import { type ICollection, type Map } from "../../../../collection/contracts/_module.js";
/**
 * @internal
 */
export declare class UniqueIterable<TInput, TOutput> implements Iterable<TInput> {
    private collection;
    private callback;
    constructor(collection: ICollection<TInput>, callback?: Map<TInput, ICollection<TInput>, TOutput>);
    [Symbol.iterator](): Iterator<TInput>;
}