import { IterableX } from '../iterablex';
import { MonoTypeOperatorFunction } from '../../interfaces';
export declare class DistinctUntilChangedIterable<TSource, TKey> extends IterableX<TSource> {
    private _source;
    private _keySelector;
    private _comparer;
    constructor(source: Iterable<TSource>, keySelector: (value: TSource) => TKey, comparer: (first: TKey, second: TKey) => boolean);
    [Symbol.iterator](): Generator<TSource, void, unknown>;
}
export declare function distinctUntilChanged<TSource, TKey = TSource>(keySelector?: (value: TSource) => TKey, comparer?: (first: TKey, second: TKey) => boolean): MonoTypeOperatorFunction<TSource>;