import { IterableX } from '../iterablex';
import { MonoTypeOperatorFunction } from '../../interfaces';
export declare class FlattenIterable<TSource> extends IterableX<TSource> {
    private _source;
    private _depth;
    constructor(source: Iterable<TSource>, depth: number);
    private _flatten;
    [Symbol.iterator](): Iterator<TSource, any, undefined>;
}
export declare function flat<T>(depth?: number): MonoTypeOperatorFunction<T>;