import { IterableX } from '../iterablex';
import { MonoTypeOperatorFunction } from '../../interfaces';
export declare class ExpandIterable<TSource> extends IterableX<TSource> {
    private _source;
    private _fn;
    constructor(source: Iterable<TSource>, fn: (value: TSource) => Iterable<TSource>);
    [Symbol.iterator](): Generator<TSource, void, unknown>;
}
export declare function expand<TSource>(selector: (value: TSource) => Iterable<TSource>): MonoTypeOperatorFunction<TSource>;