import { AsyncIterableX } from './asynciterablex';
export declare class ExpandAsyncIterable<TSource> extends AsyncIterableX<TSource> {
    private _source;
    private _selector;
    constructor(source: AsyncIterable<TSource>, selector: (value: TSource) => AsyncIterable<TSource> | Promise<AsyncIterable<TSource>>);
    [Symbol.asyncIterator](): AsyncIterableIterator<TSource>;
}
export declare function expand<TSource>(source: AsyncIterable<TSource>, selector: (value: TSource) => AsyncIterable<TSource> | Promise<AsyncIterable<TSource>>): AsyncIterableX<TSource>;