import { AsyncIterableX } from '../asynciterablex';
import { MonoTypeOperatorAsyncFunction } from '../../interfaces';
export declare class DefaultIfEmptyAsyncIterable<TSource> extends AsyncIterableX<TSource> {
    private _source;
    private _defaultValue;
    constructor(source: AsyncIterable<TSource>, defaultValue: TSource);
    [Symbol.asyncIterator](): AsyncGenerator<TSource, void, unknown>;
}
export declare function defaultIfEmpty<T>(defaultValue: T): MonoTypeOperatorAsyncFunction<T>;