import { ExtremaOptions } from '../../asynciterable/extremaoptions.js';
/**
 * @ignore
 */
export declare function maxByProto<TSource, TKey>(this: AsyncIterable<TSource>, options?: ExtremaOptions<TSource, TKey>): Promise<TSource[]>;
declare module '../../asynciterable/asynciterablex' {
    interface AsyncIterableX<T> {
        maxBy: typeof maxByProto;
    }
}