import { AsyncIterableX } from '../../asynciterable/asynciterablex';
export declare function sumProto(this: AsyncIterableX<number>, selector?: (x: number) => number | Promise<number>): Promise<number>;
export declare function sumProto<T>(this: AsyncIterableX<T>, selector: (x: T) => number | Promise<number>): Promise<number>;
declare module '../../asynciterable/asynciterablex' {
    interface AsyncIterableX<T> {
        sum: typeof sumProto;
    }
}