import { IterableX } from '../../iterable/iterablex';
import { PartialObserver } from '../../observer';
/**
 * @ignore
 */
export declare function tapProto<T>(this: IterableX<T>, observer: PartialObserver<T>): IterableX<T>;
declare module '../../iterable/iterablex' {
    interface IterableX<T> {
        tap: typeof tapProto;
    }
}