import { Stream } from '@motorcycle/types';
/**
 * Activates a stream, calling a function `f` with each event value, and returns
 * a Promise of completion.
 *
 * @name observe<A>(f: (value: A) => any, stream: Stream<A>): Promise<void>
 */
export declare const observe: Observe;
export interface Observe {
    <A>(f: (value: A) => any, stream: Stream<A>): Promise<void>;
    <A>(f: (value: A) => any): (stream: Stream<A>) => Promise<void>;
}