import { PartialObserver } from './types';
import { Observable } from './Observable';
/**
 * Represents a push-based event or value that an {@link Observable} can emit.
 * This class is particularly useful for operators that manage notifications,
 * like {@link materialize}, {@link dematerialize}, {@link observeOn}, and
 * others. Besides wrapping the actual delivered value, it also annotates it
 * with metadata of, for instance, what type of push message it is (`next`,
 * `error`, or `complete`).
 *
 * @see {@link materialize}
 * @see {@link dematerialize}
 * @see {@link observeOn}
 *
 * @class Notification<T>
 */
export declare class Notification<T> {
    kind: string;
    value?: T;
    error?: any;
    hasValue: boolean;
    constructor(kind: string, value?: T, error?: any);
    /**
     * Delivers to the given `observer` the value wrapped by this Notification.
     * @param {Observer} observer
     * @return
     */
    observe(observer: PartialObserver<T>): any;
    /**
     * Given some {@link Observer} callbacks, deliver the value represented by the
     * current Notification to the correctly corresponding callback.
     * @param {function(value: T): void} next An Observer `next` callback.
     * @param {function(err: any): void} [error] An Observer `error` callback.
     * @param {function(): void} [complete] An Observer `complete` callback.
     * @return {any}
     */
    do(next: (value: T) => void, error?: (err: any) => void, complete?: () => void): any;
    /**
     * Takes an Observer or its individual callback functions, and calls `observe`
     * or `do` methods accordingly.
     * @param {Observer|function(value: T): void} nextOrObserver An Observer or
     * the `next` callback.
     * @param {function(err: any): void} [error] An Observer `error` callback.
     * @param {function(): void} [complete] An Observer `complete` callback.
     * @return {any}
     */
    accept(nextOrObserver: PartialObserver<T> | ((value: T) => void), error?: (err: any) => void, complete?: () => void): any;
    /**
     * Returns a simple Observable that just delivers the notification represented
     * by this Notification instance.
     * @return {any}
     */
    toObservable(): Observable<T>;
    private static completeNotification;
    private static undefinedValueNotification;
    /**
     * A shortcut to create a Notification instance of the type `next` from a
     * given value.
     * @param {T} value The `next` value.
     * @return {Notification<T>} The "next" Notification representing the
     * argument.
     * @nocollapse
     */
    static createNext<T>(value: T): Notification<T>;
    /**
     * A shortcut to create a Notification instance of the type `error` from a
     * given error.
     * @param {any} [err] The `error` error.
     * @return {Notification<T>} The "error" Notification representing the
     * argument.
     * @nocollapse
     */
    static createError<T>(err?: any): Notification<T>;
    /**
     * A shortcut to create a Notification instance of the type `complete`.
     * @return {Notification<any>} The valueless "complete" Notification.
     * @nocollapse
     */
    static createComplete(): Notification<any>;
}