import { EventArgs, IEvent } from '@awesome-nodes/object';
import { Disposable } from "./Disposable";
import { ObjectModel } from "./ObjectModel";
import { Observable } from 'rxjs';
import { Nullable } from 'simplytyped';
export interface IPartialActionObserver<T, TEventArgs extends EventArgs = EventArgs> {
    init?: () => TEventArgs;
    next?: (value: T) => TEventArgs;
    error?: (error: Error) => void;
    complete?: () => TEventArgs;
}
/**
 * A object model utility for watching observables using command pattern style handler functions
 * which are bound to the provided {@see ActionObserver.#_thisArg} argument.
 * @template T
 */
export declare class ActionObserver<T> extends Disposable {
    #private;
    private readonly _defaultResult?;
    /**
     * Returns the observable returned from the last observed action.
     * @description Subscribe to observe the latest observed action.
     */
    get action(): Nullable<Observable<T>>;
    /**
     * Returns the last 'next' result from the last observed action.
     * @description Subscribe to receive the final 'next' result of any called action.
     */
    get actionResult(): Observable<T>;
    /**
     * Returns the last 'next' result value from the last observed action.
     * @description Bind to receive the final 'next' result value of any called action.
     */
    get actionResultValue(): T;
    /**
     * Returns a boolean value indicating weather this instance has ever received a result
     * other than the `ActionObserver._defaultResult` from an action.
     */
    get actionResultAvailable(): boolean;
    /**
     * Returns the 'next' result from the currently observed action.
     * @description Subscribe to receive the 'next' result of any called action.
     */
    get nextResult(): Observable<T>;
    /**
     * Returns the 'next' result value from the currently observed action.
     * @description Bind to receive the 'next' result value of any called action.
     */
    get nextValue(): T;
    /**
     * Returns a boolean value indicating weather this instance has ever received a result
     * other than the `ActionObserver._defaultResult` from an action.
     */
    get nextResultAvailable(): boolean;
    /**
     * Sets a command pattern style function used to observe {@link NextObserver.next} events.
     * @param {IEvent<ObjectModel>} value
     */
    set onProgress(value: IEvent<ObjectModel>);
    /**
     * Sets an error handler function used to observe {@link ErrorObserver.error} events.
     * Note: The error handler function is not bound to this instance.
     * @param {IEvent<ObjectModel>} value
     */
    set onError(value: (e: Error) => void);
    /**
     * Sets a command pattern style function used to observe {@link CompletionObserver.complete} events.
     * @param {IEvent<ObjectModel>} value
     */
    set onComplete(value: IEvent<ObjectModel>);
    /**
     *
     * @param _thisArg If provided, all observer functions are invoked on except the error observer.
     * @param _defaultResult if provided, it will be used as default value for the
     */
    constructor(_thisArg?: ObjectModel, _defaultResult?: T | undefined);
    /**
     * Observes actions by additionally using a provided next observer function or `PartialActionObserver` instance.
     * @param action
     * @param observer
     */
    observe<TSender extends ObjectModel, TEventArgs extends EventArgs>(action: () => Observable<T>, observer?: IEvent<TSender, TEventArgs> | IPartialActionObserver<T, TEventArgs>): Observable<T>;
    cancel(): void;
    reset(): void;
    /** @inheritDoc */
    equals(other: ActionObserver<T>): boolean;
    /** @inheritDoc */
    dispose(disposing?: boolean): void;
}