import { AbstractStateful } from "../../core/stateful/abstract.stateful";
export type StatefulSubscriber<T> = (value: T) => void;
export type StatefulSetter<T> = (value: T) => T;
export declare class Stateful<T> implements AbstractStateful<T> {
    private _value;
    private _subscribers;
    private _version;
    constructor(_value: T);
    Get(): T;
    If<U>(predicate: (value: T) => boolean, then: (value: T) => U, otherwise: (value: T) => U, factory?: (value: U) => Stateful<U>): Stateful<U>;
    DirectSet(value: T): void;
    Set(fabric: StatefulSetter<T>): void;
    Subscribe(subscriber: StatefulSubscriber<T>): () => void;
    Notify(): void;
    Dispose(): void;
    get Value(): T;
    get Version(): number;
}