import { Duration, Time, Listener } from "./@types";
export type Descriptor = Subscription<any>;
export declare class Subscription<T> {
    private _listener;
    private _duration;
    private _start;
    constructor(_listener: Listener<T>, _duration: Duration, _start: Time);
    Extend(duration: Duration): void;
    Cancel(): void;
    Execute(data: T): void;
    get Alive(): boolean;
}