export declare type TObservalbeUnsub = (() => void);
export declare type TObservableSet<T> = (state: T) => void;
export interface IObservable<T> {
    get: () => T;
    set: TObservableSet<T>;
    sub: (listener: TObservableSet<T>) => TObservalbeUnsub;
}
export declare const observable: <T>(state?: T) => IObservable<T>;