import { Dissconnect, RefValue } from './interface';
export default class Stateful<T> {
    protected value: RefValue<T>;
    constructor(value: RefValue<T>);
    private listeners;
    private emit;
    protected update(value: RefValue<T>): void;
    snapshot(): RefValue<T>;
    subscribe(callback: (value: RefValue<T>) => void): Dissconnect;
}