export declare type SubscribeCallback = () => void;
export declare type SubscribeCallbackCache = Map<string, SubscribeCallback[]>;
export declare const unsubscribeCallback: (key: string, cb: SubscribeCallback, cbCache: SubscribeCallbackCache) => void;
export declare const subscribeCallback: (key: string, cb: SubscribeCallback, cbCache: SubscribeCallbackCache) => () => void;