export declare type Subscriber<T> = (value: T) => void;
export declare type Unsubscribe = () => void;
export declare function createSubscribableState<T>(initialState: T): {
    getState: () => T;
    setState: (newState: T) => void;
    subscribe: (subscriber: Subscriber<T>, sendImmediate?: boolean | undefined) => () => boolean;
};