/**
 * 实现消息通知逻辑
 * 解耦组件状态依赖
 */
declare type Key = string | string[];
export declare type Handler<T = any> = (data: T, key: string) => void;
export declare const observeStore: any;
export declare function publish<T>(key: Key, value?: T): void;
export declare function unsubscribe(key: Key, handler?: Handler): void;
export declare function unsubscribeAll(): void;
export declare function subscribe(key: Key, handler: Handler): {
    key: Key;
    unsubscribe: () => void;
};
export declare function subscribeOnce<T>(key: string, handler: Handler): void;
export {};