type Event = string | number | symbol;
type Handler<T = unknown> = (ev: Event, payload: T) => void;
declare class EventBus<T extends Event> {
    private eventsMap;
    pub<P = undefined>(ev: T, payload?: P): void;
    sub<P = unknown>(ev: T, subscribe: Handler<P>): () => void;
}
/**
 * 继承自 EventBus 的有状态事件总线
 * @template S 状态类型
 * @template E 事件类型
 */
export declare class StatefulEventBus<S extends Record<string, any>, E extends Event = keyof S | symbol> extends EventBus<E | keyof S | symbol> {
    /**
     * 内部状态
     */
    state: S;
    /**
     * 构造函数
     * @param initialState 初始状态
     */
    constructor(initialState: S);
    /**
     * 获取当前状态
     * @returns 当前状态的副本
     */
    getState(): S;
    getStateIn<K extends keyof S>(p: K): S[K];
    setStateIn(p: keyof S, v: any): void;
    setStateBatch(s: Partial<S>): void;
    notify(p: E): void;
}
export {};