export declare const eventsType: {
    BEFORE_CHANGE: string;
    AFTER_CHANGE: string;
};
declare class EventBus {
    events: {
        [eventName: string]: Set<Function>;
    };
    subscribe(eventName: string, cb: Function): void;
    unsubscribe(eventName: string, cb: Function): void;
    emit(eventName: string, ...args: any): void;
}
declare const _default: EventBus;
export default _default;