/**
 * 事件订阅和发布
 * @author david wang
 */
export declare class PubSub {
    private _topics;
    /**
     * 订阅
     * @param topic
     * @param handle
     */
    on(topic: string, handle: Function): void;
    /**
     * 发布
     * @param topic
     * @param args
     */
    emit(topic: string, ...args: any[]): void;
    /**
     * clear
     */
    clear(): void;
}