/**
 * 简单的 EventEmitter 实现，用于浏览器环境
 */
export default class SimpleEventEmitter {
    private events;
    on(event: string, listener: (...args: any[]) => void): void;
    off(event: string, listener: (...args: any[]) => void): void;
    emit(event: string, ...args: any[]): boolean;
    removeAllListeners(event?: string): void;
}