export declare type Listener = (...args: any[]) => void;
export declare class EventEmitter {
    /**
     * @ignore - do not document.
     */
    maxListeners: number;
    /**
     * @ignore - do not document.
     */
    warnOnce: boolean;
    /**
     * @ignore - do not document.
     */
    events: {
        [key: string]: Listener[];
    };
    /**
     * @ignore - do not document.
     */
    on(eventName: string, listener: Listener): void;
    /**
     * @ignore - do not document.
     */
    removeListener(eventName: string, listener: Listener): void;
    /**
     * @ignore - do not document.
     */
    removeAllListeners(eventName?: string): void;
    /**
     * @ignore - do not document.
     */
    emit(eventName: string, ...args: any[]): void;
    /**
     * @ignore - do not document.
     */
    once(eventName: string, listener: Listener): void;
}