export declare class EventEmitter {
    private readonly eventListeners;
    constructor();
    on(evt: any, listener: any): any;
    once(evt: any, listener: any): void;
    protected emit(evt: any, e?: any): void;
    protected off(evt: any, listener: any): void;
    protected addHandler(event: string, originHandler: any, getArguments: any): void;
}