export declare class EventEmitter<T extends Record<string | symbol, any[]>> {
    protected eventMap: Record<keyof T, Array<(...args: any[]) => void>>;
    on<K extends keyof T>(eventName: K, listener: (...args: T[K]) => void): this;
    once<K extends keyof T>(eventName: K, listener: (...args: T[K]) => void): this;
    emit<K extends keyof T>(eventName: K, ...args: T[K]): boolean;
    off<K extends keyof T>(eventName: K, listener?: (...args: T[K]) => void): this;
}