export declare class EventEmitter<T extends {
    [x: string]: (...args: any[]) => void;
}> {
    #private;
    once: (key: keyof T, value: T[keyof T]) => void;
    emit: (key: keyof T, ...args: Parameters<T[keyof T]>) => void;
    on: (key: keyof T, value?: T[keyof T] | undefined) => void;
    off: (key: keyof T) => void;
    delete: (key: keyof T) => void;
}