type Event = string;
type Listener = (...args: any[]) => void | Promise<void>;
/**
 * A simple EventEmitter shim that provides only the basics
 */
export declare class EventEmitter {
    private readonly events;
    emit(event: Event, ...args: any[]): boolean;
    on(event: Event, listener: Listener): EventEmitter;
    off(event: Event, listener: Listener): EventEmitter;
    once(event: Event, listener: Listener): EventEmitter;
}
export {};