import type { CrewxEventName, CrewxEventPayload, UnsubscribeFn } from './types';
export declare class TypedEventEmitter {
    private readonly _emitter;
    on<K extends CrewxEventName>(event: K, listener: (payload: CrewxEventPayload<K>) => void | Promise<void>): UnsubscribeFn;
    once<K extends CrewxEventName>(event: K, listener: (payload: CrewxEventPayload<K>) => void | Promise<void>): UnsubscribeFn;
    protected emit<K extends CrewxEventName>(event: K, payload: CrewxEventPayload<K>): void;
}