import { AsyncSubscription } from './Subscription';
declare class AsyncEventEmitter<T> {
    private readonly listeners;
    emit(value: T): void;
    subscribe(next: (value: T) => Promise<void>, error?: (err: Error) => void, complete?: () => void): AsyncSubscription;
    subscribeOnce(next: (value: T) => Promise<void>, error?: (err: Error) => void, complete?: () => void): void;
    unsubscribe(listener: (value: T) => Promise<void>): void;
}
export { AsyncEventEmitter };