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