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