import { IObservable } from '../internal/Observable';
import { CompositeObserver, IObserver } from '../internal/Observer';
import { ISubscription } from '../internal/Subscription';
import { IScheduler } from '../schedulers/Scheduler';
export declare class Subject<T> extends CompositeObserver<T> implements IObservable<T> {
    subscribe(observer: IObserver<T>, scheduler: IScheduler): ISubscription;
}
export declare const subject: <T>() => Subject<T>;