import { Subject, Subscriber, Subscription } from 'rxjs';
export declare class BehaviorSubject<T> extends Subject<T> {
    private valueSetted;
    private _value?;
    constructor(value?: T);
    get value(): T | undefined;
    /** @internal */
    /** @deprecated This is an internal implementation detail, do not use. */
    _subscribe(subscriber: Subscriber<T>): Subscription;
    getValue(): T | undefined;
    setValue(value: T | undefined): void;
    next(value: T): void;
}