export declare class BroadcastSubscription {
    #private;
    fn: (value: any) => void;
    constructor(fn: (value: any) => void, channelId: string);
    unsubscribe(): void;
}
export declare class BroadcastSubject<T> {
    #private;
    constructor();
    subscribe(fn: (value: T) => void): BroadcastSubscription;
    emit(value: T): void;
    toEventObservable(): BroadcastObservable<T>;
}
export interface BroadcastObservable<T> extends Pick<BroadcastSubject<T>, 'subscribe'> {
}