import { Observable } from 'rxjs';
import { NotificationPreference } from '../../../model/notification-preference.model';
export declare abstract class UserNotificationPreferenceAdapter {
    /**
     * Abstract method used to load notification preferences for an user.
     *
     * @param userId The `userId` for given user
     */
    abstract loadAll(userId: string): Observable<NotificationPreference[]>;
    /**
     * Abstract method used to update notification preferences for an user.
     *
     * @param userId The `userId` for given user
     * @param preferences The notification preferences to be updated.
     */
    abstract update(userId: string, preferences: NotificationPreference[]): Observable<{}>;
}