import { Visitor } from './media-type/cdm/visitor';
import { VisitorPreferences } from './media-type/cdm/visitor-preferences';
import { Observable } from 'rxjs';
import { AuthUserKey } from '../../media-type/doc-model/auth-user';
export declare abstract class VisitorService {
    abstract awaitVisitor$(timeoutMils?: number): Observable<Visitor>;
    abstract visitor$(): Observable<Visitor>;
    abstract getVisitorPreferences(key: AuthUserKey): Promise<VisitorPreferences>;
    abstract setVisitorPreferences(key: AuthUserKey, prefs: VisitorPreferences): Promise<void>;
    abstract updateVisitorPreferences(key: AuthUserKey, prefs: VisitorPreferences): Promise<void>;
}