import { Observable } from 'rxjs';
/**
 * Base class for storing the onboarding item seen status. Can be overridden with own implementations
 * if you don't want to store the settings in the local storage
 */
export declare abstract class SeenSelectorsBaseService {
    /**
     * loads seen items from a persistent storage
     * @returns string array of all seen selectors
     */
    abstract load(): Observable<Array<string>>;
    /**
     * save items to a persistent storage
     */
    abstract save(seenSelectors: Array<string>): void;
}