import { Observable } from 'rxjs';
/** Global service used throughout the application to communicate
 * to the loading indicator component when it should show and hide
 * its loading indicator */
export declare class LoadingIndicatorService {
    private loading;
    private loadingMessage;
    /** Notifies the loading indicator component to show a
     * loading indicator with the specified text */
    showLoadingIndicator(loadingMessage?: string): void;
    /** Notifies the loading indicator component to hide the
     * currently displayed loading indicator */
    hideLoadingIndicator(): void;
    get loadStarted(): Observable<string>;
    get loadEnded(): Observable<void>;
}