import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class PreloaderService {
    private preloaderMsgs;
    private preloaderMsgs$;
    /**
     * Activates the preloader overlay ("<spaas-preloader>" to be added to your app.component.html).
     *
     * @param preloaderMsg will be added to the list of messages, to be shown as feedback to the user.
     */
    start(preloaderMsg: string): void;
    /**
     * Removes the "preloaderMsg" from the list of preloader messages.
     *
     * @param preloaderMsg message to be removed from the list. If the "preloaderMsg" was the last one on the list,
     * the preloader overlay will be hidden.
     */
    stop(preloaderMsg: string): void;
    private newPreloaderMsg;
    onNewPreloaderMsg(): Observable<string[]>;
    getPreloaderMsgs(): string[];
    static ɵfac: i0.ɵɵFactoryDeclaration<PreloaderService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<PreloaderService>;
}