import * as i0 from "@angular/core";
export declare class BreadcrumbService {
    private readonly _titleAdditionalInfo$;
    readonly titleAdditionalInfo$: import("rxjs").Observable<string | null>;
    setTitleAdditionalInfo(value: string | null): void;
    clearTitleAdditionalInfo(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<BreadcrumbService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<BreadcrumbService>;
}