import type { CuiPortalItem } from '../../types';
import { BehaviorSubject } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * Service for displaying hints/tooltips
 */
export declare class CuiTooltipService extends BehaviorSubject<readonly CuiPortalItem[]> {
    constructor();
    add(directive: CuiPortalItem): void;
    remove(directive: CuiPortalItem): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<CuiTooltipService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CuiTooltipService>;
}