import { TuiPortal } from '@taiga-ui/cdk/portals';
import { TuiPopupService } from '@taiga-ui/core/portals/popup';
import { type PolymorpheusComponent } from '@taiga-ui/polymorpheus';
import * as i0 from "@angular/core";
export declare abstract class TuiAlertService<T, K = void> extends TuiPortal<T, K> {
    private readonly concurrency;
    private readonly current;
    private readonly queue;
    constructor(concurrency: number, service?: TuiPopupService);
    protected add(component: PolymorpheusComponent<unknown>): () => void;
    static ɵfac: i0.ɵɵFactoryDeclaration<TuiAlertService<any, any>, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TuiAlertService<any, any>>;
}