import { Notification, NotificationOptions, NotificationRef } from '../models';
import * as i0 from "@angular/core";
export declare class NotificationQueueService {
    private readonly queue$$;
    private readonly onRemove$$;
    readonly current$: import("rxjs").Observable<NotificationRef & {
        id: string | number;
    }>;
    readonly queue$: import("rxjs").Observable<(NotificationRef & {
        id: string | number;
    })[]>;
    readonly onRemove$: import("rxjs").Observable<NotificationRef>;
    add(notification: Notification, options: NotificationOptions): NotificationRef;
    remove(notificationRef: NotificationRef): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<NotificationQueueService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NotificationQueueService>;
}
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