import { Observable } from 'rxjs';
import { Notification } from '../models/notification.model';
import * as i0 from "@angular/core";
/**
 * Centralized service to manage in-app notifications.
 * Components can subscribe to `notifications$` to display messages.
 */
export declare class NotificationService {
    private notificationSubject;
    /** Stream of notifications to display */
    readonly notifications$: Observable<Notification>;
    /** Emit a success notification */
    showSuccess(message: string, duration?: number): void;
    /** Emit an error notification */
    showError(message: string, duration?: number): void;
    /** Emit an info notification */
    showInfo(message: string, duration?: number): void;
    /** Emit a warning notification */
    showWarning(message: string, duration?: number): void;
    /** Internal helper to push a notification into the stream */
    private notify;
    static ɵfac: i0.ɵɵFactoryDeclaration<NotificationService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NotificationService>;
}