import { Observable } from 'rxjs';
import { Message } from './message';
import * as i0 from "@angular/core";
export declare class MessageService {
    private messageSource;
    messageObserver: Observable<Message>;
    add(message: Message): void;
    addAll(messages: any): void;
    clear(): void;
    static ɵfac: i0.ɵɵFactoryDef<MessageService, never>;
    static ɵprov: i0.ɵɵInjectableDef<MessageService>;
}