import { Subject, Observable, Subscription, OperatorFunction } from 'rxjs';
import { ObserverOrNext } from '@craftercms/utils';
import { Message, MessageScope, MessageTopic } from '@craftercms/models';
export declare abstract class Messenger {
    protected multiCaster$: Subject<Message>;
    protected messages$: Observable<Message>;
    protected targets: Array<any>;
    protected origins: Array<any>;
    constructor();
    subscribe(observerOrNext: ObserverOrNext<Message>): Subscription;
    subscribe<T extends Message, R>(observerOrNext: ObserverOrNext<R>, ...operators: OperatorFunction<T, R>[]): Subscription;
    subscribeTo<T, R>(topic: MessageTopic, subscriber: (value: Message) => void, scope?: MessageScope, ...operations: any[]): Subscription;
    addTarget(target: any): void;
    resetTargets(): void;
    removeTarget(target: Window): void;
    addOrigin(origin: string): void;
    resetOrigins(): void;
    removeOrigin(origin: string): void;
    publish(message: Message): void;
    publish(topic: MessageTopic, data: any, scope: MessageScope): void;
    sendMessage(message: Message, targetOrigin?: string): void;
    originAllowed(origin: string): boolean;
}