import { Subscription } from 'rxjs';
import { Constructor } from '@cratis/fundamentals';
export type MessageHandler<T> = (message: T) => void;
export declare abstract class IMessenger {
    abstract publish<TMessage extends object>(message: TMessage): void;
    abstract subscribe<TMessage extends object>(type: Constructor<TMessage>, callback: MessageHandler<TMessage>): Subscription;
}
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