import { Observable } from 'rxjs';
export interface Service extends ServiceLike {
    readonly changes$: Observable<void>;
    readonly effects$: Observable<void>;
}
export interface ServiceLike {
    readonly changes$?: Observable<any>;
    readonly effects$?: Observable<any>;
}
export declare const NULL_SERVICE: Service;
export declare function createService(...services: ServiceLike[]): BaseService;
export declare class BaseService implements Service {
    constructor(...dependencies: ServiceLike[]);
    readonly changes$: Observable<void>;
    readonly effects$: Observable<void>;
}
export declare function isService(maybeService: any): maybeService is Service;