import { Model } from './observe';
import { ChangeMarker } from './change-marker';
export declare function isModel(value: any): value is Model;
export declare function getObserver<T extends object>(v: T): T & Model | null;
export declare function getChangeMarker<T extends object>(target: T): ChangeMarker | null;
export declare function attachModel(parentModel: Model, subModel: unknown): void;
export declare function detachModel(...models: any[]): void;