import { EntityConstructor } from "./base";
export declare const EXTENDS_DEFINE = "ambjs::extends_define";
export declare function defineExtends(target: EntityConstructor<any>, metadata: IExtendsContract): void;
export declare function resolveExtends(target: EntityConstructor<any>, defaults?: Partial<IExtendsContract>): IExtendsContract;
export interface IExtendsContract {
    type: string | null;
    parent: EntityConstructor<any> | null;
}
export declare function Extends(parent: EntityConstructor<any>): ClassDecorator;