import { EntityMetadata } from '.';
declare const dataEntityPropertyKey: unique symbol;
export interface WithDataEntity<D> {
    [dataEntityPropertyKey]: D;
}
export declare const dataEntityForGraphQLEntity: <G, D>(entity: G & WithDataEntity<D>) => D | undefined;
export declare const fromBackendEntity: <G = unknown, D = unknown>(entityOrMetadata: EntityMetadata<G, D> | (new (...args: any[]) => G), dataEntity: D) => (G & ({} | undefined)) | null;
export {};