import { DataEntity } from '../data-entity';
import DataStore from '../data-store';
declare function mergeIntoExisting<TClient extends DataEntity>(dataStore: DataStore<TClient>, item: TClient): {
    current: TClient;
    diff: TClient;
} | {
    current: TClient;
    diff?: undefined;
};
export declare const mergeMapper: {
    mergeIntoExisting: typeof mergeIntoExisting;
};
export {};
