import { MonoTypeChangeSetOperatorFunction } from '../ChangeSetOperatorFunction';
/**
 * Callback when an item has been updated eg. (current, previous)=>{}
 * @typeparam TObject The type of the object.
 * @typeparam TKey The type of the key.
 * @param action The update action.
 */
export declare function onItemUpdated<TObject, TKey>(action: (current: TObject, previous: TObject) => void): MonoTypeChangeSetOperatorFunction<TObject, TKey>;