import { MonoTypeChangeSetOperatorFunction } from '../ChangeSetOperatorFunction';
/**
 * Callback for each item as and when it is being added to the stream
 * @typeparam TObject The type of the object.
 * @typeparam TKey The type of the key.
 * @param addAction The add action.
 */
export declare function onItemAdded<TObject, TKey>(action: (value: TObject) => void): MonoTypeChangeSetOperatorFunction<TObject, TKey>;