import { UndoEngine } from '@devexpress/analytics-core/analytics-utils';
import * as ko from 'knockout';
export declare class CustomMergingEngine {
    private _customMergeForFormatString;
    customMerge(propertyName: string, controls: {}[], undoEngine: ko.Observable<UndoEngine>): {
        result: ko.ObservableArray<any>;
        subscriptions: any[];
    };
}