import { IPepSmartFilterOperatorUnit } from '@pepperi-addons/ngx-lib/smart-filters';
/**
 * gets a smart filter operation unit item
 * @param operationUnit legacy operation unit
 * @returns smart filter operation unit item
 */
export declare function getSmartFilterOperationUnit(operationUnit: string): IPepSmartFilterOperatorUnit | null;
/**
 * gets a legacy operation unit value
 * @param operationUnit smart filter operation unit item
 * @returns legacy operation unit value
 */
export declare function getLegacyOperationUnit(operationUnit: IPepSmartFilterOperatorUnit): string | null;