import { QdFilterCategory } from '../model/filter-config.interface';
export declare const CATEGORY_TO_ITEMS_ASSIGNER = "$";
export declare const ITEM_SEPARATOR = "\u00A7";
export declare const CATEGORY_SEPARATOR = "|";
export declare const EMPTY_DATE_PLACEHOLDER = "!";
export declare const SERIALIZATION_SYMBOLS: string[];
export declare function getQueryString(categories: QdFilterCategory[], outputLegacyQueryStringFormat: boolean): string;
export declare function getFilterUrlParameter(categories: QdFilterCategory[], outputLegacyQueryStringFormat?: boolean): string;
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