import { QueryGroup } from './query-builder.component';
import * as i0 from "@angular/core";
export declare class QueryBuilderService {
    constructor();
    /**
     * Converts a query group to a human-readable string
     * @param query The query group to convert
     * @returns A string representation of the query
     */
    queryToString(query: QueryGroup): string;
    /**
     * Converts a query group to a JSON object that can be used in API requests
     * @param query The query group to convert
     * @returns A JSON object representation of the query
     */
    queryToJson(query: QueryGroup): any;
    /**
     * Validates a query group to ensure all rules have valid values
     * @param query The query group to validate
     * @returns True if the query is valid, false otherwise
     */
    isQueryValid(query: QueryGroup): boolean;
    /**
     * Creates an empty query group
     * @param condition The condition to use (and/or)
     * @returns An empty query group
     */
    createEmptyQuery(condition?: 'and' | 'or'): QueryGroup;
    /**
     * Creates a simple query with a single rule
     * @param field The field to filter on
     * @param operator The operator to use
     * @param value The value to filter by
     * @returns A query group with a single rule
     */
    createSimpleQuery(field: string, operator: string, value: any): QueryGroup;
    static ɵfac: i0.ɵɵFactoryDeclaration<QueryBuilderService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<QueryBuilderService>;
}