import { Signal, WritableSignal } from '@angular/core';
import { FormGroup } from '@angular/forms';
import * as i0 from "@angular/core";
interface IRuleTreeState {
    $formValue: WritableSignal<any>;
    $filterFormJsonString: WritableSignal<string>;
    $filterString: Signal<string>;
}
export declare class CoreRuleTreeService {
    private stateMap;
    private createState;
    getState(owner: object): IRuleTreeState;
    removeState(owner: object): void;
    constructor();
    cleanEmptyFilters(node: any): any;
    getFilterString(filter: any): string;
    formatDateToYMD(date: Date): string;
    buildFormGroupFromStep(config?: any): FormGroup;
    createGroupForm(config?: any): FormGroup;
    createConditionForm(f?: any): FormGroup;
    static ɵfac: i0.ɵɵFactoryDeclaration<CoreRuleTreeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<CoreRuleTreeService>;
}
export {};