import { Observable } from 'rxjs';
import { MainService } from '../main/main.service';
import { SystemConnection } from '../models/system';
import * as i0 from "@angular/core";
/**
 * system service for drupal
 * @see BACK_END/admin/structure/services/list/END_POINT/resources for more details
 */
export declare class SystemService extends MainService {
    entityType: string;
    /**
     * if there is already a token in the browser cookies and it is not expired it will return it
     * this will fetch a new token before trying to connect
     * @param refreshToken boolean to force the application to request new token
     * @return observable of the connect method
     * the subscription data is an object of SystemConnection interface
     */
    connect(refreshToken?: boolean): Observable<SystemConnection>;
    /**
     * implement get_variable resource
     * @param variableName the name of the variable
     * @return the value of the variable
     */
    getVariable(variableName: string): Observable<any[]>;
    /**
     * implement set_variable resource
     * @param variableName the name of the variable
     * @param value the value to set for the variable
     * @return always null, take care of overriding old variables with same name
     */
    setVariable(variableName: string, value: any): Observable<null>;
    /**
     * implement del_variable resource
     * @param variableName variable name to delete
     * @return null if variable found or not.
     */
    delVariable(variableName: string): Observable<null>;
    static ɵfac: i0.ɵɵFactoryDeclaration<SystemService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<SystemService>;
}