import { Observable } from "rxjs";
import { Tip } from "./models/types";
import { IEnSrvOptions } from "./IEnSrvOptions";
export interface IFormulaOptions {
    context?: Tip;
    contextBranch?: Tip;
    vars?: object;
    lang?: string | string[];
}
export declare function evalFormula(formulaStr: string, enSrvOptions: IEnSrvOptions, formulaOptions?: IFormulaOptions): Observable<string[]>;