import { NepaliDate } from "./types";
export declare const MONTH_NAMES_EN: string[];
export declare const MONTH_NAMES_NP: string[];
export declare function supportedYearsError(): Error;
export declare function isValidNepaliDate(date: NepaliDate): boolean;
export declare function isValidNepaliMonth(year: number, month: number): boolean;
/** Converts an AD Date to a Nepali (BS) date. */
export declare function convertToNepali(ad: Date): Promise<NepaliDate>;
/** Convenience overload accepting a yyyy-MM-dd string in AD. */
export declare function convertToNepaliFromString(ad: string): Promise<NepaliDate>;
/** Converts a Nepali (BS) date to an AD date (as a yyyy-MM-dd string). */
export declare function convertToAd(nepaliDate: NepaliDate): Promise<string>;