import { Temporal } from '@js-temporal/polyfill-patched';
import { CalendarDate, SupportedCalendar } from '../types';
type ConvertDateFn = (date: string | Temporal.PlainDateLike, calendar: SupportedCalendar) => CalendarDate;
/**
 * converts from an iso8601 (gregorian) date to a specific calendar
 *
 * @param date string in the format yyyy-MM-dd
 * @param userCalendar the calendar to covert to
 * @returns an object representing the date
 *
 * NOTE: the returned object contains two properties year and eraYear
 * to be consistent with the default behaviour of Temporal. `eraYear` is only
 * populated for calendars that have an era concept - this includes not just
 * Ethiopic but also Gregorian (AD) and others; Islamic, for example, has
 * none and always leaves it undefined. When accessing year, consumers
 * should be defensive and do: `const yearToUse = result.eraYear ?? result.year`.
 *
 * @see https://github.com/tc39/ecma402/issues/534 for more details
 */
export declare const convertFromIso8601: ConvertDateFn;
/**
 * converts from a specific calendar (i.e. ethiopic or nepali) to iso8601 (gregorian)
 *
 * @param date calendar date in the format yyyy-MM-dd
 * @param userCalendar the calendar to convert from
 * @returns an object representing the iso8601 date
 */
export declare const convertToIso8601: ConvertDateFn;
export {};