import { Temporal } from '@js-temporal/polyfill-patched';
import { NepaliPlainDate } from '../custom-calendars/nepaliCalendar';
import { SupportedCalendar } from '../types';
/**
 * A date value that is either a real Temporal.PlainDate (any CLDR calendar)
 * or a hand-rolled implementation for a calendar Temporal doesn't support
 * natively (currently just NepaliPlainDate). Lives here rather than under
 * custom-calendars/ since it's a general date-representation concern used
 * throughout hooks and period-calculation, not something specific to the
 * Nepali calendar - a future second custom calendar would extend this union
 * and register itself in customPlainDateImplementations below, not change
 * anything Nepali-specific.
 */
export type AnyPlainDate = Temporal.PlainDate | NepaliPlainDate;
export declare const isNepaliPlainDate: (date: AnyPlainDate) => date is NepaliPlainDate;
/**
 * Converts to a genuine ISO 8601 Temporal.PlainDate - for comparisons/arithmetic
 * that must be calendar-agnostic, and for re-deriving a date's ISO position
 * before reinterpreting it in a different calendar. A real (non-Nepali)
 * Temporal.PlainDate still carries its own calendar tag and must be
 * re-tagged via withCalendar - it is NOT already ISO just because it isn't
 * Nepali.
 */
export declare const toIsoPlainDate: (date: AnyPlainDate) => Temporal.PlainDate;
/** Same day AND same calendar - mirrors Temporal.PlainDate.prototype.equals' calendar-sensitivity. */
export declare const isSameDate: (a: AnyPlainDate, b: AnyPlainDate) => boolean;
type CustomPlainDateImplementation = {
    from: (fields: {
        year: number;
        month: number;
        day: number;
    }, options?: Temporal.AssignmentOptions) => AnyPlainDate;
    fromIso: (isoDate: Temporal.PlainDate) => AnyPlainDate;
};
export declare const getCustomPlainDateImplementation: (calendar: SupportedCalendar) => CustomPlainDateImplementation | undefined;
export {};