//#region src/adapter/adapter.utils.d.ts
/**
 * Shared `today()` helper for adapters whose date type is the native `Date`.
 * Returns midnight local time (year/month/day with no time component) so that
 * the returned reference is comparable with other adapters' midnight outputs.
 */
declare function nativeToday(): Date;
declare function buildCalendarLocaleTag(locale: string, calendar: string): string;
/**
 * Creates a single-slot per-adapter-instance cache for Gregorian-to-calendar
 * conversions, keyed by date ordinal.
 *
 * **Hit pattern (intentional):** the 3 sequential calls `getYear` / `getMonth` /
 * `getDate` on the same date hit the cache 2/3 times. Every cursor advance in
 * `buildCalendarMonth` invalidates the slot, so cross-cell sharing only happens
 * for repeated reads on the same cell.
 *
 * **Not** a multi-slot LRU. Two adapter instances on the same page get separate
 * slots (via the `WeakMap` keyed by instance), but a single adapter rendering
 * two months in the same React tree will thrash on every advance. If that
 * becomes a hot path, replace this with an ordinal-keyed LRU.
 */
declare function createConversionCache<T>(convert: (date: Date) => T): {
  get(instance: object, date: Date): T;
};
/**
 * Formats a date using Intl.DateTimeFormat with a specific calendar system.
 * Handles locale tag construction and formatter caching.
 *
 * @param numberingSystem - Optional Unicode numbering system (e.g. 'arabext' for Persian).
 *   Appends `-nu-<value>` to the locale tag if not already present.
 */
declare function formatWithCalendar(date: Date, options: Intl.DateTimeFormatOptions, baseLocale: string, calendar: string, locale?: string, numberingSystem?: string): string;
//#endregion
export { buildCalendarLocaleTag, createConversionCache, formatWithCalendar, nativeToday };