declare const REIWA = "\u4EE4\u548C";
declare const HEISEI = "\u5E73\u6210";
declare const SHOWA = "\u662D\u548C";
declare const TAISHO = "\u5927\u6B63";
declare const MEIJI = "\u660E\u6CBB";
type Geongo = typeof REIWA | typeof HEISEI | typeof SHOWA | typeof TAISHO | typeof MEIJI;
declare const WAREKI_START_YEARS: {
    readonly r: 2019;
    readonly R: 2019;
    readonly 令和: 2019;
    readonly h: 1989;
    readonly H: 1989;
    readonly 平成: 1989;
    readonly s: 1926;
    readonly S: 1926;
    readonly 昭和: 1926;
    readonly t: 1912;
    readonly T: 1912;
    readonly 大正: 1912;
    readonly m: 1868;
    readonly M: 1868;
    readonly 明治: 1868;
};
declare const warekiReg: {
    dateString: RegExp;
    wareki: RegExp;
    eraDetection: RegExp;
};
type WarekiResult<T> = {
    isValid: boolean;
    result: T;
    formatted: string;
};
declare function selectGengo(year: number, month: number, date: number): Geongo;
declare function fullWidthToHalfWidth(dateString: string): string;
declare function dateToWareki(d: string | Date): WarekiResult<string>;
export declare function warekiToDate(wareki: string): WarekiResult<Date>;
/**
 * Check if the input string appears to be a Japanese era format
 * This is used for initial screening before attempting to parse
 *
 * @param inputString - The input string to check
 *
 * @returns true if the string appears to be a Japanese era format
 */
export declare function isJapaneseEraFormat(inputString: string): boolean;
/**
 * Converts a Western calendar year to an era label string for display in YearSelector.
 *
 * Uses December 31 to resolve era transition years to the later era:
 *   2019 → 令和元年 (ja) / Reiwa 1 (en)
 *   1989 → 平成元年 (ja) / Heisei 1 (en)
 *   1926 → 昭和元年 (ja) / Showa 1 (en)
 *   1912 → 大正元年 (ja) / Taisho 1 (en)
 * Years before MEIJI_START_YEAR (< 1868): "1867年" (ja) / "1867" (en)
 * First year of each era: "元年" suffix in Japanese (e.g., 令和元年, not 令和1年)
 *
 * @param year - Western calendar year (e.g., 2025)
 *
 * @param locale - 'ja' for Japanese labels, 'en' for romanized labels
 *
 * @returns Era label string (e.g., "令和7年", "令和元年", "Reiwa 7", "1867年", "1867")
 */
export declare function yearToEraLabel(year: number, locale: 'ja' | 'en'): string;
/**
 * Formats a Date to a short English era string for display in the DatePicker trigger input.
 * Format: "{EraName} {eraYear}/{MM}/{DD}" (e.g., "Reiwa 7/03/06").
 * For pre-Meiji dates (year < 1868): falls back to the Gregorian year (e.g., "1867/03/06").
 *
 * @param date - The date to format
 *
 * @returns Short English era string (e.g., "Reiwa 7/03/06")
 */
export declare function dateToEnglishEraShort(date: Date): string;
/**
 * Formats a Date to a short English era string for display in the MonthPicker trigger input.
 * Format: "{EraName} {eraYear}/{MM}" (e.g., "Reiwa 7/03").
 * For pre-Meiji dates (year < 1868): falls back to the Gregorian year (e.g., "1867/03").
 *
 * @param date - The date to format
 *
 * @returns Short English era month string (e.g., "Reiwa 7/03")
 */
export declare function dateToEnglishEraMonthShort(date: Date): string;
/**
 * Formats a Date to a Japanese-era string with day precision (e.g., "令和7年3月6日").
 * Uses the platform's built-in `ja-JP-u-ca-japanese` calendar.
 *
 * @param date - The date to format
 *
 * @returns Japanese era string with day (e.g., "令和7年3月6日")
 */
export declare function dateToJapaneseEra(date: Date): string;
/**
 * Formats a Date to a Japanese-era string with month precision (e.g., "令和7年3月").
 * Uses the platform's built-in `ja-JP-u-ca-japanese` calendar.
 *
 * @param date - The date to format
 *
 * @returns Japanese era month string (e.g., "令和7年3月")
 */
export declare function dateToJapaneseEraMonth(date: Date): string;
export { warekiReg, dateToWareki, fullWidthToHalfWidth, selectGengo, WAREKI_START_YEARS };
export type { WarekiResult };