/**
 * Format a date using token-based format strings.
 *
 * Supported tokens:
 * - YYYY: 4-digit year
 * - YY: 2-digit year
 * - MMMM: Full month name (January)
 * - MMM: Short month name (Jan)
 * - MM: 2-digit month (01-12)
 * - M: Month (1-12)
 * - DD: 2-digit day (01-31)
 * - D: Day (1-31)
 * - dddd: Full weekday name (Wednesday)
 * - ddd: Short weekday name (Wed)
 * - d: Narrow weekday (W)
 * - HH: 24-hour padded (00-23)
 * - H: 24-hour (0-23)
 * - hh: 12-hour padded (01-12)
 * - h: 12-hour (1-12)
 * - mm: Minutes padded (00-59)
 * - m: Minutes (0-59)
 * - ss: Seconds padded (00-59)
 * - s: Seconds (0-59)
 * - A: AM/PM
 * - a: am/pm
 * - Z: Timezone offset (+0800)
 *
 * @param inputDate - A Date object or ISO 8601 string
 * @param formatStr - Token-based format string (default: 'YYYY-MM-DD')
 * @param localeOrOptions - A locale string or options object with locale and tz (IANA timezone)
 */
export declare function format(inputDate: DateInput, formatStr?: string, localeOrOptions?: string | FormatOptions): string;
declare interface FormatOptions {
  locale?: string
  tz?: string
}
declare type DateInput = Date | string;