import type { DateTimeUnit } from "../../types/index.js";
type NowUnit = DateTimeUnit | "dayOfWeek";
/**
 * Return the requested current unit value using the system timeZone.
 *
 * - Valid units: "year", "month", "week", "day", "dayOfWeek", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond".
 * - Uses Temporal.Now.zonedDateTimeISO to get current time in system timezone.
 * - Returns "" when unit is invalid or system timezone is unavailable.
 *
 * @param unit unit to extract from current local time
 * @returns string representation of the requested unit or "" on invalid
 *
 * @example getNowUnit("year") // "2024"
 * @example getNowUnit("month") // "03"
 * @example getNowUnit("week") // "11"
 * @example getNowUnit("day") // "15"
 * @example getNowUnit("dayOfWeek") // "5"
 * @example getNowUnit("hour") // "14"
 * @example getNowUnit("minute") // "30"
 * @example getNowUnit("second") // "45"
 * @example getNowUnit("millisecond") // "000"
 * @example getNowUnit("microsecond") // "000"
 * @example getNowUnit("nanosecond") // "000"
 * @example getNowUnit("invalid") // ""
 */
export declare function getNowUnit(unit: NowUnit): string;
export {};