import type { DateTimeUnit } from "../../types/index.js";
type UtcNowUnit = DateTimeUnit | "dayOfWeek";
/**
 * Return the requested unit value from the current UTC instant.
 *
 * - Valid units: "year", "month", "week", "day", "dayOfWeek", "hour", "minute", "second", "millisecond", "microsecond", "nanosecond".
 * - Uses Temporal.Now.instant() converted to UTC.
 * - Returns "" on invalid unit or failure.
 *
 * @param unit unit to extract from current utc instant
 * @returns string representation of the requested unit or "" on invalid
 *
 * @example getUtcNowUnit("year") // "2024"
 * @example getUtcNowUnit("month") // "02"
 * @example getUtcNowUnit("invalid") // ""
 */
export declare function getUtcNowUnit(unit: UtcNowUnit): string;
export {};