import { type UnixUnit } from "../validate/index.js";
/**
 * Return the week number from a unix epoch value.
 *
 * - By default uses ISO weeks (Monday-based).
 * - Returns null for invalid input.
 *
 * @param value unix epoch in milliseconds or seconds (number or string)
 * @param options optional: epochUnit ("seconds" | "milliseconds"), timeZone (IANA), weekStartsOn ("monday" | "sunday")
 * @returns Week number (1-53) or null on invalid input
 *
 * @example parseWeekFromUnix(1704067200000) // 1
 * @example parseWeekFromUnix(1704067200000, { weekStartsOn: "sunday" }) // 1
 * @example parseWeekFromUnix(-86400, { epochUnit: "seconds" }) // 1
 */
export declare function parseWeekFromUnix(value: number | string, options?: {
    epochUnit?: UnixUnit;
    timeZone?: string;
    weekStartsOn?: "monday" | "sunday";
}): number | null;