import { type UnixUnit } from "../../unix/validate/isValidUnixUnit.js";
/**
 * Convert a unix epoch value to a zoned ISO 8601 datetime string.
 *
 * - Converts to ZonedDateTime using the specified timezone.
 * - Validates value, timezone, and epoch unit.
 * - Returns "" for invalid input.
 *
 * @param value epoch value (number)
 * @param timeZone IANA timeZone identifier
 * @param unit optional unit, "seconds" or "milliseconds"
 * @returns zoned ISO 8601 string or "" on invalid
 *
 * @example convertUnixToZoned(1709164800000, "America/New_York") // "2024-02-29T00:00:00-05:00[America/New_York]"
 * @example convertUnixToZoned(1709164800, "UTC", "seconds") // "2024-02-29T00:00:00+00:00[UTC]"
 * @example convertUnixToZoned(-1, "UTC") // "1969-12-31T23:59:59.999Z[UTC]"
 */
export declare function convertUnixToZoned(value: number, timeZone: string, ...unitInput: [unit?: UnixUnit]): string;