import { Temporal } from "@js-temporal/polyfill";
/**
 * Round an ISO 8601 zoned datetime string to the specified unit.
 *
 * - Returns "" for invalid inputs.
 * - Accepts "day" and time units: "hour", "minute", "second", "millisecond", "microsecond", "nanosecond".
 * - Date units ("year", "month", "week") are not supported by the Temporal polyfill's ZonedDateTime.round() — they return "".
 * - Wraps Temporal.ZonedDateTime.round() which throws on invalid options.
 * - Note: The polyfill's `.round()` does not support `disambiguation` or `offset` options.
 *
 * @param value ISO 8601 zoned datetime string
 * @param options Rounding options: smallestUnit, optional roundingIncrement, roundingMode
 * @returns Rounded ISO 8601 zoned datetime string, or "" on invalid input
 *
 * @example roundZoned("2024-06-15T12:34:56-05:00[America/New_York]", { smallestUnit: "hour" }) // "2024-06-15T13:00:00-05:00[America/New_York]"
 * @example roundZoned("2024-06-15T12:34:56-05:00[America/New_York]", { smallestUnit: "minute", roundingIncrement: 15 }) // "2024-06-15T12:45:00-05:00[America/New_York]"
 * @example roundZoned("invalid", { smallestUnit: "hour" }) // ""
 */
export declare function roundZoned(value: string, options: {
    smallestUnit: Temporal.SmallestUnit<"day" | "hour" | "minute" | "second" | "millisecond" | "microsecond" | "nanosecond">;
    roundingIncrement?: number;
    roundingMode?: Temporal.RoundingMode;
}): string;