/**
 * Sort an array of ZonedDateTime values in ascending or descending order.
 *
 * - Invalid dates are filtered out.
 * - Defaults to ascending order (earliest first).
 * - Returns empty array if no valid dates.
 *
 * @param zonedDateTimes Array of ISO ZonedDateTime strings
 * @param order "asc" for ascending (earliest first) | "desc" for descending (latest first)
 * @returns Sorted array of zoned datetime strings
 *
 * @example sortZoned(["2024-03-10T12:00:00[America/New_York]", "2024-01-01T08:00:00[America/New_York]", "2024-02-15T15:30:00[America/New_York]"]) // ["2024-01-01T08:00:00-05:00[America/New_York]", "2024-02-15T15:30:00-05:00[America/New_York]", "2024-03-10T12:00:00-04:00[America/New_York]"]
 * @example sortZoned(["2024-03-10T12:00:00[America/New_York]", "2024-01-01T08:00:00[America/New_York]", "2024-02-15T15:30:00[America/New_York]"], "desc") // ["2024-03-10T12:00:00-04:00[America/New_York]", "2024-02-15T15:30:00-05:00[America/New_York]", "2024-01-01T08:00:00-05:00[America/New_York]"]
 * @example sortZoned(["invalid", "2024-01-01T08:00:00[America/New_York]", "2024-02-15T15:30:00[America/New_York]"]) // ["2024-01-01T08:00:00-05:00[America/New_York]", "2024-02-15T15:30:00-05:00[America/New_York]"]
 * @example sortZoned([]) // []
 */
export declare function sortZoned(zonedDateTimes: string[], order?: "asc" | "desc"): string[];