/**
 * Return the earliest (minimum) of the given ZonedDateTime values.
 *
 * - Returns null if the array is empty or contains no valid dates.
 * - Validation is performed on each item in the array.
 *
 * @param zonedDateTimes Array of ISO ZonedDateTime strings
 * @returns The earliest zoned datetime string, or null on invalid input
 *
 * @example minZoned(["2024-03-10T12:00:00[America/New_York]", "2024-03-15T12:00:00[America/New_York]"]) // "2024-03-10T12:00:00-05:00[America/New_York]"
 * @example minZoned(["invalid", "2024-03-15T12:00:00[America/New_York]"]) // "2024-03-15T12:00:00-04:00[America/New_York]"
 * @example minZoned(["invalid", "also invalid"]) // null
 * @example minZoned([]) // null
 */
export declare function minZoned(zonedDateTimes: string[]): string | null;