/**
 * Return an array of plain ISO date strings covering the inclusive date range between two zoned datetimes.
 *
 * - Both datetimes must have the same timezone.
 * - Returns [] for invalid inputs, mismatched timezones, start > end, or invalid step.
 *
 * @param startZonedDateTime start zoned ISO 8601 datetime string
 * @param endZonedDateTime end zoned ISO 8601 datetime string
 * @param stepDays optional positive integer step in days
 * @returns array of ISO date strings or [] when invalid
 *
 * @example mapZonedDatesInRange("2024-02-28T12:00:00+00:00[UTC]", "2024-03-02T12:00:00+00:00[UTC]") // ["2024-02-28", "2024-02-29", "2024-03-01", "2024-03-02"]
 * @example mapZonedDatesInRange("2024-02-28T12:00:00+00:00[UTC]", "2024-03-02T12:00:00+00:00[UTC]", 2) // ["2024-02-28", "2024-03-01"]
 * @example mapZonedDatesInRange("invalid", "2024-03-02T12:00:00+00:00[UTC]") // []
 */
export declare function mapZonedDatesInRange(startZonedDateTime: string, endZonedDateTime: string, ...stepDaysInput: [stepDays?: number]): string[];