/**
 * Parse a zoned datetime and return the plain local datetime portion as an ISO plain datetime string.
 *
 * - Uses Temporal.ZonedDateTime.from to parse.
 * - Rejects leap seconds.
 * - Returns "" for invalid input.
 *
 * @param value zoned ISO 8601 datetime string
 * @returns plain local datetime string or "" when invalid
 *
 * @example parseDateTimeFromZoned("2024-02-29T12:34:56.789+00:00[UTC]") // "2024-02-29T12:34:56.789"
 * @example parseDateTimeFromZoned("invalid") // ""
 */
export declare const parseDateTimeFromZoned: (value: string) => string;