/**
 * Return the millisecond (0-999) for a given ISO 8601 datetime string.
 *
 * - Returns zero-padded string for millisecond.
 * - Returns "" for invalid input.
 *
 * @param value ISO datetime string
 * @returns Millisecond (000-999) or "" on invalid input
 *
 * @example parseMillisecondFromDateTime("2024-03-15T14:30:45.123") // "123"
 * @example parseMillisecondFromDateTime("2024-03-15T14:30:45.000") // "000"
 * @example parseMillisecondFromDateTime("invalid") // ""
 */
export declare function parseMillisecondFromDateTime(value: string): string;