/**
 * Copyright (c) 2026 ByteDance Ltd. and/or its affiliates
 * SPDX-License-Identifier: MIT
 *
 * Utility functions for card content conversion.
 */
export declare function escapeAttr(s: string): string;
export declare function formatMillisecondsToISO8601(milliseconds: string): string;
export declare function normalizeTimeFormat(input: string): string;