/**
 * WeChat MP text normalization utilities
 *
 * Provides markdown-friendly text normalization that can be shared between
 * the reply pipeline (dispatch.ts) and direct outbound (outbound.ts).
 *
 * The normalization behavior is controlled by the `renderMarkdown` config:
 * - true (default): Apply markdown-friendly formatting for WeChat MP
 * - false: Minimal passthrough, preserving original text
 */
/** WeChat MP text message byte limit (2048 bytes) */
export declare const WECHAT_TEXT_BYTE_LIMIT = 2048;
/**
 * Calculate UTF-8 byte length of a string.
 * @param str - The string to measure
 * @returns The byte length in UTF-8 encoding
 */
export declare function getUtf8ByteLength(str: string): number;
/**
 * Split text by byte limit, respecting boundaries (paragraphs, sentences, spaces).
 * Ensures no multi-byte characters are truncated.
 *
 * @param text - The text to split
 * @param maxBytes - Maximum bytes per chunk (default: WECHAT_TEXT_BYTE_LIMIT)
 * @returns Array of text chunks, each within the byte limit
 */
export declare function splitTextByByteLimit(text: string, maxBytes?: number): string[];
/**
 * Truncate text to fit within a byte limit.
 * Tries to find a good boundary (paragraph, sentence, space) for truncation.
 *
 * @param text - The text to truncate
 * @param maxBytes - Maximum bytes for the result
 * @returns Truncated text within the byte limit
 */
export declare function truncateTextByByteLimit(text: string, maxBytes?: number): string;
/**
 * Normalize text for WeChat MP delivery.
 *
 * When renderMarkdown is enabled (default), converts markdown to WeChat MP
 * friendly plain text. When disabled, returns text with minimal changes.
 *
 * @param text - The raw text to normalize
 * @param renderMarkdown - Whether to apply markdown-friendly formatting
 * @returns Normalized text ready for WeChat MP delivery
 */
export declare function normalizeWechatMpText(text: string, renderMarkdown: boolean): string;
/**
 * Resolve the renderMarkdown setting from account config.
 * Defaults to true if not explicitly set to false.
 */
export declare function resolveRenderMarkdown(config: {
    renderMarkdown?: boolean;
}): boolean;
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