/**
 * HTML to Markdown Converter
 *
 * Converts rich text HTML from the message composer to markdown
 * for storage and transmission.
 *
 * Conversion rules:
 * - <b>, <strong> → **text**
 * - <i>, <em> → _text_
 * - <s>, <strike>, <del> → ~~text~~
 * - <u> → <u>text</u> (HTML-style underline)
 * - <code> (not in pre) → `text`
 * - <pre><code> → ```text```
 * - <blockquote> → > text
 * - <a href="url">text</a> → [text](url)
 * - <ol><li> → 1. text
 * - <ul><li> → • text
 */
/**
 * Convert HTML string to markdown
 */
export declare function htmlToMarkdown(html: string): string;
/**
 * Remove escape backslashes from markdown text before sending.
 * Preserves literal markdown characters that were escaped by the user.
 *
 * Rules:
 * - Single backslash before markdown character: remove backslash, keep character
 * - Even number of backslashes: keep half of them (they escape each other)
 * - Odd number of backslashes: keep (n-1)/2 backslashes, last one escapes the markdown char
 *
 * Examples:
 * - \* → *
 * - \\* → \*
 * - \\\* → \*
 * - \\\\* → \\*
 *
 * @param text - Markdown text that may contain escape sequences
 * @returns Text with escape backslashes removed
 */
export declare function removeEscapeBackslashes(text: string): string;
/**
 * Clean up markdown output
 * - Remove excessive newlines
 * - Trim whitespace
 */
export declare function cleanMarkdown(markdown: string): string;
/**
 * Convert HTML to clean markdown
 * Removes escape backslashes before sending (Requirement 12.2)
 */
export declare function convertHtmlToMarkdown(html: string): string;