/**
 * Strip HTML (and ESI-style) comments from a markup string prior to XML parsing.
 *
 * Behavior:
 * - Removes all well-formed comment blocks: `<!-- ... -->`, including multiline
 *   content, using a non-greedy match.
 * - Also removes a dangling or unterminated `<!-- ...` that runs to end-of-input,
 *   which commonly appears in malformed real-world HTML.
 * - Leaves all non-comment text untouched.
 *
 * Intended use:
 * - Run early in the HTML→XML/Hson preflight pipeline to avoid confusing the XML
 *   parser with comments, especially malformed ones.
 * - Safe to compose with other preflight transforms; this function has no side
 *   effects outside comment removal.
 *
 * @param input - Raw markup string that may contain HTML comments.
 * @returns Markup string with all comments removed.
 */
export declare function strip_html_comments(input: string): string;
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