/**
 * Security sanitization utilities
 *
 * Functions for sanitizing user-controlled or externally-sourced content
 * before interpolation into Markdown output or client-facing error messages.
 */
/**
 * Escape Markdown special characters in text to prevent Markdown injection.
 * Use this for titles, snippets, and other text interpolated into Markdown.
 */
export declare function sanitizeMarkdownText(text: string): string;
/**
 * Sanitize a URL for use in Markdown link syntax.
 * - Only allows https: protocol
 * - Percent-encodes parentheses to prevent breaking Markdown links
 * - Returns '#' for invalid or non-https URLs
 */
export declare function sanitizeMarkdownUrl(url: string): string;
/**
 * Extract and sanitize an error message from an unknown thrown value.
 */
export declare function getSafeErrorMessage(error: unknown): string;
/**
 * Sanitize error messages before returning to clients.
 * - Replaces backend hostnames with frontend equivalents
 * - Removes absolute file paths
 * - Removes stack traces
 */
export declare function sanitizeErrorMessage(message: string): string;
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