/**
 * Utility functions for WikitextHighlighter.
 * Includes HTML escaping, span creation, and bracket matching for parsing wikitext syntax.
 */
/**
 * Escape HTML special characters to prevent injection.
 *
 * Converts &, <, >, ", and ' to their HTML entity equivalents.
 * Use before inserting user text into HTML to prevent XSS vulnerabilities.
 * Some people are too clever for their own good.
 *
 * @param text - The text to escape
 * @returns Escaped HTML text
 * @example
 * escapeHtml("<script>alert('xss')</script>")
 * // Returns: "&lt;script&gt;alert(&#x27;xss&#x27;)&lt;/script&gt;"
 */
export declare function escapeHtml(text: string): string;
/**
 * Escape a string for safe use inside RegExp constructors.
 *
 * Replaces regex metacharacters with escaped versions so user provided keywords
 * can be interpolated into dynamic regular expressions safely.
 *
 * @param value - Raw string to escape
 * @returns Escaped string suitable for new RegExp()
 */
export declare function escapeRegExp(value: string): string;
/**
 * Wrap text in a styled span element.
 *
 * Creates an HTML span with the given class name. If className is empty,
 * returns escaped text without span wrapping for efficiency.
 *
 * @param text - The text content
 * @param className - CSS class name(s), or empty string for no wrapping
 * @returns HTML span element or escaped text
 * @example
 * createSpan("bold", "wt-strong")
 * // Returns: "<span class="wt-strong">bold</span>"
 *
 * @example
 * createSpan("plain", "")
 * // Returns: "plain"
 */
export declare function createSpan(text: string, className: string): string;