/**
 * SVG cleanup and optimization utilities
 */
/**
 * Removes empty attributes from SVG elements
 */
export declare function removeEmptyAttributes(svgContent: Element | string): string;
/**
 * Removes comments from SVG content
 *
 * This function uses iterative replacement to handle nested comments correctly
 * and includes input length validation to prevent ReDoS attacks.
 *
 * The function handles cases like:
 * - Simple comments: <!-- comment -->
 * - Nested comments: <!--<!-- inner -->-->
 * - Multiple comments: <!-- one --><!-- two -->
 */
export declare function removeComments(svgContent: string): string;
/**
 * Normalizes whitespace in SVG content
 */
export declare function normalizeWhitespace(svgContent: string): string;
/**
 * Optimizes SVG by removing empty attributes, comments, and normalizing whitespace
 */
export declare function optimizeSVG(svgContent: Element | string): string;