/**
 * Formatted-HTML post-processing for merged composites: span optimization and
 * cleanup. Pure string transforms, no I/O.
 */
/**
 * Optimize formatted HTML by merging spans with similar or compatible styling.
 * Header elements get more permissive merge rules (same size + family wins,
 * color may be missing on some spans).
 */
export declare function optimizeFormattedHtml(html: string, isHeaderElement?: boolean): string;
/**
 * Clean up formatted HTML by removing empty span-wrapped headers and
 * collapsing runs of whitespace.
 */
export declare function cleanupFormattedHtml(html: string): string;
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