/**
 * Escapes HTML special characters using Unicode placeholders.
 * These must be converted to HTML entities after diffing using unescapeDiffHTML.
 */
export declare function escapeDiffHTML(value: boolean | null | number | string | undefined): string;
/**
 * Converts Unicode placeholder characters to HTML entities.
 * Call this on the final HTML output after diffing.
 */
export declare function unescapeDiffHTML(html: string): string;
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