/**
 * Sanitizes email HTML to prevent XSS and other security issues while
 * preserving the original visual appearance (layout, colors, fonts, etc.).
 *
 * This differs from the markdown sanitizer (`sanitizeHTML`) in that:
 * - **All inline CSS is preserved** (no style property filtering).
 * - Dangerous CSS properties like `behavior`, `expression`, `-moz-binding` are removed.
 * - Standard dangerous tags/attributes are blocked (script, event handlers, javascript: URLs).
 *
 * @param html - The HTML string to sanitize (typically an email body).
 * @returns The sanitized HTML string.
 */
export declare function sanitizeEmailHTML(html: string): Promise<string>;
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