/**
 * Rewrites `cid:` references in `src`/`href` attributes using a resolver.
 *
 * Useful for turning inline (Content-ID) image references into hosted URLs for previews/webmail, or
 * for normalizing them. Returning `undefined` from the resolver leaves that reference unchanged.
 * @param html The HTML email.
 * @param resolver Maps a Content-ID to a replacement URL (or `undefined` to keep it).
 * @returns The rewritten HTML.
 */
declare const rewriteCidLinks: (html: string, resolver: (cid: string) => string | undefined) => string;
/**
 * Collects the Content-IDs referenced via `cid:` in `src`/`href` attributes.
 * @param html The HTML email.
 * @returns The referenced Content-IDs (de-duplicated, in first-seen order).
 */
declare const extractCidReferences: (html: string) => string[];
export { extractCidReferences, rewriteCidLinks };