/**
 * Email body HTML often references inline attachments via `cid:<id>`
 * URLs (e.g. `<img src="cid:logo123">`). Those `cid:` refs are
 * meaningless outside the original mail viewer. To make markdown /
 * HTML output self-contained we replace each `cid:<id>` with a base64
 * `data:` URI sourced from the matching inline attachment.
 *
 * Hardening #1: only `image/*` content-types are embedded. Anything
 * else (`text/html`, `application/javascript`, ...) would let an
 * attacker turn an attachment into an executable payload via the
 * data URI; skip and leave the original `cid:` ref in place.
 */
type InlineAttachment = {
    readonly contentId: string;
    readonly contentType: string;
    readonly contentBytes: string;
};
declare const embedInlineImages: (html: string, attachments: ReadonlyArray<InlineAttachment>) => string;
export { embedInlineImages };
export type { InlineAttachment };