/** Prefix used to distinguish inline data URLs from remote/local image references. */
export declare const INLINE_IMAGE_DATA_URL_PREFIX = "data:";
/** Sniffs supported inline image formats from decoded bytes. */
export declare function sniffInlineImageMime(buffer: Buffer): string | undefined;
/** Canonicalizes trusted inline image data URLs and rejects malformed or non-image payloads. */
export declare function sanitizeInlineImageDataUrl(imageUrl: string): string | undefined;
