/**
 * Vendored, dependency-free copy of the app's blob helpers. Standard Reader
 * images are AT-Proto blobs referenced by CID; the Bluesky CDN serves any PDS
 * blob by `(did, cid)`, so these two helpers are all the renderer needs to turn
 * a blob ref into an `<img src>`.
 */
/** A blob ref as it appears in a decoded record. */
export interface BlobRef {
    ref?: string | {
        $link?: string;
        ["/"]?: string;
        toString?: () => string;
    } | null;
    mimeType?: string;
    size?: number;
}
/**
 * Pull the CID string out of a blob ref. Handles the shapes a `ref` can take
 * depending on how the record was decoded: a bare CID string, a `{$link: cid}`
 * object (plain dag-json), a `{"/": cid}` object (dag-json link form), or a
 * multiformats `CID` instance (stringified).
 */
export declare function blobCid(blob: BlobRef | undefined | null): string | null;
/**
 * Build a Bluesky CDN image URL for a PDS blob. The CDN transcodes to the
 * requested format (`@jpeg` for photos, `@png` when alpha must be preserved)
 * and serves it with long cache headers + inline disposition — suitable for a
 * browser `<img src>`.
 */
export declare function cdnImageUrl(did: string, cid: string, format?: "jpeg" | "png"): string;
//# sourceMappingURL=blob.d.ts.map