/** Strip leaked markdown title / whitespace from a data URI payload. */
export declare function normalizeDataUri(dataUri: string): string;
/**
 * Decode a `data:image/…;base64,…` URL into a File.
 * Uses `atob` instead of `fetch` — large data URIs fail with ERR_INVALID_URL.
 */
export declare function dataUriToFile(dataUri: string, fallbackName?: string): Promise<File>;