/**
 * Get or generate a virtual ID for a blob object.
 * Virtual ID is immutable once generated.
 *
 * @param blob the Blob or File
 * @param id (optional) Use this ID instead of generating one the first time.
 * @return the blog virtual ID
 */
export declare const getOrGenerateBlobId: (blob: Blob | File, id?: string) => any;