/**
 * Convert a base64 string to a Blob.
 * Handles various formats: data URL, raw base64, and URL-safe base64.
 *
 * @param base64   - The base64 string to convert
 * @param mimeType - MIME type for the resulting Blob, defaults to 'image/jpeg'
 * @returns Blob created from the base64 data
 * @throws {Error} When the input is a URL or invalid base64
 */
export declare function base64ToBlob(base64: string, mimeType?: string): Blob;
/**
 * Ensure input is a Blob. If the input is a base64 string, convert it.
 * If already a Blob or File, return as-is.
 *
 * @param input    - Blob, File, or base64 string
 * @param mimeType - MIME type for conversion, defaults to 'image/jpeg'
 * @returns Blob ready for FormData
 */
export declare function ensureBlob(input: Blob | File | string, mimeType?: string): Blob;
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