Synchronously decodes a Base64 Data URL into its constituent parts.
This function only supports Base64 encoded Data URLs.
The Base64 Data URL string (e.g., "data:image/png;base64,iVBOR...").
An object containing the decoded Uint8Array and the MIME type.
An error if the input is not a valid or supported Data URL.
Synchronously decodes a Base64 Data URL into its constituent parts.
This function only supports Base64 encoded Data URLs.