interface Blob
          
A file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.
arrayBuffer(): Promise<ArrayBuffer>
      
    
bytes(): Promise<Uint8Array>
      
    
stream(): ReadableStream<Uint8Array>
      
    
text(): Promise<string>