Note: This feature is available in Web Workers.
The encoding read-only property of the TextDecoderStream interface returns a string containing the name of the encoding algorithm used by the specific decoder.
The encoding is set by the constructor label parameter, and defaults to utf-8.
A string containing the lower-cased ASCII name of the encoding format.
The allowed values are the same as those listed in TextDecoder.encoding (the labels in Encoding API Encodings).
Returning the value of encoding from a TextDecoderStream.
stream = new TextDecoderStream();
console.log(stream.encoding); // returns the default "utf-8"