https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream/writable
TextDecoderStream: writable property - Web APIs | MDN
The writable read-only property of the TextDecoderStream interface returns a WritableStream that accepts binary data, in the form of ArrayBuffer, TypedArray,...
web apistextdecoderstreamwritablepropertymdn
https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream/readable
TextDecoderStream: readable property - Web APIs | MDN
The readable read-only property of the TextDecoderStream interface returns a ReadableStream that emits decoded strings.
web apistextdecoderstreamreadablepropertymdn