Returns a readable stream whose chunks are strings resulting from running encoding's decoder on the chunks written to writable.

Returns a writable stream which accepts [AllowShared] BufferSource chunks and runs them through encoding's decoder before making them available to readable.

Typically this will be used via the pipeThrough() method on a ReadableStream source.

var decoder = new TextDecoderStream(encoding);
byteReadable
  .pipeThrough(decoder)
  .pipeTo(textWritable);

If the error mode is "fatal" and encoding's decoder returns error, both readable and writable will be errored with a TypeError.