The TextEncoderStream() constructor creates a new TextEncoderStream object which is used to convert a stream of strings into bytes using UTF-8 encoding.

None.

In this example a TextEncoderStream is created and used to upload a stream of text.

const body = textStream.pipeThrough(new TextEncoderStream());
fetch("/dest", {
  method: "POST",
  body,
  headers: { "Content-Type": "text/plain; charset=UTF-8" },
});