What's the difference between a WriteSteam and WritableStream?

Question

const response = await fetch('https://www.google.com')
response.body.pipeThrough(new TextDecoderStream()).pipeTo(process.stdout)

TypeError [ERR_INVALID_ARG_TYPE]: The "transform.writable" property must be an instance of WritableStream. Received an instance of WriteStream

Questions

1. What is the difference between Writable and Write steams?
2. Can the WriteSteam (process.stdout) be converted to a writable stream?

---

Attempts

I tried to make stdout writable to no avail:

// fails
process.stdout.writable = true
response.body.pipeTo(process.stdout)

Some methods that work include:

// works
const response = await fetch('http://www.google.com')
const reader = response.body.pipeThrough(new TextDecoderStream())
for await (const chunk of reader){
  process.stdout.write(chunk)
}

// works
Readable.fromWeb(response.body).pipe(process.stdout)

I don't exactly understand the difference between a "web" stream and a "node" stream, which I'm guessing are just source and destination, but I thought every I/O stream was able to redirect to each other. It seems like using the Readable.fromWeb works, but what is it doing? It seems inefficient.

Can the reverse be done to process.stdout? Something like...

response.body.pipeTo(new WritableStream(process.stdout)

Answer 1

WriteStream is a stream that is writable to a file.

WritableStream is a stream that is writable to a destination. It can be a file, a socket, a pipe, etc.

Answer 2

Can the reverse be done to process.stdout? Something like...

Yes, see Stream.Writable.toWeb.