Re: [whatwg/streams] light weight transformations (#461)

thanks!

reading the spec, I see [pipeThrough](https://streams.spec.whatwg.org/#rs-pipe-through)
but I don't understand what you mean by "not reifying" the stream.

I'm not sure whether you where implying `TransformStream.map` in the functional sense of "map",
but there is definite need for a transform to be able to expand and contract the input.

Is the `syncMap` function passed a chunk? I'm talking about something that is passed the preceding readable.

I'd not particularily bothered by actual IO etc, being a "writable" stream, I do think it's simpler if they are {readable, reader} but I'm not gonna labour that. I'm also not against a transform stream that turns into a writable stream when you try to use it like that. 

This is similar to the [pipeFrom](https://github.com/whatwg/streams/issues/146)
idea, but instead of explicitly using `pipeFrom`, you'd just use `pipeThrough` and it would detect if it would rather do get the readable.

---
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/streams/issues/461#issuecomment-222864770