Re: [streams] TransformStream: transform() is never invoked via pull() (#330)

> TransformStream: transform() is never invoked via pull()

Unclear how to relate the issue title to the text...

> Maybe what we want to do is not to start transform while there's back-pressure on readable.

Yes, this seems like a clear win.

> Since underlying sink write() method takes only one signal, i.e. fulfillment of the promise returned, we cannot exert back-pressure and success/fail of the transform separately.

I don't quite follow the reasoning here. If we want to exert back-pressure we can change `transform.writable.state`. If we want to signal success/failure of the transform, we use the return value of `transform.writable.write()`. What am I missing? Code might help :)

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https://github.com/whatwg/streams/issues/330#issuecomment-93631616