Description
See #143 (comment)
We should add subprocess.readableStream(), subprocess.writableStream() and subprocess.transformStream(). Those behave like subprocess.readable(), subprocess.writable() and subprocess.duplex() (see #912) but return web streams instead of Node.js streams.
One approach would be to use Readable.toWeb(subprocess.readable()), Writable.toWeb(subprocess.writable()) and Duplex.toWeb(subprocess.duplex()).
Another approach would be to re-implement this from scratch, i.e. call new ReadableStream(...) and so on.
Regardless, this should be tested thoroughly, just like the Node.js streams methods.
(Note to implementer: we need to remember to make it work on early errors too (see https://github.com/sindresorhus/execa/blob/main/lib/return/early-error.js).)
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