Right now that's not implemented. In the future potentially it could be, but obviously it only works on USB devices, and the most popular Espruino devices by far at the moment are Bluetooth ones - so it's not high priority.
I guess it depends what you want to do - but personally I find uploading code when there's no feedback hugely frustrating. Changed something and made a typo? It will then just not work, and you'll have no idea why - so generally I'd advise having some kind of serial console anyway.
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