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I think theoretically Node.js could work without V8, and guess some of MS's work for IoT was indeed that (swapping V8 for Chakra).

There used to be an Mozilla spidermonley based node.js too, though it isn't maintained atm.

There is an actively maintained Spidermonkey port of Node.js called jxcore. It also supports an older version of V8 from the 0.10 branch.