I think the appropriate term for this is a pretty-printer. It isn't really a compiler, because the target language is the same as the source.

For a JavaScript compiler (or VM) to be genuinely described as self-hosting, it would need to be able to run using itself, without depending on an existing implementation such as V8, ChakraCore etc. The hard part is not outputting code that can be evaluated by JS itself, but implementing the semantics of JS in terms of a lower-level of abstraction, ideally native code.