The performance of JS these days, for such a dynamic language, is actually very impressive. If Java were our only option I assure you we'd have come up with al

The performance of JS these days, for such a dynamic language, is actually very impressive. If Java were our only option I assure you we'd have come up with all kinds of crazy alternative systems of doing things. Plus, targeting the JVM for weird transpiled language was what all of the cool kids did before doing it in JS became cool. This isn't unique to JS. It's probably unique to any language with that much adoption.