That's a good thing. We spend too much time developing languages instead of environments. Unity is a good environment for developing games. If your goal is to

That's a good thing. We spend too much time developing languages instead of environments. Unity is a good environment for developing games. If your goal is to make a game you should use Unity (or whatever... GameMaker has an HTML5 export module; use that). Javascript has nothing to offer you to enhance your productivity and develop your game.