I’m not familiar with haXe all that well, just enough to include it in the list. However, in the end haXe is too, statically translated into Javascript. GWT has

I’m not familiar with haXe all that well, just enough to include it in the list. However, in the end haXe is too, statically translated into Javascript. GWT has an excellent debugger as well, but there’s only so much you can do on that level of indirection.