A long time ago when I was a full-stack developer, my opinion was that the Closure compiler with its advanced optimizations was so worthwhile that I was willing

A long time ago when I was a full-stack developer, my opinion was that the Closure compiler with its advanced optimizations was so worthwhile that I was willing to change my code style to make it work. That includes not using new JS features not supported by the compiler. But then again my introduction to JS was Douglas Crockford's JavaScript: The Good Parts and I write a lot of C++ so I'm always content with the idea of using only a subset of the language.