I've been wondering this as well. I maintain a large enterprise app and some former dev's used `ThisThat.js` and `SomethingNewThisWeek.js` to accomplish a few h

I've been wondering this as well. I maintain a large enterprise app and some former dev's used `ThisThat.js` and `SomethingNewThisWeek.js` to accomplish a few hacks, but low and behold a few years later and they are all EOL and breaking, not to mention many cannot be upgraded because they are so amateur they don't use namespaces and conflict. The many sites are going to be bit in a few years when the recent JS Explosion of new libraries wanes and we've got 1000 unsupported JS libraries out there and you're having to tell the department head the whole app UI has to be written, again, to keep up with that zag no one saw coming with the web. For this reason I love Google Web Toolkit(I've done the ExtJs/Bootstrap/YUI/JQueryUI thing too) as it's totally open source, community driven, Google backed, and still going strong with releases and community support 8 years later. The beauty is with Maven, I just increment the framework version number and I get all those new compiler optimizations, IE versionX++ and Blink support for free. As long as JS remains a shell of a language, I think compiling down to JS is the most sensible approach (i.e. Typescript/Dart/ASM.js/GWT) rather than having to fight the vagaries of torturing another trick from JS. Use a framework in a high level language that makes your life easier and future proof. Of course, one day ECMAScript might really become a serious language, but then I'll just update my GWT compiler and take advantage of that with a recompile.