If you design your app to use Closure from the start, it's not a problem at all, and as a sibling comment said, CLJS apps get it mostly for free. The entire JS

If you design your app to use Closure from the start, it's not a problem at all, and as a sibling comment said, CLJS apps get it mostly for free. The entire JS toolchain lost five to ten years by not adopting Closure. I suspect that in a year or two, someone will release a webpack plugin that does the exact same thing Closure did, with the exact same constraints.