We relied on Closure Compiler for years, but we're now moving off it to ESBuild + UglifyJS. Closure has the most advanced minification, but these days it's not

We relied on Closure Compiler for years, but we're now moving off it to ESBuild + UglifyJS. Closure has the most advanced minification, but these days it's not well maintained - it's lacking support for modern JavaScript features like dynamic imports and private fields, it's not clear when or if any of that will be supported, releases have reduced to every ~6 months, and all too often if you file a bug the response is "this doesn't affect Google, tough luck". So unfortunately despite having the best minification I can't recommend it any more - it's basically a Google-internal project that happens to be on GitHub. UglifyJS looks like a better option these days.