From Fedora Project Wiki

This page tracks issues related to minification and/or compilation of JavaScript in Fedora.

jsmin

The license used for JSMin is non-free.

uglifyjs

The uglifyjs command, provided by the Package-x-generic-16.pnguglify-js package, may be used for minification. For example:

uglifyjs your.js -c -m -o your.min.js

Google Closure Compiler

The Google Closure Compiler is packaged for F21+.