Minify js/css only if .min exists

[Valkhan]

There are some cases, react, that we don't need to minify every js file, só an option to minify only if there's already a minified file is ery much needed.

You could use this deprecated extension as reference: https://github.com/olback/es6-css-minify

[CaffeineOnIce]

I apologise, but I'm really occupied, due to entrance exams. But I'll look into it still. But chances are low until February.