Is it possible to minify a single JS file using the Sencha SDK ?

I need to incluse an external file in my app and id like to compress it using the already installed toolchain.

I tried various SDK commands with no luck with v3.0.0.250

Code:
sencha fs minify -from cms/extjs/js/config.js -to cms/extjs/js/config-min.js --compressor closurecompiler
Code:
sencha fs minify cms/extjs/js/config.js cms/extjs/js/config.min.js
Nothing gets created though. Any idea ?