How to force SASS to merge external css files?
//these two files will not merged
@import "js/font-awesome/css/font-awesome.css";
@import "js/selectize/css/selectize.css";
//thess two files will be merged
@import "js/font-awesome/css/x.scss";
@import "js/selectize/css/y.scss";
I do not want to rename foo.css to foo.sass.