don't need additional customization, you might want to go with `minify`.
Example:
- // see "fromString" below if you need to pass code instead of file name
var result = UglifyJS.minify("/path/to/file.js");
console.log(result.code); // minified output
+ // if you need to pass code instead of file name
+ var result = UglifyJS.minify("var b = function () {};", {fromString: true});
You can also compress multiple files: