Concat and minify JS files in Node

Question

Is there any module in NodeJS to concatenate and minify JavaScript files?

Answer 1

If you already have uglify-js, your code uses some of the latest ES6 features (ECMAScript 2015) and it just gave you back parse errors on the first run, then install uglify-es:

npm install uglify-es -g

Or:

npm install mishoo/UglifyJS2#harmony

The explanation is in uglify-js-es6 package:

This is a temporary package containing the latest release of the 'harmony' branch of uglifyjs (UglifyJS2).

You can still run it normally with the uglifyjs command. A compress and mangle example:

uglifyjs -c -m -o js/es6stuff.js -- js/es6stuff/*.js

Which will produce a single file with all the JS files of a folder. The double dash (--) just prevents input files being used as option arguments.