How to execute CSSO command line CSS minifier on node.js

Question

How to execute CSSO command line CSS minifier on node.js

I'm trying to use CSSO command line on node.js.

Sadly, I can't understand how to just be able of call csso command.

Check this page for CSSO's documentation: https://github.com/css/csso#33-from-the-command-line

I've followed documentation page's steps downloading CSSO using NPM. And it's already installed because I can do a require("csso").justDoIt("....."), but this isn't fine for me, because I need to execute it in a command line since I require this CSS minifier during some Visual Studio build process.

Note that a solution wouldn't be use other compressor, because I've tried YUI, AjaxMin and other ones having command line interfaces, and those don't merge duplicated classes, identifiers and selectors into a single one.

Thank you in advance!!!

windows
node.js
command-line

Answer 1

The csso file in the bin folder basically just calls the /csso/lib/csso.js file, so you should be able to patch your requirements around something like;

node /path/to/csso/lib/csso.js -i -o

Untested, it may require some working of variables but that should get you started on a solution!

Answer 2

use node's child process

var spawn = require('child_process').spawn,
csso  = spawn('csso/bin/csso', ['test.css']);

csso.stdout.on('data', function (data) {
  console.log('stdout: ' + data);
});