Build SCSS with the `node-sass` npm module

build-scss.js

// npm install node-sass

var fs = require('fs'),
    sass = require('node-sass');
    
// specify in-/output files
var inFile  = '/path/to/main.scss',
    outFile = '/path/to/main.css';

sass.render(
{
    file: inFile,
    outputStyle: 'nested' // can also be 'expanded', 'compact' or 'compressed'
},
function (err, res)
{
    if (err) { return console.error("Couldn't render", err); }

    fs.writeFile(outFile, res.css.toString(), function (err)
    {
        if (err) { return console.error("Couldn't write to disk", err); }

        console.log("done");
    });
});