Convert rem units to pixels

gistfile1.js

var glob = require('glob');
var _ = require('lodash');
var fs = require('fs');

var rem = 18;
var path = '/path/stuff/**/*.css';

glob(path, {}, function(err, files) {
  _.each(files, function(file) {
    fs.readFile(file, 'utf-8', function(err, data) {
      var converted = data.replace(/(\d+.?\d*)rem/g, function(match, p1) {
        return Math.floor(p1 * rem) + 'px';
      });

      fs.writeFile(file, converted, function(err) {
        console.log('converted ' + file);
      });
    });
  });
});