trying to include buttons

_common.webpack.config

var ExtractTextPlugin = require("extract-text-webpack-plugin");
var debug = require('debug')('webpack--common');
var fs = require('fs');
var _ = require('lodash');
var cssstats = require('postcss-cssstats');
var loaders = require('./_commonLoaders');

/* Dux Button Config */
var elementButton = require('@dux/element-button/defaults');
var buttons = elementButton.mkButtons([{
  name: 'primary',
  color: '#FFF',
  bg: '#22B8EB'
},{
  name: 'secondary',
  color: '#FFF',
  bg: '#232C37'
},{
  name: 'coral',
  color: '#FFF',
  bg: '#FF85AF'
},{
  name: 'success',
  color: '#FFF',
  bg: '#0FD85A'
},{
  name: 'warning',
  color: '#FFF',
  bg: '#FF8546'
},{
  name: 'yellow',
  color: '#FFF',
  bg: '#FFDE50'
},{
  name: 'alert',
  color: '#FFF',
  bg: '#EB3E46'
}]);
/**
 * cssnaneOpts can be true or an options object
 * 
 * http://cssnano.co/options/
 */
var cssnanoOpts = {
  merge: false
};
var postCSSImportOpts = true;
module.exports = {
  resolve: {
    extensions: ['', '.js', '.jsx', '.json'],
    root: [
    '/opt/hub/app/scripts/',
    '/opt/hub/app/scripts/components'
    ]
  },
  module: {
    preLoaders: loaders.preLoaders,
    loaders: loaders.commonLoaders
  },
  postcss: [
    require('postcss-constants')({
      defaults: _.merge(require('@dux/element-card/defaults')({}),
        duxElementButton: {
          radius: '.25rem',
          buttons: buttons
        })
    }),
    require('cssnext')({
      browsers: 'last 2 versions',
        import: postCSSImportOpts,
        compress: cssnanoOpts,
        messages: false,
        plugins: [
            require('postcss-constants')({
                defaults: _.merge(require('@dux/element-card/defaults')({}),
                  duxElementButton: {
                    radius: '.25rem',
                    buttons: buttons
                  })
            }),
            require('postcss-nested'),
            cssstats(function(stats) {
          /**
           * this cssstats callback runs for every postcss file
           * perhaps we want to write out this object and
           * record the values over time?
           * 
           * problem: there is no filename here
           */
          debug(stats);
        })]
    })
  ],
  eslint: {
    failOnError: true
  },
  bail: true,
  profile: true
}