Extract CSS webpack.config.js

const extractSCSS = new ExtractTextPlugin({
  filename: 'stylesheets/main.css',
  disable: IS_DEV,
  allChunks: true
});

const extractCSS = new ExtractTextPlugin({
  filename: 'stylesheets/vendor.css',
  disable: IS_DEV,
  allChunks: true
});

module.exports = {
  context,
  entry: { main: path.join(__dirname, './src/index.js') },
  output: {
    path: path.resolve(__dirname, './dist'),
    publicPath: '/assets',
    filename: '[name].[chunkhash:4].js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: extractCSS.extract({
          fallback: 'style-loader',
          use: [{ loader: 'css-loader', options: { minimize: !IS_DEV } }, { loader: 'postcss-loader' }]
        })
      },
      {
        test: /\.(scss|sass)$/,
        include: [path.resolve(__dirname, './src/common/'), path.resolve(__dirname, 'node_modules', 'bulma')],
        use: extractSCSS.extract({ fallback: 'style-loader', use: ['css-loader', 'postcss-loader', 'sass-loader'] })
      },
      {
        test: /\.scss$/,
        exclude: [path.resolve(__dirname, './src/common/'), path.resolve(__dirname, 'node_modules', 'bulma')],
        use: extractSCSS.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader',
              options: {
                modules: true,
                importLoaders: 1,
                localIdentName: '[name]__[local]___[hash:base64:5]'
              }
            },
            {
              loader: 'postcss-loader',
              options: {
                sourceMap: true
              }
            },
            {
              loader: 'sass-loader',
              options: {
                includePaths: [path.resolve(__dirname, 'src', 'common')]
              }
            }
          ]
        })
      }
    ]
  },
  plugins: [
    extractSCSS,
    extractCSS,
    new HtmlWebpackPlugin({
      title: 'Form Builder',
      template: path.join(__dirname, '/static/template.html')
    }),
    new CleanWebpackPlugin(['dist'])
  ]
};