Webpack CoffeeScript + PostCSS (SugarSS) + Stylus +

webpack.common.js

const path = require('path')
const rupture = require('rupture')

const isDev = process.argv.indexOf('-p') === -1
let removeNull = array => array.filter(e => e !== null)

module.exports = {
  output: {
    path: path.resolve('./dist'),
    filename: 'bundle.js',
    publicPath: ''
  },
  resolve: {
    extensions: [
      '.coffee',
      '.js',
      '.json',
      isDev ? '.dev.coffee' : '.prod.coffee',
      isDev ? '.dev.js' : '.prod.js',
    ],
    modules: ['node_modules', path.resolve('./src')]
  },
  devtool: 'source-map',
  module: {
    rules: [
      {
        test: /\.js$/,
        include: path.resolve('./src'),
        use: ['babel-loader']
      },
      {
        test: /\.coffee$/,
        include: path.resolve('./src'),
        use: ['babel-loader', 'coffee-loader']
      },
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/,
        include: path.resolve('./src/assets'),
        use: [
          {
            loader: 'file-loader',
            options: isDev
              ? {
                // use full path in development for better readability
                name: '[path][name].[ext]'
              }
              : {
                outputPath: 'assets/'
              }
          }
        ]
      },
      {
        test: /\.(css)$/,
        include: path.resolve('./src'),
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(sss)$/,
        include: path.resolve('./src'),
        use: removeNull([
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              localIdentName: isDev
                ? '[name]_[local]_[hash:base64:3]'
                : '[hash:base64:10]',
              modules: true,
              importLoaders: 1
            }
          },
          isDev ? null : 'postcss-loader',
          {
            loader: 'stylus-loader',
            options: {
              sourceMap: isDev,
              use: [rupture()]
            }
          },
          isDev ? 'postcss-loader?parser=sugarss' : null
        ])
      }
    ]
  },
}

webpack.dev.js

const merge = require('webpack-merge')
const common = require('./webpack.common.js')

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const {
  NamedModulesPlugin,
  HotModuleReplacementPlugin
} = require('webpack')

module.exports = merge(common, {
  entry: ['react-hot-loader/patch', './src/index.dev.coffee'],
  devtool: 'eval',
  devServer: {
    contentBase: path.resolve('./dist'),
    historyApiFallback: true,
    hot: true,
    proxy: {
      '/api': 'http://localhost:3000'
    }
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.resolve('./public/index.html'),
      inject: 'body'
    }),
    new NamedModulesPlugin(),
    new HotModuleReplacementPlugin()
  ]
})

webpack.prod.js

const merge = require('webpack-merge')
const common = require('./webpack.common.js')

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')
const {DefinePlugin} = require('webpack')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

module.exports = merge(common, {
  entry: './src/index.prod.coffee',
  devtool: 'nosources-source-map',
  plugins: [
    new CleanWebpackPlugin(['dist']),
    new HtmlWebpackPlugin({
      template: path.resolve('./public/index.html'),
      inject: 'body',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        conservativeCollapse: true
      }
    }),
    new UglifyJsPlugin,
    new DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('production')
      }
    })
  ]
})