webpack.config.js

const webpack = require('webpack');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const { resolve } = require('path');
const { mergeWith, concat } = require('ramda');

const autoprefixer = require('autoprefixer');
const precss = require('precss');

const ENV = process.env.NODE_ENV;

const postcssPlugins = [autoprefixer, precss];

const devel = {
  devtool: 'inline-source-map',

  entry: [
    // HMR support
    'react-hot-loader/patch',
    'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=20000',
    'babel-polyfill',

    // entry point
    './src/app/index.js',
  ],


  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          'babel-loader',
        ],
        exclude: /node_modules/,
      },
      {
        test: /(\.global\.css$|react-select.css)/,
        use: [
          { loader: 'style-loader' },
          { loader: 'css-loader' },
          {
            loader: 'postcss-loader',
            options: {
              plugins() {
                return postcssPlugins;
              },
            },
          },
        ],
      },
      {
        test: /^((?!\.global).)*\.css$/,
        use: [
          { loader: 'style-loader' },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              importLoaders: 1,
              sourceMap: true,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              plugins() {
                return postcssPlugins;
              },
            },
          },
        ],
        exclude: /node_modules/,
      },
    ],
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.NamedModulesPlugin(),
  ],
};

const prod = {
  entry: [
    'babel-polyfill',
    './src/app/index.js',
  ],

  module: {
    rules: [
      {
        test: /\.js$/,
        use: [
          'babel-loader',
        ],
        exclude: /node_modules/,
      },
      {
        test: /(\.global\.css$|react-select.css)/,
        use: ExtractTextPlugin.extract([
          { loader: 'css-loader' },
          {
            loader: 'postcss-loader',
            options: {
              plugins() {
                return postcssPlugins;
              },
            },
          },
        ]),
      },
      {
        test: /^((?!\.global).)*\.css$/,
        use: ExtractTextPlugin.extract([
          {
            loader: 'css-loader',
            options: {
              modules: true,
              importLoaders: 1,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              plugins() {
                return postcssPlugins;
              },
            },
          },
        ]),
        exclude: /node_modules/,
      },
    ],
  },

  plugins: [
    new ExtractTextPlugin({ filename: 'bundle.css', disable: false, allChunks: true }),
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        screw_ie8: true,
        warnings: false,
      },
    }),
  ],
};

const base = {
  output: {
    filename: 'bundle.js',
    path: resolve(__dirname, 'public'),
    publicPath: '/',
  },

  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(ENV),
      },
    }),
  ],
};

const config = ENV === 'production' ? prod : devel;

module.exports = mergeWith(concat, base, config);