webpack.config.dev.js

const webpack = require('webpack');
const cssnext = require('postcss-cssnext');
const postcssFocus = require('postcss-focus');
const postcssReporter = require('postcss-reporter');

const path = require('path');
const fs  = require('fs');
const lessToJs = require('less-vars-to-js');
const themeVariables = lessToJs(fs.readFileSync(path.join(__dirname, './client/css/theme.less'), 'utf8'));
console.log("loading webpack.config.dev.js");  

module.exports = {
  devtool: 'cheap-module-eval-source-map',

  entry: {
    app: [
      'eventsource-polyfill',
      'webpack-hot-middleware/client',
      'webpack/hot/only-dev-server',
      'react-hot-loader/patch',
      './client/index.js',
    ],
    vendor: [
      'react',
      'react-dom',
    ],
  },

  output: {
    path: __dirname,
    filename: 'app.js',
    publicPath: 'http://0.0.0.0:8000/',
  },

  resolve: {
    extensions: ['.js', '.jsx'],
    modules: [
      'client',
      'node_modules',
    ],
  },

  module: {
    rules: [
      {
        test: /\.s?css$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: {
              localIdentName: '[name]__[local]__[hash:base64:5]',
              modules: true,
              importLoaders: 1,
              sourceMap: true,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              plugins: () => [
                postcssFocus(),
                cssnext({
                  browsers: ['last 2 versions', 'IE > 10'],
                }),
                postcssReporter({
                  clearMessages: true,
                }),
              ],
            },
          },
        ],
      },
      {
        test: /\.css$/,
        include: /node_modules/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.less$/,
        use: [
          {loader: "style-loader"},
          {loader: "css-loader"},
          {loader: "less-loader",
            options: {
              modifyVars: themeVariables,
              root: path.resolve(__dirname, './'),
              javascriptEnabled: true
            }
          }
        ]
      },
      {
        test: /\.jsx*$/,
        exclude: [/node_modules/, /.+\.config.js/],
        use: [ 
          {
            loader: 'babel-loader',
            options: {
            }
          }
        ]
      },
      {
        test: /\.(jpe?g|gif|png|svg)$/i,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 10000,
            },
          },
        ],
      },
      {
        test: /\.(txt|md)$/i,
        use: 'raw-loader',
      },
    ],
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks: Infinity,
      filename: 'vendor.js',
    }),
    new webpack.DefinePlugin({
      'process.env': {
        CLIENT: JSON.stringify(true),
        'NODE_ENV': JSON.stringify('development'),
      }
    }),
  ],
};