webpack.config.dev.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const env = process.env.NODE_ENV || 'development';

module.exports = {
  entry: [
    'babel-polyfill',
    'react-hot-loader/patch',
    'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=20000',

    './src/index.js',
    // the entry point of our app
  ],

  output: {
    filename: '[name].js',
    // the output bundle

    path: path.resolve(__dirname, 'dist'),

    publicPath: '/static/',
    // necessary for HMR to know where to load the hot update chunks
  },

  resolve: {
    extensions: ['.js'],
    modules: [path.resolve(__dirname, 'src/'), 'node_modules'],
    alias: {
      components: path.resolve(__dirname, 'src/components'),
      forerunnerdb: path.resolve(__dirname, 'node_modules/forerunnerdb/js/builds/all.js'),
    },
  },

  devtool: 'cheap-source-map',

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        use: ['babel-loader'],
        exclude: /node_modules/,
      },
      {
        test: /\.scss$/,
        use: [
          {
            loader: 'style-loader', // creates style nodes from JS strings
          },
          {
            loader: 'css-loader',
            options: {
              sourceMap: true,
            },
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
              includePaths: [path.resolve(__dirname, 'src', 'styles')],
            },
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
          },
        ],
      },
      {
        test: require.resolve('react-addons-perf'),
        use: 'expose-loader?Perf',
      },
    ],
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    // enable HMR globally

    new webpack.NamedModulesPlugin(),
    // prints more readable module names in the browser console on HMR updates

    new webpack.NoEmitOnErrorsPlugin(),
    // do not emit compiled assets that include errors
    new webpack.ProvidePlugin({
      autobind: 'autobind-decorator',
    }),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(env),
      },
    }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks: module => module.context && module.context.indexOf('node_modules') !== -1,
    }),
    new HtmlWebpackPlugin({
      template: './index.html',
      inject: 'body',
      filename: 'index.html',
    }),
  ],

  devServer: {
    host: 'localhost',
    port: 3000,

    historyApiFallback: true,
    // respond to 404s with index.html

    hot: true,
    // enable HMR on the server
  },
};