webpack.config.js

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

var BUILD_DIR = path.resolve(__dirname, 'assets');
var APP_DIR = path.resolve(__dirname, 'src/js');

module.exports = {
  entry: [
    'webpack-dev-server/client?http://localhost:8080', // WebpackDevServer host and port
    'webpack/hot/only-dev-server', // "only" prevents reload on syntax errors
    APP_DIR + '/index.js'
  ],
  output: {
    path: BUILD_DIR,
    publicPath: '/',
    filename: 'lunchify.js'
  },
  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),    //<--   to generate hot update chunk
    new HtmlWebpackPlugin({
      template: './index.html',
      inject: true
    })
  ],
  module: {
    loaders: [
      {
        test: /\.js?$/,
        loaders: ['babel'],
        exclude: /node_modules/
      },
      {
        test: /\.js$/,
        loaders: ['babel'],
        exclude: /node_modules/,
        include: path.join(__dirname, '..', '..', 'src')
      },
      {
        test: /\.scss$/,
        loader: ["style", "css", "sass"]
      }]
  },
  devServer: {
    hot: true,  //  <-- enable HMR in webpack dev server and lib running in the browser
    contentBase: './'
  }
};