webpack.config.dev.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
	mode: 'development',
  devtool: 'source-map',
  entry: [
    'webpack-hot-middleware/client',
    path.join(__dirname, '/client/index.js')
  ],
  output: {
    path: path.join(__dirname, "dist"),
    filename: "bundle.js",
    publicPath: '/',
    globalObject: 'this'
  },
  plugins: [
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        include: [
          path.join(__dirname, 'client'),
          path.join(__dirname, 'shared')
        ],
        use: [ 'react-hot-loader/webpack', 'babel-loader' ]
      },
      {
        test: /\.scss$/,
        use: [{
          loader: "style-loader" // creates style nodes from JS strings
        }, {
          loader: "css-loader" // translates CSS into CommonJS
        }, {
          loader: "sass-loader",
          options: {
            includePaths: ["client/styles"]
          } // compiles Sass to CSS
        }]
      },
      {
        test: /\.css$/,
        use: [{
          loader: "style-loader" // creates style nodes from JS strings
        }, {
          loader: "css-loader" // translates CSS into CommonJS
        }]
      }
    ]
  },
  resolve: {
    extensions: [ '*', '.js' ]
  }
};