webpack.config.js

const webpack = require('webpack');
const { resolve } = require('path');
const Dotenv = require('dotenv-webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {

  entry: [
    'react-hot-loader/patch',
    'webpack-dev-server/client?http://localhost:8080',
    'webpack/hot/only-dev-server',
    resolve(__dirname, 'src', 'index.jsx')
  ],

  output: {
    filename: 'app.bundle.js',
    path: resolve(__dirname, 'build'),
    publicPath: '/'
  },

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

  devtool: '#source-map',

  devServer: {
    hot: true,
    contentBase: resolve(__dirname, 'build'),
    publicPath: '/'
  },

  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.jsx?$/,
        enforce: 'pre',
        loader: 'eslint-loader',
        exclude: /node_modules/,
        options: {
          emitWarning: true,
          configFile: './.eslintrc.json'
        }
      },
      {
        test: /\.jsx?$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        options: {
          presets: [
            ['es2015', { 'modules': false }],
            'react', 'stage-0'
          ],
          plugins: [
            'react-hot-loader/babel'
          ]
        }
      },
      {
        test: /\.(png|gif|jp(e*)g|svg)$/,
        use: {
          loader: 'url-loader',
          options: {
            limit: 8000,
            name: 'images/[hash]-[name].[ext]'
          }
        }
      }
    ],
  },

  plugins: [
    new Dotenv({
      systemvars: true
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NamedModulesPlugin(),
    new HtmlWebpackPlugin({
      template: 'template.ejs',
      appMountId: 'react-app-root',
      title: 'Bike and Transit Planner',
      filename: resolve(__dirname, 'build', 'index.html'),
    }),
  ]
};