webpack.config.js

const path = require('path');
const webpack = require('webpack');
const nodeExternals = require('webpack-node-externals');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const nodeEnv = process.env.NODE_ENV || 'development';
const outputDirectory = 'dist';
const hotMiddlewareScript = 'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=20000';

const common = {
  mode: nodeEnv,
  devtool: 'inline-source-map',
  resolve: {
    alias: {
      '@client': path.resolve(__dirname, 'client'),
      '@server': path.resolve(__dirname, 'server'),
      '@common': path.resolve(__dirname, 'common'),
      '@atom': path.resolve(__dirname, 'client/components/atoms'),
      '@molecule': path.resolve(__dirname, 'client/components/molecules'),
      '@organism': path.resolve(__dirname, 'client/components/organisms'),
      '@template': path.resolve(__dirname, 'client/components/templates'),
    }
  }
};

const frontend = {
  entry: {
    bundle: [ './client/index.js', hotMiddlewareScript ]
  },
  output: {
    path: path.resolve(__dirname, outputDirectory + '/public'),
    filename: '[name].js',
    publicPath: 'http://localhost:8181/',
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {NODE_ENV: JSON.stringify(nodeEnv)},
    }),
    new webpack.HotModuleReplacementPlugin(),
  ],
  module: {
    rules: [
      {
        test: /\.js?$/,
        exclude: [/node_modules/],
        use: ['babel-loader'],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[ext]'
            }
          }
        ]
      }
    ]
  }
};

const backend = {
  entry: {
    server: './server/server.js',
  },
  target: 'node',
  externals: [
    nodeExternals({whitelist: hotMiddlewareScript}),
  ],
  output: {
    path: path.resolve(__dirname, outputDirectory),
    filename: '[name].js',
    publicPath: '/',
  },
  node: {
    __dirname: true,
  },
  plugins: [
    new CleanWebpackPlugin(outputDirectory),
    new webpack.DefinePlugin({
      'process.env': {NODE_ENV: JSON.stringify(nodeEnv)},
    }),
    new webpack.HotModuleReplacementPlugin(),
  ],
  module: {
    rules: [
      {
        test: /\.js?$/,
        exclude: [/node_modules/],
        use: ['babel-loader'],
      }
    ]
  }
};

module.exports = [
  Object.assign({}, common, frontend),
  Object.assign({}, common, backend),
];