code-splitting vs tree-shaking

index.js

import React from 'react';
import ReactDom from 'react-dom';
import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider';
import TextField from 'material-ui/TextField';

const App = () => (
  <MuiThemeProvider>
    <TextField hintText="my cool hint text" />
  </MuiThemeProvider>
);

ReactDom.render(<App />, document.body);

package.json

{
  "name": "splitting-vs-shaking",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {
    "material-ui": "^0.17.0",
    "react": "^15.4.2",
    "react-dom": "^15.4.2"
  },
  "devDependencies": {
    "babel-core": "^6.23.1",
    "babel-loader": "^6.3.2",
    "babel-preset-es2015": "^6.22.0",
    "babel-preset-react": "^6.23.0",
    "html-webpack-plugin": "^2.28.0",
    "webpack": "^2.2.1"
  },
  "scripts": {
    "build:splitting": "webpack --config webpack.splitting.js",
    "build:bundle": "webpack --config webpack.bundle.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

webpack.bundle.js

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

module.exports = {
  entry: {
    app: './src/index.js',
  },
  output: { filename: 'bundle.js', path: 'dist-bundle' },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: { 
          presets: [ 
            [ 'es2015', { modules: false } ],
            'react',
          ] 
        }
      }
    ]
  },
  plugins: [ 
    new HtmlWebpackPlugin({ title: 'bundle' }),
  ],
}

webpack.splitting.js

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

module.exports = {
  entry: {
    app: './src/index.js',
    react: ['react', 'react-dom', 'material-ui'],
  },
  output: { filename: '[name].js', path: 'dist-splitting' },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: { 
          presets: [ 
            [ 'es2015', { modules: false } ],
            'react',
          ] 
        }
      }
    ]
  },
  plugins: [ 
    new HtmlWebpackPlugin({ title: 'splitting' }),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'react'
    }),
  ],
}