react-data-grid-addons breaks minification in production build

[carbonrobot]

Which version of React JS are you using?

✅ Officially supported ✅

• [ ] v15.4.x

⚠️ Not officially supported, expect warnings ⚠️

• [ ] v15.5.x
• [ ] v15.6.x

☣️ Not officially supported, expect warnings and errors ☣️

• [x ] v16.x.x

---

Which browser are you using?

✅ Officially supported ✅

• [ ] IE 9 / IE 10 / IE 11
• [ ] Edge
• [x ] Chrome

⚠️ Not officially supported, but "should work" ⚠️

• [ ] Firefox
• [ ] Safari

---

I'm submitting a ...

• [x ] 🐛 Bug Report
• [ ] 💡 Feature Request

👋 Need general support? Not sure about how to use React itself, or how to get started with the Grid? Please do not submit support request here. Instead see

https://github.com/adazzle/react-data-grid/blob/master/CONTRIBUTING.md

---

Issue Details

The react-data-grid-addons module fails to minify in a production build of create-react-app or plain webpack build.

Error in browser console:

react-data-grid-addons.js:2182 Uncaught TypeError: Super expression must either be null or a function, not undefined
    at react-data-grid-addons.js:2182

Steps to reproduce:

$ create-react-app gridtest
$ cd gridtest
$ npm install react-data-grid react-data-grid-addons immutable
$ npm start

• Paste the following code in the App.js file.

import React, { Component } from 'react';
import ReactDataGrid from 'react-data-grid';
import { Toolbar } from 'react-data-grid-addons';

const columns = [{ key: 'id', name: 'ID' }, { key: 'title', name: 'Title' }, { key: 'count', name: 'Count' }];
const rows = [{ id: 0, title: 'row1', count: 20 }, { id: 1, title: 'row1', count: 40 }, { id: 2, title: 'row1', count: 60 }];

class App extends Component {
  render() {
    return (
      <div className="App">
        <ReactDataGrid columns={columns} rowGetter={i => rows[i]} rowsCount={3} minHeight={150} toolbar={Toolbar} />
      </div>
    );
  }
}
export default App;

• Open browser and confirm the application works normally
• Stop the application, and create a production build

$ npm run build
$ npm install -g serve
$ serve -s build

• Open browser and confirm the application is broken with error in in console.

[slonix]

I have the same problem as @carbonrobot in my production app. The sample above also breaks. The app works in development but breaks on production build. I am using react@16.8.4.

[parthiv1993]

I am also facing the same error.

[Hewlbern]

Same issue