CodeMirror.commands undefined when importing package

I'm submitting a...
- [x] Bug report
- [ ] Feature request

### Reproduction steps
1. Install package `npm install --save easymde`
2. Use webpack to bundle your js and point it to an entrypoint javascript file.
3. Import it in your JS file `import "easymde"` or `import { EasyMDE } from "easymde"` or `import * as EasyMDE from "easymde"`
4. Visit page that JS is loaded, it will say `CodeMirror.commands is undefined` in browser console.

If I import the minified js file (see below) it works fine, so I guess the issue is related to the bundling, perhaps some dependency or something that have to be set in the webpack config file that is not specified?

```
const EasyMDE = require('easymde/dist/easymde.min.js');
```

### Version information
Browser type and version: Chrome/Firefox
EasyMDE version: 2.4.2