Version 2.0.0 cannot be used with rollup

I'm trying to use file-saver version 2.0.0 with rollup, but I get the following error:

```
(!) Missing exports
https://rollupjs.org/guide/en#error-name-is-not-exported-by-module-
src/ExportCsv.js
saveAs is not exported by node_modules/file-saver/dist/FileSaver.min.js
```
I'm importing it using:

```
import * as FileSaver from 'file-saver';
```
tried also:
```
import { saveAs } from 'file-saver';
```

**Version 1.3.8 works correctly.** I don't understand exactly why.

Any idea?