The requested module '@kwsites/file-exists' does not provide an export named 'FOLDER'

I get this error while using your package: 
```
 import { exists, FOLDER } from "@kwsites/file-exists";
 ^^^^^^
 SyntaxError: The requested module '@kwsites/file-exists' does not provide an export named 'FOLDER'
```

For more context, I use `simple-git` on Heroku, and simple-git rely on this package to get some stuff done. 