Getting an warning of using 'eval'

I am getting an warning from the rollup code 

```
rollup: Use of `eval` (in /node_modules/collectionsjs/dist/collection.js) is strongly 
            discouraged, as it poses security risks and may cause issues with minification. See 
            https://github.com/rollup/rollup/wiki/Troubleshooting#avoiding-eval for more details 
```
