There were a couple small bug fixes in the splitGroupsRecursivelyAsync() function. Thank you to Jack for making me aware of the issue as it has now been corrected.
The CDN to the latest versioned instance of the library:
https://cdn.jsdelivr.net/npm/easyews/easyEws1.0.19.js
Here is a link to my GitHub:
https://github.com/davecra/easyEWS
And it is also able to be installed from NPM with the command:
npm install easyews