The BrightWork product runs in SharePoint where we have 3 Visual Studio solutions, one of which contains just the client scripts.
My initials testing is in a simple VS empty web project. I added ej2 using NuGet and added a tsconfig ( target: es2015 ) to build a Gantt page. This works in Edge, Chrome, Firefox & Brave. But fails on MS Internet Explorer ( which is the recommended browser for SharePoint ).
I took a step back and wrote a simple page to execute a window.alert only and cannot get this to work in IE.
Your online & local demos work file, what am I missing? How do I get this working on Internet Explorer?