I got the following error in the IE11 console from a fresh Angular 4 project.
SCRIPT5007: Unable to get property 'apply' of undefined or null reference File: vendor.js, Line: 33893, Column: 5

I saw this in another project I was developing and tried to come back to the base to see if it was something I introduced myself.

Steps to reproduce:

1. Create new .netcore 2.0 project
2. Select Angular template
3. Build/Run project
4. Open in IE 11 - You will need to open the developer tools and then refresh the page to see the error.

I tried adding a polyfill.ts in the other project I am working on with core-js shim imports but I get almost the same error but it points to Object.assign.

Any ideas?