Having trouble building my Angular 2 app with Angular-cli beta 14, despite it working perfectly fine with systemjs beforeEach

I have been using VSCode on Windows 10 to work on an app developed in Angular 2 final version, which runs smoothly with systemjs. Recently, I upgraded to angular-cli beta 14 webpack version and followed the steps outlined in the upgrade document here.

However, I encountered a series of errors stating that it couldn't find essential elements like Map, Require, Promise, among others. Here is a snippet of the errors:

ERROR in [default] E:\development\ketogeniqweb\node_modules\@angular\compiler\src\compile_metadata.d.ts:348:14
Cannot find name 'Set'.

Package.json snippet:

{
  "name": "migration-project",
  "version": "0.0.0",
  // More JSON data here...
}

My project fails to build under the beta14 cli environment and I am struggling to resolve this issue despite trying various fixes suggested by other users. It seems the solutions provided elsewhere do not apply to my specific case. Any guidance on how to overcome this hurdle would be greatly appreciated.

angulartypescript

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