Angular Github repo fails on dependency injection

[CobusKruger]

I've seen a few similar issues, with different error messages.

I have a simple Angular application that builds and runs locally (even with AOT), but fails in StackBlitz.

Here is the repo:
https://github.com/CobusKruger/Demo-Observables-Subscriptions

The error message I get is:

Error in /turbo_modules/@angular/compiler@8.2.2/bundles/compiler.umd.js (2603:21)
Can't resolve all parameters for SubscribeUnsubscribeComponent: (?).

The component constructor takes one parameter, which is a service that is part of the repo, using the new Angular providedIn syntax:

@Injectable({
  providedIn: 'root'
})
export class PrimeService {
//
}

This is similar to the errors one gets with ng test when you don't specifically create and supply the objects to inject, so it looks like dependency injection is broken.

My googling showed that many people have (had?) a similar problem, but the error message was always for parameters to ApplicationModule. The fix for that is ostensibly to install core-js@2.6.9 (other versions cause other problems) and import core-js/es7/reflect into polyfils.ts, but that just gets me stuck in a loop where StackBlitz cannot find core-js, installs it, cannot find it, installs it, etc.

[kc0tlh]

This issue is now resolved in our new VS Code editor! Additional details in Github issue #2473

Check it out for yourself here: https://pr.new/github.com/CobusKruger/Demo-Observables-Subscriptions