After updating my Angular version from 7.X to 8.2.5, everything seemed fine until I started getting errors related to the rxjs module within the angular/core package. Despite having the latest version of rxjs (6.5.3), the errors persisted even after removing rxjs-compat. Here's a snippet of the error message:
ERROR in ../../../../../node_modules/@angular/core/src/application_ref.d.ts:8:28 - error TS2307: Cannot find module 'rxjs'.
8 import { Observable } from 'rxjs';
~~~~~~
...
I tried re-installing npm packages and checking my dependencies listed in package.json, but the issue remained unresolved. However, my application continued to function despite these errors cropping up during compilation.
If you're facing a similar problem, make sure to double-check your project's directory structure for any unexpected node_modules directories that might be causing conflicts. In my case, I found one such rogue directory outside of my project's main folder which was triggering these errors.
Once I removed this rogue node_modules directory, the errors disappeared, and my application compiled without any issues. So if you're struggling with the same error message post-update, it might be worth investigating any stray node modules cluttering your file system!