Your code is using Angular 19+ APIs, but your app is on Angular 17.

RenderMode and ServerRoute (from @angular/ssr) were introduced with Angular’s hybrid rendering / route-level render modes in v19. They do not exist in v17, so VS Code correctly reports it as no exported member.

How to fix this:

1. Upgrade to Angular 19+ (CLI and framework must match)
   Do Verify @angular/ssr is also v19+ in package.json.

2. After updating, your imports are valid

3. If the editor still underlines types, restart the TS server in VS Code (Command Palette -> “Developer: Restart TypeScript Server”).

   If you dont want to upgrade now remove those imports and use the legacy SSR pattern on v17.