I am migrating a page from pages router to the new app router, so I just moved and renamed the file. This is when the error was expected and did first show up.
However, after a bit of working, I suddenly don't receive the errors any more.
What made the errors appear in the first place?
Is it some extension or configuration?
How can I get them back?
Note that I have a next dev command running and I do get these errors in the console still, just not in the VSCode IDE.