Sorry I meant as in an older version of a library that an app has been built on and hasn't been updated or maintained for a few months. I should have put that

Sorry I meant as in an older version of a library that an app has been built on and hasn't been updated or maintained for a few months. I should have put that better, the libraries themselves are not deprecated, their dependencies can be. While this negligence problem would be on the fault of the dev team and management for not doing regular package updates it is an all too common issue in many companies. What I am saying is that bad typescript is harder to fix than bad javascript because type errors compound the problems of convoluted code.