textscroll | Auto-scroll file and console command output

Like Andy mentioned in the comments, you don't want to use useState for animations like this. If you already have the code for this feature without React, you can mostly use it in your React code as well. Except that you want to use useRef to create a reference to the elements you want to animate.

Also, don't forget to clean up your event listener after the component unmounts.

The error you have is because you didn't assign a value to it (even tho you said):

exception NameError: Raised when a local or global name is not found. This applies only to unqualified names. The associated value is an error message that includes the name that could not be found.

Source: https://docs.python.org/3/library/exceptions.html#bltin-exceptions

The problem in your code is that you are trying to access variables from one file without importing them. Global variables only exist inside the file they are defined. Just import them like they were functions: