Anonymised_user_6 lesson learned - use git instead of writing it in a text editor, constantly copy pasting into Custom Extension, and using the web editor to paste that code every liek 1000 gazillion years.
speaking of the web editor do not use it, using it harms your ability to actually code as it does not have linting, testing, dev servers, or a terminal. real devs use an iDE, not “Edit file”.