tessa is a user on toot.cat. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
I'm starting to think that JavaScript is just an elaborate practical joke gone horribly wrong:
https://www.reddit.com/r/programming/comments/87pav8/isthirteen_npm_package_to_check_if_a_number_is/
@craigmaloney what was your first clue