Nothing is to be known by everybody. But it's surprising that you don't associate typescript with deno. Unless you didn't know about deno in the first place.
Just saying because TS had some kind of popularity these days.
To be fair, there is absolutely zero information about what technology is being used on the page the submission links to. Clicking the top-left icon brings you to "https://dash.deno.com/projects" which then forces you to login, still not giving any indication on what this thing is about or even written in.
I can see how you can get confused, even if I wasn't as I'm around the JS community.