Not to be "that guy", but could you please put the language in the title when posting stuff like this? We all have our language preferences, and I'd rather not have to go digging just to figure out if a project is relevant to me.
It says it's a "web framework" in the title. That generally means it's going to have some kind of templating system, plus html, css, JavaScript, and probably support for other things like markdown and json. Which of these did you want in the title?
Or if you mean what was astro itself written in, I think this post is aimed at users of the system, not potential contributors. Personally I dislike it when when a post says something like "Hugo, a static site generator (Golang)" because it incorrectly implies you need to write Go in order to develop with it.
When I see "web framework" I think Phoenix, Django, Spring, etc. Which do all require you to write in the associated language. If you said "Static Site Generator" then yes that doesn't imply you need write in a specific language.
