Interesting ideas, very different, but still reminds me a lot of Light Table (probably because they have the same author :p) Seems to be built on a rather interesting Rust + TypeScript stack? Can't say I've seen that one before - anyone have experience with such a stack?
The stack choice is especially interesting since I thought they were big fans of Clojure. I would like to hear their rationale for Rust/TypeScript over Clojure/ClojureScript (or Clojure/Javascript). EDIT: typo
@mej10: Turn on showdead if you want to see jamii's response to your question.