I gave a talk today about some compiler things to some compiler people, and just posted a recording (https://vimeo.com/1234257957) and slides (https://cfallin.org/pubs/vmil2026_nightmonkey_slides.pdf).
In brief: I made JavaScript-running-in-a-Wasm-module go way way faster by building a static type inference and AOT compiler, now dubbed "NightMonkey". It's been tons of fun!
(the "why?!" is covered in the first part of the talk -- certainly a unique set of requirements but IMHO it's well-motivated for our niche)