This is interesting both because it is impressive and also because it isn’t.
Crazy that an LLM can even pull it off.
But interesting that the performance jump is pretty modest, ~1.6x is pretty modest considering the effort. Only an order of magnitude over ts6 (same as ts7).
Announcing tsc-rs (aka ts-rust), my complete rewrite of the Typescript compiler, type checker, and LSP, all in Rust.
This is a project I've had agents working on for 5 months now. I burned ~$400k of Codex tokens and got nowhere. Burned ~$20k of Opus and got there in 2 weeks.
I have not read a single line of the code.
tsc-rs is an open source drop-in replacement for tsc, and it's available now.