Simon Willison’s Weblog

We’re building a new static type checker for Python, from scratch, in Rust. From a technical perspective, it’s probably our most ambitious project yet. We’re about 800 PRs deep!

Like Ruff and uv, there will be a significant focus on performance. The entire system is designed to be highly incremental so that it can eventually power a language server (e.g., only re-analyze affected files on code change). [...]

We haven't publicized it to-date, but all of this work has been happening in the open, in the Ruff repository.

— Charlie Marsh