[jez]

Out of curiosity, do you have experience with other languages that have type system plugins that you’d hope be used as inspiration for something in Python?

I don’t have any such experience (short of a macro system, which requires code generation or runtime support) and it always makes me curious when people ask for type system plugins whether this is a standard feature in a type system I’ve never used.

[dcreager]

To add to the complexity, you have to worry about not just which language you're analyzing, but also which language the type-checker is implemented in.

So if we were to do this for ty, we would have to carefully design the internal data types and algorithms that we use to model Python code, so that they're extensible in a robust way.

But we would also have to decide what kind of Rust plugin architecture to use. (Embed a Lua interpreter? dlopen plugins at runtime? Sidecar process communication over stdin/stdout?)

Solvable problems, to be sure, but it adds to the amount of work that's needed to support this well — which in turn affects our decisions about whether/when to prioritize this relative to other features.

[badmintonbaseba]

Isn't mypy extensible with plugins?