ezno VS flix

> I'm curious if there are any practical reasons we don't see them implemented in more languages.

I believe it's because they're not exactly easy to implement and the resulting extensive type checking might also affect compiler performance.

By the way, another great example of refinement types (in JavaScript) is this one: https://kaleidawave.github.io/posts/introducing-ezno/

you can use Datalig within Flix https://flix.dev/

> recently added support for package management

Are there any [plans for] supply chain attack mitigations?

Naively searching, I find https://github.com/flix/flix/issues/4380#issuecomment-123641... (Proposed Principle: A package can be declared as "safe") and https://github.com/flix/flix/issues/2837 (Add capability-safety to polymorphic effects?) the latter closed with working on something related to this https://github.com/flix/flix/issues/3000 (The Road to Algebraic Effects).

I don't know that it's one-to-one in terms of features, but I've been impressed with the Flix language, also on the jvm: https://flix.dev/ .

You might be interested in Flix which has first-class Datalog program values:

https://flix.dev/

https://doc.flix.dev/fixpoints.html

(I am one of the developers of Flix)

I like it. Modern languages that distinguish between pure and impure programs like Flix, Koka, and Effekt do so on the type level instead of syntactically. This has three advantages:

I work almost 100% in Scala because it has the most advanced functional features (proper pattern matching, higher-kinded types, typeclasses, ...) and very powerful metaprogramming abilities, while being compatible with the Java OO model as long as you consume Java libraries (the other way around can be tricky, Kotlin is much better there). Only Flix takes it further but it's still an immature project.