Introducing Mavis, a comprehensive Typing Library for Elixir:

Mavis fully utilizes Elixir’s Protocol system to create a fluent and composable type analysis library for erlang and Elixir’s types. The type analysis logic is hand-crafted to fit the pragmatic choices that were made when the BEAM was designed (and extended, e.g. with the map type), and does not attempt to square the BEAM’s types to a preexisting type-theoretical framework. Because of the operations that it supports, I expect it to be able to be more powerful than Dialyzer or Gradualyzer.

Hex:

Github:
https://github.com/ityonemo/mavis/

This is the first stage in my “Selectrix” project which is a shot at bringing compile-time type analysis to Elixir as an optional add-in library.

I’d love it if the community could play around with the library to get a sense of what it can do (and hopefully also find bugs!)