Legacy code. It can be...fragile. It really helps if you can already be sure what types your functions expect and return, but what if past-you didn't include type specs, making life harder for now-you?

Thankfully, TypEr already exists, but what if we could sprinkle on some pixie dust and make it more automagic? There's a Rebar3 plugin for that! Come learn about the tools used to create that plugin, discoveries along the way, and enhancements made to TypEr in the process.

Code BEAM America 2022