Brain Freeze is a gem for generating a Sorbet RBI from inline types or other RBIs within a project.

It is an ultra-simple script based on Parlour. It loads the project using Parlour's type parsing and loading, filters the objects within it, and then generates a new RBI.

At the root of a Sorbet project, to generate an RBI file called foo.rbi:

brain_freeze --output-file foo.rbi

It's likely this will include types you don't want, such as external RBIs. To filter to only the modules you'd like to include:

brain_freeze --output-file foo.rbi --include-module Foo --include-module Bar

This will remove definitions for all namespaces except Foo and Bar. (Please note that this doesn't support nested namespaces yet, like A::B.)

• If you get any JSON parsing errors, you might not have Sorbet currently installed in your Bundler environment - run bundle install.

• If you get errors about conflicting namespaces, delete any RBIs previously generated with Brain Freeze for the same project.

Brain Freeze contains a set of project tests, which are tests which simulate running it on a Sorbet project. These tests are in spec/projects. Each one requires:

• A Ruby source file which Brain Freeze will read.
• A sorbet directory containing a config file, whose content is simply the name of the Ruby source file. This tells Sorbet which file to read when typechecking, without requiring a full srb inited project.
• An expected.rbi file with the expected output of Brain Freeze.

Bug reports and pull requests are welcome on GitHub at https://github.com/AaronC81/brain_freeze.

The gem is available as open source under the terms of the MIT License.