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Type signature for Ruby classes
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Latest commit caeb7f8 Jul 23, 2019
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bin bundle gem Mar 10, 2019
exe Add rbi command Apr 20, 2019
lib/ruby Pass env to #load Jul 22, 2019
stdlib Fix Kernel#raise type Jun 29, 2019
test Pass env to #load Jul 22, 2019
.gitignore 🐈 Mar 24, 2019
.travis.yml bundle gem Mar 10, 2019
Gemfile bundle gem Mar 10, 2019 Fix link URL May 11, 2019
Rakefile 🐈 Mar 24, 2019
ruby-signature.gemspec Fix URL in gemspec May 22, 2019


Ruby::Signature provides syntax and semantics definition for the Ruby Signature language, .rbi files. It consists of a parser, the syntax, and class definition interpreter, the semantics.


We haven't published a gem yet. You need to install the dependencies, and build its parser.

$ bundle
$ bundle exec rake parser
$ bundle exec exe/ruby-signature


$ ruby-signature list
$ ruby-signature ancestors ::Object
$ ruby-signature methods ::Object
$ ruby-signature method ::Object tap

ruby-signature [--class|--module|interface] list

$ ruby-signature list

This command lists all of the classes/modules/interfaes defined in .rbi files.

ruby-signature ancestors [--singleton|--instance] CLASS

$ ruby-signature ancestors Array                    # ([].class.ancestors)
$ ruby-signature ancestors --singleton Array        # (Array.class.ancestors)

This command prints the ancestors of the class. The name of the command is borrowed from Class#ancestors, but the semantics is a bit different. The ancestors command is more precise (I believe).

ruby-signature methods [--singleton|--instance] CLASS

$ ruby-signature methods ::Integer                  # 1.methods
$ ruby-signature methods --singleton ::Object       # Object.methods

This command prints all methods provided for the class.

ruby-signature method [--singleton|--instance] CLASS METHOD

$ ruby-signature method ::Integer '+'               # 1+2
$ ruby-signature method --singleton ::Object tap    # Object.tap { ... }

This command prints type and properties of the method.


It accepts two global options, -r and -I.

-r is for libraries. You can specify the names of libraries.

$ ruby-signature -r set list

-I is for application signatures. You can specify the name of directory.

$ ruby-signature -I sig list


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at

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