This is type checker for Ruby at runtime using YARD.


Add this line to your application's Gemfile:

gem 'doc_type_checker'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install doc_type_checker



DocTypeChecker.configure do |config|
  config.enabled = true # or false, default is false
  config.yard_run_arguments = ['--hide-void-return']
  # Throw exception if type validation fails.
  config.strict = true # or false, default is false
  config.logger = # default is nil


  • Support enumerate types Array<String>, Hash<Symbol, String>
  • Support method types #to_s


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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[USERNAME]/doc_type_checker.


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