Add steep infrastructure for testing type signatures

- added steep and rbs to gemspec
- added type signature tests to github actions
- updated Steepfile

Author: rarruda

.github/workflows/pull_request.yml

@@ -18,6 +18,10 @@ jobs:
         bundler-cache: true
     - name: Run RuboCop
       run: bundle exec rubocop
+    - name: Run Steep / RBS Type signature verification
+      run: |
+        steep check --steepfile=./Steepfile --severity-level=error | ruby -pe 'sub(/^(.+):(\d+):(\d+): (.+)$/, %q{::error file=\1,line=\2,col=\3::\4})'
+      shell: bash
 
   test:
     runs-on: ${{ matrix.os }}-latest

Steepfile

@@ -1,28 +1,31 @@
-# D = Steep::Diagnostic
-#
+D = Steep::Diagnostic
+
 target :lib do
-  signature "sig"
+  signature "*.rbs"
+
+  check "lib/unleash/client.rb"
+  check "lib/unleash/context.rb"
+  check "lib/unleash/scheduled_executor.rb"
 
-  # check "lib/unleash/client.rbs"                       # Directory name
-  check "lib"                       # Directory name
-  # check "Gemfile"                   # File name
-  # check "app/models/**/*.rb"        # Glob
-  # ignore "lib/templates/*.rb"
+  ignore "lib/unleash/bootstrap"
+  ignore "lib/unleash/strategy/*.rb"
+  ignore "lib/unleash/util"
+
+  ignore "lib/unleash/constraint.rb"
+  ignore "lib/unleash/feature_toggle.rb"
+  ignore "lib/unleash/metrics.rb"
+  ignore "lib/unleash/metrics_reporter.rb"
+  ignore "lib/unleash/toggle_fetcher.rb"
+  ignore "lib/unleash/variant_definition.rb"
+  ignore "lib/unleash/variant_override.rb"
 
   # library "pathname", "set"       # Standard libraries
   # library "strong_json"           # Gems
 
   # configure_code_diagnostics(D::Ruby.strict)       # `strict` diagnostics setting
   # configure_code_diagnostics(D::Ruby.lenient)      # `lenient` diagnostics setting
-  # configure_code_diagnostics do |hash|             # You can setup everything yourself
-  #   hash[D::Ruby::NoMethod] = :information
-  # end
+  configure_code_diagnostics do |hash|             # You can setup everything yourself
+    hash[D::Ruby::NoMethod] = :information
+    hash[D::Ruby::UnsupportedSyntax] = :information
+  end
 end
-
-# target :test do
-# #   signature "sig", "sig-private"
-# #
-#   check "spec"
-# #
-# #   # library "pathname", "set"       # Standard libraries
-# end

lib/unleash/client.rb

@@ -162,7 +162,7 @@ def register
     end
 
     def disabled_variant
-      @disabled_variant ||= Unleash::FeatureToggle.disabled_variant
+      Unleash::FeatureToggle.disabled_variant
     end
 
     def first_fetch_is_eager

unleash-client.gemspec

@@ -39,4 +39,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "simplecov", "~> 0.21.2"
   spec.add_development_dependency "simplecov-lcov", "~> 0.8.0"
+
+  spec.add_development_dependency "rbs", "~> 2.7"
+  spec.add_development_dependency "steep", "~> 1.2"
 end