Install type check

Steepfile

@@ -0,0 +1,27 @@
+# D = Steep::Diagnostic
+#
+target :lib do
+  signature 'sig'
+
+  check 'lib'
+  check 'Rakefile'
+  # ignore "lib/templates/*.rb"
+
+  library 'uri'
+  # 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
+end
+
+# target :test do
+#   signature "sig", "sig-private"
+#
+#   check "test"
+#
+#   # library "pathname", "set"       # Standard libraries
+# end

lib/rakuten_web_service/search_result.rb

@@ -38,7 +38,7 @@ def params
     end
 
     def params_to_get_next_page
-      @params.merge('page' => @response.body['page'] + 1)
+      @params.merge(page: @response.body['page'] + 1)
     end
 
     def order(options)

rakuten_web_service.gemspec

@@ -22,7 +22,9 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rexml', '~> 3.2'
   spec.add_development_dependency 'rspec', '~> 3.9'
+  spec.add_development_dependency 'steep', '~> 0.46'
   spec.add_development_dependency 'tapp', '~> 1.5.1'
-  spec.add_development_dependency 'terminal-table', '~> 1.8.0'
+  spec.add_development_dependency 'terminal-table', '~> 2.0'
+  spec.add_development_dependency 'typeprof', '~> 0.15'
   spec.add_development_dependency 'webmock', '~> 3.9'
 end