(PUP-11597) A working, but very likely not ideal fix for PUP-11597

lib/puppet/generate/type.rb

@@ -46,7 +46,24 @@ def format=(format)
         # @return [Boolean] Returns true if the output is up-to-date or false if not.
         def up_to_date?(outputdir)
           f = effective_output_path(outputdir)
-          Puppet::FileSystem::exist?(f) && (Puppet::FileSystem::stat(@path) <=> Puppet::FileSystem::stat(f)) <= 0
+          # Check the fast-path scenarios first.
+          unless Puppet::FileSystem::exist?(f)
+            Puppet.debug("#{f} does not exist.")
+            return false
+          end
+          unless (Puppet::FileSystem::stat(@path) <=> Puppet::FileSystem::stat(f)) <= 0
+            Puppet.debug("#{@path} is newer than #{f}")
+            return false
+          end
+          # Check for updates to any module lib files.
+          module_lib_files = Dir.glob(@base + "/lib/**/*.rb")
+          module_lib_files.each do |lib|
+            unless (Puppet::FileSystem::stat(lib) <=> Puppet::FileSystem::stat(f)) <= 0
+              Puppet.debug("#{lib} is newer than #{f}")
+              return false
+            end
+          end
+          return true
         end
 
         # Gets the filename of the output file.