1 files changed, 30 insertions, 0 deletions
diff --git a/lib/gitlab/ci/config/node/undefined.rb b/lib/gitlab/ci/config/node/undefined.rb
new file mode 100644
index 00000000000..699605e1e3a
--- /dev/null
+++ b/lib/gitlab/ci/config/node/undefined.rb
@@ -0,0 +1,30 @@
+module Gitlab
+  module Ci
+    class Config
+      module Node
+        ##
+        # This class represents an undefined entry node.
+        #
+        # It takes original entry class as configuration and returns default
+        # value of original entry as self value.
+        #
+        #
+        class Undefined < Entry
+          include Validatable
+
+          validations do
+            validates :config, type: Class
+          end
+
+          def value
+            @config.default
+          end
+
+          def defined?
+            false
+          end
+        end
+      end
+    end
+  end
+end