diff --git a/kyaml/yaml/mapnode.go b/kyaml/yaml/mapnode.go
new file mode 100644
index 000000000..31b41b40f
--- /dev/null
+++ b/kyaml/yaml/mapnode.go
@@ -0,0 +1,40 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package yaml
+
+// MapNode wraps a field key and value.
+type MapNode struct {
+	Key   *RNode
+	Value *RNode
+}
+
+// IsNilOrEmpty returns true if the MapNode is nil,
+// has no value, or has a value that appears empty.
+func (mn *MapNode) IsNilOrEmpty() bool {
+	return mn == nil || mn.Value.IsNilOrEmpty()
+}
+
+type MapNodeSlice []*MapNode
+
+func (m MapNodeSlice) Keys() []*RNode {
+	var keys []*RNode
+	for i := range m {
+		if m[i] != nil {
+			keys = append(keys, m[i].Key)
+		}
+	}
+	return keys
+}
+
+func (m MapNodeSlice) Values() []*RNode {
+	var values []*RNode
+	for i := range m {
+		if m[i] != nil {
+			values = append(values, m[i].Value)
+		} else {
+			values = append(values, nil)
+		}
+	}
+	return values
+}
diff --git a/kyaml/yaml/mapnode_test.go b/kyaml/yaml/mapnode_test.go
new file mode 100644
index 000000000..9b76523c3
--- /dev/null
+++ b/kyaml/yaml/mapnode_test.go
@@ -0,0 +1,51 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package yaml
+
+import (
+	"testing"
+)
+
+func TestMapNodeIsNilOrEmpty(t *testing.T) {
+	var mn *MapNode
+
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("nil should be empty")
+	}
+
+	mn = &MapNode{Key: MakeNullNode()}
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("missing value should be empty")
+	}
+
+	mn.Value = NewRNode(nil)
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("missing value YNode should be empty")
+	}
+
+	mn.Value = MakeNullNode()
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("value tagged null should be empty")
+	}
+
+	mn.Value = NewMapRNode(nil)
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("empty map should be empty")
+	}
+
+	mn.Value = NewMapRNode(&map[string]string{"foo": "bar"})
+	if mn.IsNilOrEmpty() {
+		t.Fatalf("non-empty map should not be empty")
+	}
+
+	mn.Value = NewListRNode()
+	if !mn.IsNilOrEmpty() {
+		t.Fatalf("empty list should be empty")
+	}
+
+	mn.Value = NewListRNode("foo")
+	if mn.IsNilOrEmpty() {
+		t.Fatalf("non-empty list should not be empty")
+	}
+}
diff --git a/kyaml/yaml/types.go b/kyaml/yaml/types.go
index a19e30df9..59ef220f4 100644
--- a/kyaml/yaml/types.go
+++ b/kyaml/yaml/types.go
@@ -88,42 +88,6 @@ func (f FilterFunc) Filter(object *RNode) (*RNode, error) {
 	return f(object)
 }
 
-// MapNode wraps a field key and value.
-type MapNode struct {
-	Key   *RNode
-	Value *RNode
-}
-
-// IsNilOrEmpty returns true if the MapNode is nil,
-// has no value, or has a value that appears empty.
-func (mn *MapNode) IsNilOrEmpty() bool {
-	return mn == nil || mn.Value.IsNilOrEmpty()
-}
-
-type MapNodeSlice []*MapNode
-
-func (m MapNodeSlice) Keys() []*RNode {
-	var keys []*RNode
-	for i := range m {
-		if m[i] != nil {
-			keys = append(keys, m[i].Key)
-		}
-	}
-	return keys
-}
-
-func (m MapNodeSlice) Values() []*RNode {
-	var values []*RNode
-	for i := range m {
-		if m[i] != nil {
-			values = append(values, m[i].Value)
-		} else {
-			values = append(values, nil)
-		}
-	}
-	return values
-}
-
 type TypeMeta struct {
 	Kind       string
 	APIVersion string
diff --git a/kyaml/yaml/types_test.go b/kyaml/yaml/types_test.go
index 14ad7dd6e..1bf8c96a5 100644
--- a/kyaml/yaml/types_test.go
+++ b/kyaml/yaml/types_test.go
@@ -61,46 +61,3 @@ func TestIsYNodeEmptySeq(t *testing.T) {
 		t.Fatalf("a node with content isn't empty")
 	}
 }
-
-func TestMapNodeIsNilOrEmpty(t *testing.T) {
-	var mn *MapNode
-
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("nil should be empty")
-	}
-
-	mn = &MapNode{Key: MakeNullNode()}
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("missing value should be empty")
-	}
-
-	mn.Value = NewRNode(nil)
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("missing value YNode should be empty")
-	}
-
-	mn.Value = MakeNullNode()
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("value tagged null should be empty")
-	}
-
-	mn.Value = NewMapRNode(nil)
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("empty map should be empty")
-	}
-
-	mn.Value = NewMapRNode(&map[string]string{"foo": "bar"})
-	if mn.IsNilOrEmpty() {
-		t.Fatalf("non-empty map should not be empty")
-	}
-
-	mn.Value = NewListRNode()
-	if !mn.IsNilOrEmpty() {
-		t.Fatalf("empty list should be empty")
-	}
-
-	mn.Value = NewListRNode("foo")
-	if mn.IsNilOrEmpty() {
-		t.Fatalf("non-empty list should not be empty")
-	}
-}