diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index a45f3424efe..3c2eb8c513c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -2202,28 +2202,7 @@ namespace ts {
             return result;
         }
 
-        function createNodeBuilder(): NodeBuilder {
-
-            interface NodeBuilderContext {
-                readonly enclosingDeclaration: Node | undefined;
-                readonly flags: NodeBuilderFlags | undefined;
-                encounteredError: boolean;
-                inObjectTypeLiteral: boolean;
-                checkAlias: boolean;
-                symbolStack: Symbol[] | undefined;
-            }
-
-            function createNodeBuilderContext(enclosingDeclaration: Node | undefined, flags: NodeBuilderFlags | undefined): NodeBuilderContext {
-                return {
-                    enclosingDeclaration,
-                    flags,
-                    encounteredError: false,
-                    inObjectTypeLiteral: false,
-                    checkAlias: true,
-                    symbolStack: undefined
-                };
-            }
-
+        function createNodeBuilder() {
             let context: NodeBuilderContext;
 
             return {
@@ -2247,6 +2226,26 @@ namespace ts {
                 }
             };
 
+            interface NodeBuilderContext {
+                readonly enclosingDeclaration: Node | undefined;
+                readonly flags: NodeBuilderFlags | undefined;
+                encounteredError: boolean;
+                inObjectTypeLiteral: boolean;
+                checkAlias: boolean;
+                symbolStack: Symbol[] | undefined;
+            }
+
+            function createNodeBuilderContext(enclosingDeclaration: Node | undefined, flags: NodeBuilderFlags | undefined): NodeBuilderContext {
+                return {
+                    enclosingDeclaration,
+                    flags,
+                    encounteredError: false,
+                    inObjectTypeLiteral: false,
+                    checkAlias: true,
+                    symbolStack: undefined
+                };
+            }
+
             function typeToTypeNodeHelper(type: Type): TypeNode {
                 if (!type) {
                     context.encounteredError = true;
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 178e6fe7795..a93e8bddef1 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2535,14 +2535,6 @@ namespace ts {
         /* @internal */ getTypeCount(): number;
     }
 
-    /** Note that any resulting nodes cannot be checked. */
-    /* @internal */
-    export interface NodeBuilder {
-        typeToTypeNode(type: Type, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): TypeNode;
-        signatureToSignatureDeclaration(signature: Signature, kind: SyntaxKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): SignatureDeclaration;
-        indexInfoToIndexSignatureDeclaration(indexInfo: IndexInfo, kind: IndexKind, enclosingDeclaration?: Node, flags?: NodeBuilderFlags): IndexSignatureDeclaration;
-    }
-
     export enum NodeBuilderFlags {
         None                                    = 0,
         allowThisInObjectLiteral                = 1 << 0,