diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 294c4991286..4ccc8f84de9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -107,9 +107,8 @@ namespace ts {
             getReturnTypeOfSignature,
             getNonNullableType,
             createTypeNode,
-            createTypeParameterDeclarationFromType,
             createIndexSignatureFromIndexInfo,
-            createParameterDeclarationFromSymbol,
+            createSignatureParts,
             getSymbolsInScope: (location, meaning) => {
                 location = getParseTreeNode(location);
                 return location ? getSymbolsInScope(location, meaning) : [];
@@ -2222,13 +2221,6 @@ namespace ts {
             return parameterNode;
         }
 
-        /* @internal */
-        type SignatureParts = {
-            typeParameters: TypeParameterDeclaration[] | undefined;
-            parameters: ParameterDeclaration[];
-            type: TypeNode;
-        }
-
         // TODO: expose this, remove copy from helper, possibly don't expose createParameter/TypeParameter?
         function createSignatureParts(signature: Signature): SignatureParts {
             return {
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index acca1b7398c..679e11fa255 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2468,14 +2468,12 @@ namespace ts {
         /* @internal */ getParameterType(signature: Signature, parameterIndex: number): Type;
         getNonNullableType(type: Type): Type;
 
-        /** Note that the resulting type node cannot be checked. */
+        /** Note that the resulting nodes cannot be checked. */
         createTypeNode(type: Type): TypeNode;
-        /** Note that the resulting type node cannot be checked. */
-        createTypeParameterDeclarationFromType(type: Type): TypeParameterDeclaration;
-        /** Note that the resulting type node cannot be checked. */
-        createIndexSignatureFromIndexInfo(indexInfo: IndexInfo, kind: IndexKind): IndexSignatureDeclaration
-        /** Note that the resulting type node cannot be checked. */
-        createParameterDeclarationFromSymbol(parameterSymbol: Symbol): ParameterDeclaration;
+        /** Note that the resulting nodes cannot be checked. */
+        createIndexSignatureFromIndexInfo(indexInfo: IndexInfo, kind: IndexKind): IndexSignatureDeclaration;
+        /** Note that the resulting nodes cannot be checked. */
+        createSignatureParts(signature: Signature): SignatureParts;
 
         getSymbolsInScope(location: Node, meaning: SymbolFlags): Symbol[];
         getSymbolAtLocation(node: Node): Symbol;
@@ -3230,6 +3228,12 @@ namespace ts {
         declaration?: SignatureDeclaration;
     }
 
+    export interface SignatureParts {
+        typeParameters: TypeParameterDeclaration[] | undefined;
+        parameters: ParameterDeclaration[];
+        type: TypeNode;
+    }
+
     /* @internal */
     export interface TypeMapper {
         (t: TypeParameter): Type;
diff --git a/src/services/codefixes/helpers.ts b/src/services/codefixes/helpers.ts
index e98235c3c8b..a8347cb0a9b 100644
--- a/src/services/codefixes/helpers.ts
+++ b/src/services/codefixes/helpers.ts
@@ -93,7 +93,7 @@ namespace ts.codefix {
                     // TODO: get parameters working.
                     // TODO: add support for type parameters.
                     const signature = signatures[0];
-                    const signatureParts = getSignatureParts(signature);
+                    const signatureParts = checker.createSignatureParts(signature);
                     return createStubbedMethod(modifiers, name, optional, signatureParts.typeParameters, signatureParts.parameters, signatureParts.type);
                 }
 
@@ -101,7 +101,7 @@ namespace ts.codefix {
                 for (let i = 0; i < signatures.length; i++) {
                     // TODO: make signatures instead of methods
                     const signature = signatures[i];
-                    const signatureParts = getSignatureParts(signature);
+                    const signatureParts = checker.createSignatureParts(signature);
                     signatureDeclarations.push(createMethod(
                           /*decorators*/ undefined
                         , modifiers
@@ -116,7 +116,7 @@ namespace ts.codefix {
 
                 if (declarations.length > signatures.length) {
                     let signature = checker.getSignatureFromDeclaration(declarations[declarations.length - 1] as SignatureDeclaration);
-                    const signatureParts = getSignatureParts(signature);
+                    const signatureParts = checker.createSignatureParts(signature);
                     signatureDeclarations.push(createStubbedMethod(modifiers, name, optional, signatureParts.typeParameters, signatureParts.parameters, signatureParts.type));
                 }
                 else {
@@ -128,20 +128,6 @@ namespace ts.codefix {
             default:
                 return undefined;
         }
-
-        type SignatureParts = {
-            typeParameters: TypeParameterDeclaration[];
-            parameters: ParameterDeclaration[];
-            type: TypeNode;
-        }
-
-        function getSignatureParts(signature: Signature): SignatureParts {
-            return {
-                typeParameters: signature.typeParameters && signature.typeParameters.map(checker.createTypeParameterDeclarationFromType),
-                parameters: signature.getParameters().map(symbol => checker.createParameterDeclarationFromSymbol(symbol)),
-                type: createTypeNodeExceptAny(checker.getReturnTypeOfSignature(signature), checker)
-            }
-        }
     }
 
     function createMethodImplementingSignatures(signatures: Signature[], name: PropertyName, optional: boolean, modifiers: Modifier[] | undefined): MethodDeclaration {
@@ -234,9 +220,4 @@ namespace ts.codefix {
         }
         return undefined;
     }
-
-    function createTypeNodeExceptAny(type: Type, checker: TypeChecker) {
-        const typeNode = checker.createTypeNode(type);
-        return typeNode && typeNode.kind !== SyntaxKind.AnyKeyword ? typeNode : undefined;
-    }
 }
\ No newline at end of file