diff --git a/src/descriptor.ts b/src/descriptor.ts
index 3153c11..2d8d849 100644
--- a/src/descriptor.ts
+++ b/src/descriptor.ts
@@ -618,76 +618,6 @@ function createMessageSignature(
   return ts.factory.createTypeLiteralNode(fieldSignatures);
 }
 
-function createPrimitiveMessageSignature(
-  rootDescriptor: descriptor.FileDescriptorProto,
-  messageDescriptor: descriptor.DescriptorProto,
-) {
-  const fieldSignatures = [];
-
-  const wrapMessageType = (
-    fieldType: ts.TypeReferenceNode,
-  ): ts.TypeReferenceNode => {
-    const type = ts.factory.createTypeQueryNode(
-      ts.factory.createQualifiedName(
-        ts.factory.createQualifiedName(fieldType.typeName, "prototype"),
-        "toObject",
-      ),
-    );
-    return ts.factory.createTypeReferenceNode("ReturnType", [type]);
-  };
-
-  for (const fieldDescriptor of messageDescriptor.field) {
-    let fieldType: ts.TypeNode = field.getType(fieldDescriptor, rootDescriptor);
-
-    if (field.isMap(fieldDescriptor)) {
-      const [keyDescriptor, valueDescriptor] = type.getMapDescriptor(
-        fieldDescriptor.type_name,
-      )!.field;
-
-      let valueType = field.getType(valueDescriptor, rootDescriptor);
-
-      if (field.isMessage(valueDescriptor)) {
-        valueType = wrapMessageType(valueType);
-      }
-
-      fieldType = ts.factory.createTypeLiteralNode([
-        ts.factory.createIndexSignature(
-          undefined,
-          [
-            ts.factory.createParameterDeclaration(
-              undefined,
-              undefined,
-              "key",
-              undefined,
-              field.getType(keyDescriptor, rootDescriptor),
-            ),
-          ],
-          valueType as ts.TypeNode,
-        ),
-      ]);
-    } else if (field.isMessage(fieldDescriptor)) {
-      fieldType = wrapMessageType(fieldType as ts.TypeReferenceNode);
-    }
-
-    fieldSignatures.push(
-      ts.factory.createPropertySignature(
-        undefined,
-        getFieldName(fieldDescriptor),
-        (
-          field.isOptional(rootDescriptor, fieldDescriptor) ||
-          field.isMessage(fieldDescriptor) ||
-          field.isRequiredWithoutExplicitDefault(rootDescriptor, fieldDescriptor)
-        )
-          ? ts.factory.createToken(ts.SyntaxKind.QuestionToken)
-          : undefined,
-        field.wrapRepeatedType(fieldType as ts.TypeNode, fieldDescriptor),
-      ),
-    );
-  }
-
-  return ts.factory.createTypeLiteralNode(fieldSignatures);
-}
-
 function getPivot(descriptor: descriptor.DescriptorProto) {
   const kDefaultPivot = 500;
   let max_field_number = 0;