diff --git a/packages/ses/scripts/hermesTransforms.js b/packages/ses/scripts/hermesTransforms.js
index 396aba8e35..033dce50e6 100644
--- a/packages/ses/scripts/hermesTransforms.js
+++ b/packages/ses/scripts/hermesTransforms.js
@@ -1,14 +1,15 @@
-// @ts-nocheck XXX Babel types
 /* eslint-disable import/no-extraneous-dependencies */
 import { parse } from '@babel/parser';
 import babelGenerate from '@agoric/babel-generator';
 import babelTraverse from '@babel/traverse';
 import * as t from '@babel/types';
 
+// @ts-expect-error TS2339 Property 'default' does not exist
 const traverse = babelTraverse.default || babelTraverse;
 const generate = babelGenerate.default || babelGenerate;
 
 const decoder = new TextDecoder('utf-8');
+// @ts-expect-error TS2554 Expected 0 arguments, but got 1
 const encoder = new TextEncoder('utf-8');
 
 const asyncArrowEliminator = {
@@ -56,6 +57,7 @@ export const hermesTransforms = {
     traverse(ast, transforms);
 
     const { code } = generate(ast, {
+      // Nothing being done with sourcemaps as this point
       retainLines: true,
       compact: true,
       verbatim: true,