refactor(ses): Compensate Hermes transform for Babel upgrade

Author: kriskowal

packages/ses/package.json

@@ -97,10 +97,10 @@
     "@endo/env-options": "workspace:^"
   },
   "devDependencies": {
-    "@babel/generator": "^7.23.6",
-    "@babel/parser": "^7.23.6",
-    "@babel/traverse": "^7.23.6",
-    "@babel/types": "^7.24.0",
+    "@babel/generator": "^7.26.3",
+    "@babel/parser": "~7.26.2",
+    "@babel/traverse": "~7.25.9",
+    "@babel/types": "~7.26.0",
     "@endo/compartment-mapper": "workspace:^",
     "@endo/module-source": "workspace:^",
     "@endo/test262-runner": "workspace:^",

packages/ses/scripts/hermes-transforms.js

@@ -73,16 +73,24 @@ export const hermesTransforms = {
 
     const ast = parse(sourceString, {
       sourceType: 'module',
+      tokens: true,
+      createParenthesizedExpressions: true,
     });
 
     traverse(ast, transforms, undefined, { filename: location });
 
-    const { code } = generate(ast, {
-      // Nothing being done with sourcemaps as this point
-      retainLines: true,
-      compact: true,
-      verbatim: true,
-    });
+    const { code } = generate(
+      ast,
+      {
+        // Nothing being done with sourcemaps as this point
+        // @ts-expect-error - Property currently absent on versioned types
+        experimental_preserveFormat: true,
+        preserveFormat: true,
+        retainLines: true,
+        verbatim: true,
+      },
+      sourceString,
+    );
 
     return { bytes: encoder.encode(code), parser: 'mjs', sourceMap };
   },