diff --git a/jest/preprocessor.js b/jest/preprocessor.js
index b9ae6faf2..6c71b795e 100644
--- a/jest/preprocessor.js
+++ b/jest/preprocessor.js
@@ -41,10 +41,12 @@ module.exports = {
       // node specific transforms only
       return babelTransformSync(
         src,
-        Object.assign(
-          {filename: file},
-          {sourceType: 'script', ...nodeOptions, ast: false},
-        ),
+        {
+          filename: file,
+          sourceType: 'script',
+          ...nodeOptions,
+          ast: false
+        },
       ).code;
     }