diff -u b/core/.eslintrc.json b/core/.eslintrc.json
--- b/core/.eslintrc.json
+++ b/core/.eslintrc.json
@@ -35,6 +35,5 @@
       "requireReturn": false
     }],
-    "brace-style": ["error", "stroustrup"],
-    "no-mutable-exports": [0]
+    "brace-style": ["error", "stroustrup"]
   }
 }