Issue #3335653 by mherchel, Spokje: commit-code-check.sh doesn't allow...

Issue #3335653 by mherchel, Spokje: commit-code-check.sh doesn't allow optional chaining in JavaScript

core/.eslintrc.json

@@ -10,6 +10,9 @@
     "es6": true,
     "node": true
   },
+  "parserOptions": {
+    "ecmaVersion": 2020
+  },
   "globals": {
     "Drupal": true,
     "drupalSettings": true,