Override no-unused-expressions with the typescript-eslint version (#8003)

Fixes issues with optional chaining

Author: maxdavidson

packages/eslint-config-react-app/index.js

@@ -92,6 +92,15 @@ module.exports = {
             typedefs: false,
           },
         ],
+        'no-unused-expressions': 'off',
+        '@typescript-eslint/no-unused-expressions': [
+          'error',
+          {
+            allowShortCircuit: true,
+            allowTernary: true,
+            allowTaggedTemplates: true,
+          },
+        ],
         'no-unused-vars': 'off',
         '@typescript-eslint/no-unused-vars': [
           'warn',