Configure ESLint with allowed syntax

Author: colinrotherham

packages/.eslintrc.js

@@ -16,9 +16,25 @@ module.exports = {
       },
       plugins: ['es-x'],
       rules: {
+        // Babel transpiles ES2020 class fields
+        'es-x/no-class-fields': 'off',
+
+        // Babel transpiles ES2022 class static fields
+        'es-x/no-class-static-fields': 'off',
+
         // ES modules include ES2016 '[].includes()' coverage
         // https://browsersl.ist/#q=supports+es6-module+and+not+supports+array-includes
-        'es-x/no-array-prototype-includes': 'off'
+        'es-x/no-array-prototype-includes': 'off',
+
+        // Babel transpiles ES2020 `??` nullish coalescing
+        'es-x/no-nullish-coalescing-operators': 'off',
+
+        // ES modules include ES2017 'Object.entries()' coverage
+        // https://browsersl.ist/#q=supports+es6-module+and+not+supports+object-entries
+        'es-x/no-object-entries': 'off',
+
+        // Babel transpiles ES2020 optional chaining
+        'es-x/no-optional-chaining': 'off'
       }
     }
   ]