esm: require braces for modules code

Author: GeoffreyBooth

.eslintrc.js

@@ -53,10 +53,10 @@ module.exports = {
   overrides: [
     {
       files: [
-        'test/es-module/test-esm-type-flag.js',
-        'test/es-module/test-esm-type-flag-alias.js',
         '*.mjs',
         'test/es-module/test-esm-example-loader.js',
+        'test/es-module/test-esm-type-flag.js',
+        'test/es-module/test-esm-type-flag-alias.js',
       ],
       parserOptions: { sourceType: 'module' },
     },
@@ -111,6 +111,14 @@ module.exports = {
         },
       ] },
     },
+    {
+      files: [
+        'lib/internal/modules/**/*.js',
+      ],
+      rules: {
+        'curly': 'error',
+      },
+    },
     {
       files: [
         'lib/internal/test_runner/**/*.js',