Refactor according to feedback

Author: jackyho112

lib/rules/jsx-curly-brace-presence.js

@@ -27,8 +27,8 @@ module.exports = {
       {
         type: 'object',
         properties: {
-          props: {enum: optionValues},
-          children: {enum: optionValues}
+          props: {enum: optionValues, default: optionNever},
+          children: {enum: optionValues, default: optionNever}
         },
         additionalProperties: false
       }
@@ -116,15 +116,15 @@ module.exports = {
     // --------------------------------------------------------------------------
 
     return {
-      JSXExpressionContainer: function(node) {
+      JSXExpressionContainer: node => {
         const {expression: {type}, parent} = node;
 
         if (shouldCheckForUnnecessaryCurly(type, parent, userConfig)) {
           lintUnnecessaryCurly(node);
         }
       },
 
-      Literal: function(node) {
+      Literal: node => {
         const {parent: {type: parentType}} = node;
 
         if (shouldCheckForMissingCurly(parentType, userConfig)) {