Re-enable transform-react-constant-elements (#1552)

* Bump babel deps

* Re-enable transform-react-constant-elements

Resolves #553

packages/babel-preset-react-app/index.js

@@ -109,13 +109,8 @@ if (env === 'test') {
 
   if (env === 'production') {
     // Optimization: hoist JSX that never changes out of render()
-    // Disabled because of issues:
-    // * https://github.com/facebookincubator/create-react-app/issues/525
-    // * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/
-    // * https://github.com/babel/babel/issues/4516
-    // TODO: Enable again when these issues are resolved.
-    // plugins.push.apply(plugins, [
-    //   require.resolve('babel-plugin-transform-react-constant-elements')
-    // ]);
+    plugins.push.apply(plugins, [
+      require.resolve('babel-plugin-transform-react-constant-elements')
+    ]);
   }
 }

packages/babel-preset-react-app/package.json

@@ -12,18 +12,18 @@
   ],
   "dependencies": {
     "babel-plugin-syntax-dynamic-import": "6.18.0",
-    "babel-plugin-transform-class-properties": "6.22.0",
-    "babel-plugin-transform-es2015-parameters": "6.22.0",
-    "babel-plugin-transform-object-rest-spread": "6.22.0",
-    "babel-plugin-transform-react-constant-elements": "6.22.0",
-    "babel-plugin-transform-react-jsx": "6.22.0",
+    "babel-plugin-transform-class-properties": "6.23.0",
+    "babel-plugin-transform-es2015-parameters": "6.23.0",
+    "babel-plugin-transform-object-rest-spread": "6.23.0",
+    "babel-plugin-transform-react-constant-elements": "6.23.0",
+    "babel-plugin-transform-react-jsx": "6.23.0",
     "babel-plugin-transform-react-jsx-self": "6.22.0",
     "babel-plugin-transform-react-jsx-source": "6.22.0",
     "babel-plugin-transform-regenerator": "6.22.0",
-    "babel-plugin-transform-runtime": "6.22.0",
+    "babel-plugin-transform-runtime": "6.23.0",
     "babel-preset-env": "1.1.8",
     "babel-preset-latest": "6.22.0",
-    "babel-preset-react": "6.22.0",
-    "babel-runtime": "6.22.0"
+    "babel-preset-react": "6.23.0",
+    "babel-runtime": "6.23.0"
   }
 }

packages/react-scripts/package.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "autoprefixer": "6.7.2",
-    "babel-core": "6.22.1",
+    "babel-core": "6.23.1",
     "babel-eslint": "7.1.1",
     "babel-jest": "18.0.0",
     "babel-loader": "6.2.10",