Go with Babel Stage 1 for export extensions.

Author: timdorr

.babelrc

@@ -1,3 +1,3 @@
 {
-    "presets": ["es2015", "stage-2"]
+    "presets": ["es2015", "stage-1"]
 }

package.json

@@ -41,8 +41,8 @@
     "babel-core": "^6.2.1",
     "babel-eslint": "^4.1.6",
     "babel-loader": "^6.2.0",
-    "babel-preset-es2015": "^6.1.2",
-    "babel-preset-stage-2": "^6.3.13",
+    "babel-preset-es2015": "^6.3.13",
+    "babel-preset-stage-1": "^6.3.13",
     "eslint": "^1.10.3",
     "eslint-config-rackt": "^1.1.1",
     "eslint-plugin-react": "^3.15.0",