Test env:modules:false in babelrc

https://stackoverflow.com/questions/43042889/typescript-referenceerror-exports-is-not-defined

Author: marshallswain

.babelrc

@@ -1,4 +1,8 @@
 {
   "plugins": [ "add-module-exports" ],
-  "presets": [ "es2015", "stage-2"]
+  "presets": [
+    [ "env", { "modules": false } ],
+    "es2015",
+    "stage-2"
+  ]
 }