fix: always add default property to allow require+import (#961)

Author: lukepolo

.babelrc

@@ -3,6 +3,11 @@
     ["@babel/preset-env", {"targets": {"node": "0.10"}}]
   ],
   "plugins": [
-    "add-module-exports"
+    [
+      "add-module-exports",
+      {
+        "addDefaultProperty": true
+      }
+    ]
   ]
 }

index.js

@@ -239,4 +239,5 @@ var validator = {
 };
 var _default = validator;
 exports.default = _default;
-module.exports = exports.default;
+module.exports = exports.default;
+module.exports.default = exports.default;