Restructured library.

lib/3rdparty/systemjs/babel-helpers/defineProperty.js

@@ -0,0 +1,14 @@
+export default (function (obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+
+  return obj;
+});