use module id if available for umd global name - fixes #1166

test/core/fixtures/transformation/es6.modules-umd/module-id/actual.js

@@ -0,0 +1 @@
+foobar();

test/core/fixtures/transformation/es6.modules-umd/module-id/expected.js

@@ -0,0 +1,17 @@
+(function (global, factory) {
+  if (typeof define === "function" && define.amd) {
+    define("MyLib", ["exports"], factory);
+  } else if (typeof exports !== "undefined") {
+    factory(exports);
+  } else {
+    var mod = {
+      exports: {}
+    };
+    factory(mod.exports);
+    global.MyLib = mod.exports;
+  }
+})(this, function (exports) {
+  "use strict";
+
+  foobar();
+});

test/core/fixtures/transformation/es6.modules-umd/module-id/options.json

@@ -0,0 +1,3 @@
+{
+  "moduleId": "MyLib"
+}