use a _context object instead of a __moduleName argument

packages/babel-plugin-transform-es2015-modules-systemjs/src/index.js

@@ -2,7 +2,7 @@ import hoistVariables from "babel-helper-hoist-variables";
 import template from "babel-template";
 
 let buildTemplate = template(`
-  System.register(MODULE_NAME, [SOURCES], function (EXPORT_IDENTIFIER, __moduleName) {
+  System.register(MODULE_NAME, [SOURCES], function (EXPORT_IDENTIFIER, CONTEXT_IDENTIFIER) {
     BEFORE_BODY;
     return {
       setters: [SETTERS],
@@ -52,9 +52,19 @@ export default function ({ types: t }) {
     inherits: require("babel-plugin-transform-strict-mode"),
 
     visitor: {
+      ReferencedIdentifier(path, state) {
+        if (path.node.name == "__moduleName" && !path.scope.hasBinding("__moduleName")) {
+          path.replaceWith(t.memberExpression(state.contextIdent, t.identifier("id")));
+        }
+      },
+
       Program: {
-        exit(path) {
+        enter(path, state) {
+          state.contextIdent = path.scope.generateUidIdentifier("context");
+        },
+        exit(path, state) {
           let exportIdent = path.scope.generateUidIdentifier("export");
+          let contextIdent = state.contextIdent;
 
           let exportNames = Object.create(null);
           let modules = Object.create(null);
@@ -241,7 +251,8 @@ export default function ({ types: t }) {
               SETTERS: setters,
               SOURCES: sources,
               BODY: path.node.body,
-              EXPORT_IDENTIFIER: exportIdent
+              EXPORT_IDENTIFIER: exportIdent,
+              CONTEXT_IDENTIFIER: contextIdent
             })
           ];
         }

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/exports-default/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register([], function (_export, __moduleName) {
+System.register([], function (_export, _context) {
   _export("default", function () {});
 
   _export("default", class {});

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/exports-from/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo"], function (_export, __moduleName) {
+System.register(["foo"], function (_export, _context) {
   return {
     setters: [function (_foo) {
       var _exportObj = {};

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/exports-named/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register([], function (_export, __moduleName) {
+System.register([], function (_export, _context) {
   return {
     setters: [],
     execute: function () {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/exports-variable/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register([], function (_export, __moduleName) {
+System.register([], function (_export, _context) {
   return {
     setters: [],
     execute: function () {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/get-module-name-option/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register("my custom module name", [], function (_export, __moduleName) {
+System.register("my custom module name", [], function (_export, _context) {
   return {
     setters: [],
     execute: function () {}

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/hoist-function-exports/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["./evens"], function (_export, __moduleName) {
+System.register(["./evens"], function (_export, _context) {
   var isEven, p, a, i, j, isOdd;
   return {
     setters: [function (_evens) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/imports-default/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo"], function (_export, __moduleName) {
+System.register(["foo"], function (_export, _context) {
   var foo, foo2;
   return {
     setters: [function (_foo) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/imports-glob/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo"], function (_export, __moduleName) {
+System.register(["foo"], function (_export, _context) {
   var foo;
   return {
     setters: [function (_foo) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/imports-mixing/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo"], function (_export, __moduleName) {
+System.register(["foo"], function (_export, _context) {
   var foo, xyz;
   return {
     setters: [function (_foo) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/imports-named/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo"], function (_export, __moduleName) {
+System.register(["foo"], function (_export, _context) {
   var bar, bar2, baz, baz2, baz3, xyz;
   return {
     setters: [function (_foo) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/imports/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo", "foo-bar", "./directory/foo-bar"], function (_export, __moduleName) {
+System.register(["foo", "foo-bar", "./directory/foo-bar"], function (_export, _context) {
   return {
     setters: [function (_foo) {}, function (_fooBar) {}, function (_directoryFooBar) {}],
     execute: function () {}

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/module-name/expected.js

@@ -1,11 +1,11 @@
 "use strict";
 
-System.register([], function (_export, __moduleName) {
+System.register([], function (_export, _context) {
   var name;
   return {
     setters: [],
     execute: function () {
-      _export("name", name = __moduleName);
+      _export("name", name = _context.id);
 
       _export("name", name);
     }

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/overview/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register(["foo", "foo-bar", "./directory/foo-bar"], function (_export, __moduleName) {
+System.register(["foo", "foo-bar", "./directory/foo-bar"], function (_export, _context) {
   var foo, foo2, bar, bar2, test2;
   return {
     setters: [function (_foo) {

packages/babel-plugin-transform-es2015-modules-systemjs/test/fixtures/systemjs/remap/expected.js

@@ -1,6 +1,6 @@
 "use strict";
 
-System.register([], function (_export, __moduleName) {
+System.register([], function (_export, _context) {
   var test, a, b, d;
   return {
     setters: [],