remove strict module transformers

lib/6to5/transformation/modules/_strict.js

@@ -1,14 +0,0 @@
-"use strict";
-
-var util = require("../../util");
-
-module.exports = function (Parent) {
-  var Constructor = function () {
-    this.noInteropExport = true;
-    Parent.apply(this, arguments);
-  };
-
-  util.inherits(Constructor, Parent);
-
-  return Constructor;
-};

lib/6to5/transformation/modules/amd.js

@@ -107,7 +107,7 @@ AMDFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
 };
 
 AMDFormatter.prototype.exportDeclaration = function (node) {
-  if (node.default && !this.noInteropExport) {
+  if (node.default) {
     this.passModuleArg = true;
   }
 

lib/6to5/transformation/modules/common-strict.js

@@ -1,3 +0,0 @@
-"use strict";
-
-module.exports = require("./_strict")(require("./common"));

lib/6to5/transformation/modules/common.js

@@ -67,7 +67,7 @@ CommonJSFormatter.prototype.importDeclaration = function (node, nodes) {
 };
 
 CommonJSFormatter.prototype.exportDeclaration = function (node, nodes) {
-  if (node.default && !this.noInteropRequire && !this.noInteropExport) {
+  if (node.default && !this.noInteropRequire) {
     var declar = node.declaration;
     var assign;
 

lib/6to5/transformation/modules/umd-strict.js

@@ -1,3 +0,0 @@
-"use strict";
-
-module.exports = require("./_strict")(require("./umd"));

lib/6to5/transformation/transform.js

@@ -38,14 +38,11 @@ transform._ensureTransformerNames = function (type, keys) {
 transform.transformers = {};
 
 transform.moduleFormatters = {
-  commonStrict: require("./modules/common-strict"),
-  umdStrict:    require("./modules/umd-strict"),
-  amdStrict:    require("./modules/amd-strict"),
-  common:       require("./modules/common"),
-  system:       require("./modules/system"),
-  ignore:       require("./modules/ignore"),
-  amd:          require("./modules/amd"),
-  umd:          require("./modules/umd")
+  common: require("./modules/common"),
+  system: require("./modules/system"),
+  ignore: require("./modules/ignore"),
+  amd:    require("./modules/amd"),
+  umd:    require("./modules/umd")
 };
 
 _.each({