add strict mode plugin to module transforms

packages/babel-plugin-transform-es2015-modules-commonjs/package.json

@@ -8,9 +8,10 @@
   "dependencies": {
     "babel-types": "^6.0.2",
     "babel-runtime": "^6.0.2",
-    "babel-template": "^6.0.2"
+    "babel-template": "^6.0.2",
+    "babel-plugin-transform-strict-mode": "^6.0.2"
   },
   "keywords": [
     "babel-plugin"
   ]
-}
+}

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

@@ -118,6 +118,8 @@ export default function () {
   };
 
   return {
+    inherits: require("babel-plugin-transform-strict-mode"),
+
     visitor: {
       ThisExpression(path) {
         if (!path.findParent((path) => !path.is("shadow") && THIS_BREAK_KEYS.indexOf(path.type) >= 0)) {

packages/babel-plugin-transform-es2015-modules-systemjs/package.json

@@ -8,9 +8,10 @@
   "dependencies": {
     "babel-template": "^6.0.2",
     "babel-helper-hoist-variables": "^6.0.2",
-    "babel-runtime": "^6.0.2"
+    "babel-runtime": "^6.0.2",
+    "babel-plugin-transform-strict-mode": "^6.0.2"
   },
   "keywords": [
     "babel-plugin"
   ]
-}
+}

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

@@ -49,6 +49,8 @@ export default function ({ types: t }) {
   };
 
   return {
+    inherits: require("babel-plugin-transform-strict-mode"),
+    
     visitor: {
       Program: {
         exit(path) {