babel config for IE

Author: nkzawa

package.json

@@ -13,8 +13,10 @@
     "babel-plugin-transform-async-to-generator": "6.7.0",
     "babel-plugin-transform-class-properties": "6.6.0",
     "babel-plugin-transform-object-rest-spread": "6.6.5",
+    "babel-plugin-transform-proto-to-assign": "6.6.5",
     "babel-plugin-transform-runtime": "6.6.0",
     "babel-preset-es2015": "6.6.0",
+    "babel-preset-es2015-loose": "7.0.0",
     "babel-preset-react": "6.5.0",
     "babel-register": "6.7.2",
     "babel-runtime": "6.6.1",
@@ -39,12 +41,13 @@
   },
   "babel": {
     "presets": [
-      "es2015",
+      "es2015-loose",
       "react"
     ],
     "plugins": [
       "transform-class-properties",
-      "transform-object-rest-spread"
+      "transform-object-rest-spread",
+      "transform-proto-to-assign"
     ]
   },
   "ava": {