Fix: Add Promise polyfill for IE11 because require.ensure requires it…

… in webpack 2

package.json

@@ -39,6 +39,7 @@
     "common-dir": "^1.0.1",
     "css-loader": "^0.28.1",
     "es6-object-assign": "~1.1.0",
+    "es6-promise": "^4.1.0",
     "escodegen": "^1.8.1",
     "findup": "^0.1.5",
     "function.name-polyfill": "^1.0.5",

src/index.js

@@ -1,3 +1,4 @@
+import './polyfills';
 import './styles';
 import React from 'react';
 import ReactDOM from 'react-dom';
@@ -13,11 +14,6 @@ import {
 } from './utils/utils';
 import StyleGuide from 'rsg-components/StyleGuide';
 
-// Polyfills
-import 'function.name-polyfill';
-import es6ObjectAssign from 'es6-object-assign';
-es6ObjectAssign.polyfill();
-
 // Examples code revision to rerender only code examples (not the whole page) when code changes
 let codeKey = 0;
 

src/polyfills.js

@@ -0,0 +1,8 @@
+// Function.name for IE11
+import 'function.name-polyfill';
+
+// Object.assign() for IE11
+import 'es6-object-assign/auto';
+
+// Promise to support webpack 2 require.ensure() in IE11
+import 'es6-promise/auto';

yarn.lock

@@ -1312,14 +1312,14 @@ browserify-zlib@^0.1.4:
   dependencies:
     pako "~0.2.0"
 
-browserslist@1.7.5, browserslist@^1.4.0:
+browserslist@1.7.5:
   version "1.7.5"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-1.7.5.tgz#eca4713897b51e444283241facf3985de49a9e2b"
   dependencies:
     caniuse-db "^1.0.30000624"
     electron-to-chromium "^1.2.3"
 
-browserslist@^1.3.6, browserslist@^1.5.2, browserslist@^1.7.6:
+browserslist@^1.3.6, browserslist@^1.4.0, browserslist@^1.5.2, browserslist@^1.7.6:
   version "1.7.7"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-1.7.7.tgz#0bd76704258be829b2398bb50e4b62d1a166b0b9"
   dependencies:
@@ -2395,6 +2395,10 @@ es6-object-assign@~1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/es6-object-assign/-/es6-object-assign-1.1.0.tgz#c2c3582656247c39ea107cb1e6652b6f9f24523c"
 
+es6-promise@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.1.0.tgz#dda03ca8f9f89bc597e689842929de7ba8cebdf0"
+
 es6-set@~0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/es6-set/-/es6-set-0.1.5.tgz#d2b3ec5d4d800ced818db538d28974db0a73ccb1"