Porting Polyfills Fix (missing in master) (#668)

* Fix polyfills for fetch

* [AUTOMATED]: Prettier Code Styling

* [AUTOMATED]: License Headers

* Removing legacy file

Author: Josh Crowther

packages/polyfill/src/polyfills/fetch.ts

@@ -0,0 +1,22 @@
+/**
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import './promise';
+import { global } from './global';
+
+(self => {
+  require('whatwg-fetch');
+})(global);

packages/polyfill/src/polyfills/global.ts

@@ -0,0 +1,30 @@
+/**
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const __global = (() => {
+  if (typeof global !== 'undefined') {
+    return global;
+  }
+  if (typeof window !== 'undefined') {
+    return window;
+  }
+  if (typeof self !== 'undefined') {
+    return self;
+  }
+  throw new Error('unable to locate global object');
+})();
+
+export const global = __global;

packages/polyfill/src/polyfills/promise.ts

@@ -14,21 +14,10 @@
  * limitations under the License.
  */
 
-const __global = (() => {
-  if (typeof global !== 'undefined') {
-    return global;
-  }
-  if (typeof window !== 'undefined') {
-    return window;
-  }
-  if (typeof self !== 'undefined') {
-    return self;
-  }
-  throw new Error('unable to locate global object');
-})();
+import { global } from './global';
 
 // Polyfill Promise
 if (typeof Promise === 'undefined') {
   // HACK: TS throws an error if I attempt to use 'dot-notation'
-  __global['Promise'] = require('promise-polyfill') as PromiseConstructor;
+  global['Promise'] = require('promise-polyfill') as PromiseConstructor;
 }