Use core-js for polyfills (#671)

* Use core-js for polyfills

* Remove DOM polyfill, it's not used

* Only polyfill parts of ES2015 we currently use

Author: mmermerkaya

packages/polyfill/index.ts

@@ -14,6 +14,13 @@
  * limitations under the License.
  */
 
-import './src/polyfills/promise';
-import './src/shims/Array';
-import './src/shims/String';
+// Fetch
+import 'whatwg-fetch';
+
+// Promise
+import 'promise-polyfill/src/polyfill';
+
+// ES6
+import 'core-js/fn/array/find';
+import 'core-js/fn/array/find-index';
+import 'core-js/fn/string/starts-with';

packages/polyfill/package.json

@@ -13,12 +13,11 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
-    "promise-polyfill": "^7.1.0",
-    "tslib": "^1.9.0",
+    "core-js": "^2.5.5",
+    "promise-polyfill": "^7.1.2",
     "whatwg-fetch": "^2.0.3"
   },
   "devDependencies": {
-    "@types/node": "^9.4.6",
     "rollup": "^0.57.1",
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-node-resolve": "^3.3.0",

packages/polyfill/src/polyfills/fetch.ts

@@ -2448,6 +2448,10 @@ core-js@^2.0.0, core-js@^2.2.0, core-js@^2.4.0:
   version "2.5.3"
   resolved "https://registry.npmjs.org/core-js/-/core-js-2.5.3.tgz#8acc38345824f16d8365b7c9b4259168e8ed603e"
 
+core-js@^2.5.5:
+  version "2.5.5"
+  resolved "https://registry.npmjs.org/core-js/-/core-js-2.5.5.tgz#b14dde936c640c0579a6b50cabcc132dd6127e3b"
+
 core-js@~2.3.0:
   version "2.3.0"
   resolved "https://registry.npmjs.org/core-js/-/core-js-2.3.0.tgz#fab83fbb0b2d8dc85fa636c4b9d34c75420c6d65"
@@ -8234,9 +8238,9 @@ promise-polyfill@^6.0.1:
   version "6.1.0"
   resolved "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-6.1.0.tgz#dfa96943ea9c121fca4de9b5868cb39d3472e057"
 
-promise-polyfill@^7.1.0:
-  version "7.1.0"
-  resolved "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-7.1.0.tgz#4d749485b44577c14137591c6f36e5d7e2dd3378"
+promise-polyfill@^7.1.2:
+  version "7.1.2"
+  resolved "https://registry.npmjs.org/promise-polyfill/-/promise-polyfill-7.1.2.tgz#ab05301d8c28536301622d69227632269a70ca3b"
 
 [email protected]:
   version "1.0.0"