fix: IE11 add missing fetch and URL polyfills

fixes #875

package.json

@@ -117,6 +117,8 @@
     "tslint": "^5.13.1",
     "tslint-react": "^3.4.0",
     "typescript": "^3.3.3333",
+    "unfetch": "^4.1.0",
+    "url-polyfill": "^1.1.5",
     "webpack": "^4.29.6",
     "webpack-cli": "^3.2.3",
     "webpack-dev-server": "^3.2.1",

src/polyfills.ts

@@ -6,3 +6,6 @@ import 'core-js/fn/string/starts-with';
 
 import 'core-js/es6/map';
 import 'core-js/es6/symbol';
+
+import 'unfetch/polyfill/index';
+import 'url-polyfill';

yarn.lock

@@ -9599,6 +9599,11 @@ [email protected], uglify-js@^3.1.4:
     commander "~2.17.1"
     source-map "~0.6.1"
 
+unfetch@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/unfetch/-/unfetch-4.1.0.tgz#6ec2dd0de887e58a4dee83a050ded80ffc4137db"
+  integrity sha512-crP/n3eAPUJxZXM9T80/yv0YhkTEx2K1D3h7D1AJM6fzsWZrxdyRuLN0JH/dkZh1LNH8LxCnBzoPFCPbb2iGpg==
+
 unicode-canonical-property-names-ecmascript@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz#2619800c4c825800efdd8343af7dd9933cbe2818"
@@ -9699,6 +9704,11 @@ url-parse@^1.4.3:
     querystringify "^2.0.0"
     requires-port "^1.0.0"
 
+url-polyfill@^1.1.5:
+  version "1.1.5"
+  resolved "https://registry.yarnpkg.com/url-polyfill/-/url-polyfill-1.1.5.tgz#bec79b72b5407dba6d8cced2e32e4ab273aa9fb1"
+  integrity sha512-9XjIJ6nwrU+nGd8t90Ze0Zs7t8A+SU0gqsqPttj6j3zAVe5q0HFcuv37nDBdVSPpi4aTHTfbUF/i+ZVD+o2EbA==
+
 [email protected], url@^0.11.0:
   version "0.11.0"
   resolved "https://registry.yarnpkg.com/url/-/url-0.11.0.tgz#3838e97cfc60521eb73c525a8e55bfdd9e2e28f1"