refactor: add ie polyfills

Author: xidedix

src/index.js

@@ -1,5 +1,6 @@
 import 'react-app-polyfill/ie9'; // For IE 9-11 support
-import 'react-app-polyfill/ie11'; // For IE 11 support
+import 'react-app-polyfill/stable';
+// import 'react-app-polyfill/ie11'; // For IE 11 support
 import './polyfill'
 import React from 'react';
 import ReactDOM from 'react-dom';

src/polyfill.js

@@ -1,6 +1,8 @@
 /*
 * required polyfills
 */
+import "core-js";
+import 'core-js/features/set/map';
 
 /** IE9, IE10 and IE11 requires all of the following polyfills. **/
 // import 'core-js/es6/symbol'
@@ -12,12 +14,12 @@
 // import 'core-js/es6/math'
 // import 'core-js/es6/string'
 // import 'core-js/es6/date'
-import 'core-js/es6/array'
+// import 'core-js/es6/array'
 // import 'core-js/es6/regexp'
-import 'core-js/es6/map'
+// import 'core-js/es6/map'
 // import 'core-js/es6/weak-map'
-import 'core-js/es6/set'
-import 'core-js/es7/object'
+// import 'core-js/es6/set'
+// import 'core-js/es7/object'
 
 /** IE10 and IE11 requires the following for the Reflect API. */
 // import 'core-js/es6/reflect'