Configring node js.

node_modules/core-js/library/modules/es6.string.starts-with.js

@@ -0,0 +1,18 @@
+// 21.1.3.18 String.prototype.startsWith(searchString [, position ])
+'use strict';
+var $export     = require('./_export')
+  , toLength    = require('./_to-length')
+  , context     = require('./_string-context')
+  , STARTS_WITH = 'startsWith'
+  , $startsWith = ''[STARTS_WITH];
+
+$export($export.P + $export.F * require('./_fails-is-regexp')(STARTS_WITH), 'String', {
+  startsWith: function startsWith(searchString /*, position = 0 */){
+    var that   = context(this, searchString, STARTS_WITH)
+      , index  = toLength(Math.min(arguments.length > 1 ? arguments[1] : undefined, that.length))
+      , search = String(searchString);
+    return $startsWith
+      ? $startsWith.call(that, search, index)
+      : that.slice(index, index + search.length) === search;
+  }
+});