Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/$.string-context.js

@@ -0,0 +1,8 @@
+// helper for String#{startsWith, endsWith, includes}
+var isRegExp = require('./$.is-regexp')
+  , defined  = require('./$.defined');
+
+module.exports = function(that, searchString, NAME){
+  if(isRegExp(searchString))throw TypeError('String#' + NAME + " doesn't accept regex!");
+  return String(defined(that));
+};