Configring node js.

node_modules/core-js/modules/es6.string.big.js

@@ -0,0 +1,7 @@
+'use strict';
+// B.2.3.3 String.prototype.big()
+require('./_string-html')('big', function(createHTML){
+  return function big(){
+    return createHTML(this, 'big', '', '');
+  }
+});