So siehts ganz gut aus !

node_modules/core-js/fn/json/index.js

@@ -0,0 +1,2 @@
+var core = require('../../modules/_core');
+module.exports = core.JSON || (core.JSON = { stringify: JSON.stringify });

node_modules/core-js/fn/json/stringify.js

@@ -0,0 +1,5 @@
+var core = require('../../modules/_core');
+var $JSON = core.JSON || (core.JSON = { stringify: JSON.stringify });
+module.exports = function stringify(it) { // eslint-disable-line no-unused-vars
+  return $JSON.stringify.apply($JSON, arguments);
+};