Express addition

node_modules/core-js/modules/_shared.js

@@ -0,0 +1,12 @@
+var core = require('./_core');
+var global = require('./_global');
+var SHARED = '__core-js_shared__';
+var store = global[SHARED] || (global[SHARED] = {});
+
+(module.exports = function (key, value) {
+  return store[key] || (store[key] = value !== undefined ? value : {});
+})('versions', []).push({
+  version: core.version,
+  mode: require('./_library') ? 'pure' : 'global',
+  copyright: '© 2019 Denis Pushkarev (zloirock.ru)'
+});