Express addition

node_modules/core-js/modules/_inherit-if-required.js

@@ -0,0 +1,9 @@
+var isObject = require('./_is-object');
+var setPrototypeOf = require('./_set-proto').set;
+module.exports = function (that, target, C) {
+  var S = target.constructor;
+  var P;
+  if (S !== C && typeof S == 'function' && (P = S.prototype) !== C.prototype && isObject(P) && setPrototypeOf) {
+    setPrototypeOf(that, P);
+  } return that;
+};