npm and error messages

node_modules/core-js/modules/_new-promise-capability.js

@@ -0,0 +1,18 @@
+'use strict';
+// 25.4.1.5 NewPromiseCapability(C)
+var aFunction = require('./_a-function');
+
+function PromiseCapability(C) {
+  var resolve, reject;
+  this.promise = new C(function ($$resolve, $$reject) {
+    if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');
+    resolve = $$resolve;
+    reject = $$reject;
+  });
+  this.resolve = aFunction(resolve);
+  this.reject = aFunction(reject);
+}
+
+module.exports.f = function (C) {
+  return new PromiseCapability(C);
+};