npm and error messages

node_modules/babel-runtime/helpers/defineProperty.js

@@ -0,0 +1,24 @@
+"use strict";
+
+exports.__esModule = true;
+
+var _defineProperty = require("../core-js/object/define-property");
+
+var _defineProperty2 = _interopRequireDefault(_defineProperty);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+exports.default = function (obj, key, value) {
+  if (key in obj) {
+    (0, _defineProperty2.default)(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+
+  return obj;
+};