npm and error messages

node_modules/regenerator-transform/src/util.js

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2014, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * https://raw.github.com/facebook/regenerator/master/LICENSE file. An
+ * additional grant of patent rights can be found in the PATENTS file in
+ * the same directory.
+ */
+
+import * as t from "babel-types";
+
+export function runtimeProperty(name) {
+  return t.memberExpression(
+    t.identifier("regeneratorRuntime"),
+    t.identifier(name),
+    false
+  );
+}
+
+export function isReference(path) {
+  return path.isReferenced() || path.parentPath.isAssignmentExpression({ left: path.node });
+}
+
+export function replaceWithOrRemove(path, replacement) {
+  if (replacement) {
+    path.replaceWith(replacement)
+  } else {
+    path.remove();
+  }
+}