npm and error messages

node_modules/babel-traverse/lib/cache.js

@@ -0,0 +1,30 @@
+"use strict";
+
+exports.__esModule = true;
+exports.scope = exports.path = undefined;
+
+var _weakMap = require("babel-runtime/core-js/weak-map");
+
+var _weakMap2 = _interopRequireDefault(_weakMap);
+
+exports.clear = clear;
+exports.clearPath = clearPath;
+exports.clearScope = clearScope;
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var path = exports.path = new _weakMap2.default();
+var scope = exports.scope = new _weakMap2.default();
+
+function clear() {
+  clearPath();
+  clearScope();
+}
+
+function clearPath() {
+  exports.path = path = new _weakMap2.default();
+}
+
+function clearScope() {
+  exports.scope = scope = new _weakMap2.default();
+}