some progress

node_modules/mongoose/lib/error/syncIndexes.js

@@ -0,0 +1,30 @@
+'use strict';
+
+/*!
+ * Module dependencies.
+ */
+
+const MongooseError = require('./mongooseError');
+
+/**
+ * SyncIndexes Error constructor.
+ *
+ * @param {String} message
+ * @param {String} errorsMap
+ * @inherits MongooseError
+ * @api private
+ */
+
+class SyncIndexesError extends MongooseError {
+  constructor(message, errorsMap) {
+    super(message);
+    this.errors = errorsMap;
+  }
+}
+
+Object.defineProperty(SyncIndexesError.prototype, 'name', {
+  value: 'SyncIndexesError'
+});
+
+
+module.exports = SyncIndexesError;