Add comprehensive tests for role middleware and fix package dependencies

node_modules/workerpool/src/transfer.js

@@ -0,0 +1,12 @@
+/**
+ * The helper class for transferring data from the worker to the main thread.
+ *
+ * @param {Object} message The object to deliver to the main thread.
+ * @param {Object[]} transfer An array of transferable Objects to transfer ownership of.
+ */
+function Transfer(message, transfer) {
+  this.message = message;
+  this.transfer = transfer;
+}
+
+module.exports = Transfer;