feat(auth): implement user authentication system

backend/node_modules/@sinonjs/commons/lib/index.js

@@ -0,0 +1,14 @@
+"use strict";
+
+module.exports = {
+    global: require("./global"),
+    calledInOrder: require("./called-in-order"),
+    className: require("./class-name"),
+    deprecated: require("./deprecated"),
+    every: require("./every"),
+    functionName: require("./function-name"),
+    orderByFirstCall: require("./order-by-first-call"),
+    prototypes: require("./prototypes"),
+    typeOf: require("./type-of"),
+    valueToString: require("./value-to-string"),
+};