feat(auth): implement user authentication system

backend/node_modules/logform/label.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const format = require('./format');
+
+/*
+ * function label (info)
+ * Returns a new instance of the label Format which adds the specified
+ * `opts.label` before the message. This was previously exposed as
+ * { label: 'my label' } to transports in `winston < 3.0.0`.
+ */
+module.exports = format((info, opts) => {
+  if (opts.message) {
+    info.message = `[${opts.label}] ${info.message}`;
+    return info;
+  }
+
+  info.label = opts.label;
+  return info;
+});