fix: safer isUnauthorizedError type guard

src/UnauthorizedError.ts

@@ -15,6 +15,11 @@ export class UnauthorizedError extends Error {
   }
 }
 
-export const isUnauthorizedError = (error: any): error is UnauthorizedError => {
-  return error.data.type === 'UnauthorizedError'
+export const isUnauthorizedError = (
+  error: unknown
+): error is UnauthorizedError => {
+  return (
+    error instanceof UnauthorizedError &&
+    error.data.type === 'UnauthorizedError'
+  )
 }

src/authorize.ts

@@ -62,7 +62,7 @@ export const authorize = (options: AuthorizeOptions): SocketIOMiddleware => {
     }
     socket.encodedToken = encodedToken
     let keySecret: string | null = null
-    let decodedToken: any
+    let decodedToken: any = null
     if (typeof secret === 'string') {
       keySecret = secret
     } else {