Update index.d.ts

types/passport/index.d.ts

@@ -26,8 +26,8 @@ declare global {
             isAuthenticated(): boolean;
             isUnauthenticated(): boolean;
         }
-        // tslint:disable-next-line:no-empty-interface
         interface User {
+            [_: string]: any;
         }
     }
 }