From 0120b6fa1f4af5c25048b23d7b0a8fde81ed902b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Akseli=20K=C3=A4ppi?= <akseli.kappi@gmail.com>
Date: Sat, 22 May 2021 14:16:54 +0300
Subject: [PATCH] Add optional error parameter to listencallback

---
 packages/polka/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/polka/index.d.ts b/packages/polka/index.d.ts
index fbee9bf..1eb4d18 100644
--- a/packages/polka/index.d.ts
+++ b/packages/polka/index.d.ts
@@ -4,7 +4,7 @@ import type { ParsedURL } from '@polka/url';
 import type Trouter from 'trouter';
 
 type Promisable<T> = Promise<T> | T;
-type ListenCallback = () => Promisable<void>;
+type ListenCallback = (err?: string | IError) => Promisable<void>;
 
 export interface IError extends Error {
 	code?: number;