From e11bdfa2d011a04ae91382b52f168d619501597b Mon Sep 17 00:00:00 2001
From: Thomas Toye <thomas@toye.io>
Date: Thu, 15 Apr 2021 07:28:44 +0200
Subject: [PATCH] Fix callback typing (#342)

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

diff --git a/types/index.d.ts b/types/index.d.ts
index c284280f..c2cc544e 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -71,7 +71,7 @@ declare namespace schema {
 
 type Schema = Type | schema.AvroSchema;
 
-type Callback<V, Err = any> = (err: Err, value: V) => void;
+type Callback<V, Err = any> = (err: Err | null, value?: V) => void;
 
 
 type Codec = (buffer: Buffer, callback: Callback<Buffer>) => void;