From 9af54f5a6e8b4d42176a16dee81419a0cbceb3c4 Mon Sep 17 00:00:00 2001
From: Kira <Kira@fanruan.com>
Date: Wed, 21 Apr 2021 21:57:34 +0800
Subject: [PATCH] =?UTF-8?q?=E6=97=A0jira=E4=BB=BB=E5=8A=A1=20refactor:=20?=
 =?UTF-8?q?=E4=BF=AE=E6=94=B9=E5=A3=B0=E6=98=8E?=
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---
 typescript/core/ob.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/typescript/core/ob.ts b/typescript/core/ob.ts
index 893280633..54b10f8ba 100644
--- a/typescript/core/ob.ts
+++ b/typescript/core/ob.ts
@@ -21,7 +21,7 @@ export interface _OB {
 
     on(eventName: string, fn: Function): Function;
 
-    once(eventName: string, fn: Function): void;
+    once(eventName: string, fn?: Function): void;
 
     un(eName: string, fn: Function): void;