From 4865793c03ada33ed6e5e90c849366af1029d7f9 Mon Sep 17 00:00:00 2001
From: Abhishek Datta <abdatta@iitk.ac.in>
Date: Tue, 27 Apr 2021 16:33:52 +0530
Subject: [PATCH] Set listener parameter of once() as optional (#23)

Solves #22
---
 emitter.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/emitter.d.ts b/emitter.d.ts
index b2b32e9..0f75bb0 100644
--- a/emitter.d.ts
+++ b/emitter.d.ts
@@ -18,7 +18,7 @@ declare class EventEmitter {
     emit(type: TEventType, ...args: any[]): Promise<any>;
     addListener(type: TEventType, listener: TListener): Promise<any>;
     prependListener(type: TEventType, listener: TListener): Promise<any>;
-    once(type: TEventType, listener: TListener): Promise<any>;
+    once(type: TEventType, listener?: TListener): Promise<any>;
     prependOnceListener(type: TEventType, listener: TListener): Promise<any>;
     removeListener(type: TEventType, listener: TListener): Promise<any>;
     removeAllListeners(type: string | symbol): Promise<any>;