From ab0992bd548d555dabbfb22aa03a9c8df7f1ff50 Mon Sep 17 00:00:00 2001
From: Dom Parfitt <dom.parfitt@gmail.com>
Date: Mon, 15 Oct 2018 14:20:20 +0100
Subject: [PATCH] Made parameter optional

---
 types/d3-graphviz/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/d3-graphviz/index.d.ts b/types/d3-graphviz/index.d.ts
index 0ccece31cf..bd2aac491a 100644
--- a/types/d3-graphviz/index.d.ts
+++ b/types/d3-graphviz/index.d.ts
@@ -262,7 +262,7 @@ declare module 'd3-graphviz' {
          * 
          * @param callback 
          */
-        attributer(callback: Function | null): this;
+        attributer(callback?: Function): this;
 
         //Accessing Extracted Data
         /**