From f76ca010e8466cb83c3c208cc3304a2064d4743f Mon Sep 17 00:00:00 2001
From: Jacco van den Berg <39033624+LeeLenaleee@users.noreply.github.com>
Date: Tue, 13 Apr 2021 21:24:59 +0200
Subject: [PATCH] add number, null and undefined as valid return types (#8891)

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

diff --git a/types/index.esm.d.ts b/types/index.esm.d.ts
index 51ec1f7f6..6d6fa09bf 100644
--- a/types/index.esm.d.ts
+++ b/types/index.esm.d.ts
@@ -2696,7 +2696,7 @@ export interface TickOptions {
   /**
    * Returns the string representation of the tick value as it should be displayed on the chart. See callback.
    */
-  callback: (tickValue: number | string, index: number, ticks: Tick[]) => string;
+  callback: (tickValue: number | string, index: number, ticks: Tick[]) => string | number | null | undefined;
   /**
    * If true, show tick labels.
    * @default true
-- 
2.47.3