From f955ebb69b1a9dd4dbda8221ee7dde6be6e37224 Mon Sep 17 00:00:00 2001
From: Caio Lins <clins@ksmartsolutions.jp>
Date: Tue, 5 Nov 2024 18:20:42 +0900
Subject: [PATCH] [charts] Allow `SeriesValueFormatter` to return `null` value
 (#15057)

---
 packages/x-charts/src/models/seriesType/common.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/x-charts/src/models/seriesType/common.ts b/packages/x-charts/src/models/seriesType/common.ts
index 471e06a7367f..356c8a4b4b23 100644
--- a/packages/x-charts/src/models/seriesType/common.ts
+++ b/packages/x-charts/src/models/seriesType/common.ts
@@ -13,7 +13,7 @@ export type SeriesValueFormatterContext = {
 export type SeriesValueFormatter<TValue> = (
   value: TValue,
   context: SeriesValueFormatterContext,
-) => string;
+) => string | null;
 
 export type CommonSeriesType<TValue> = {
   id?: SeriesId;
@@ -22,7 +22,7 @@ export type CommonSeriesType<TValue> = {
    * Formatter used to render values in tooltip or other data display.
    * @param {TValue} value The series' value to render.
    * @param {SeriesValueFormatterContext} context The rendering context of the value.
-   * @returns {string} The string to display.
+   * @returns {string | null} The string to display or null if the value should not be shown.
    */
   valueFormatter?: SeriesValueFormatter<TValue>;
   /**