add number, null and undefined as valid return types (#8891)

chartjs · Apr 13, 2021 · f76ca01 · f76ca01
1 parent 95faa4f
commit f76ca01
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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