From c12704c3014f71741aa707700c32a42df699f8e6 Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Wed, 28 Sep 2022 16:51:45 +0200
Subject: [PATCH] [fix] typings for #7863

---
 src/runtime/internal/dev.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/runtime/internal/dev.ts b/src/runtime/internal/dev.ts
index 02677172fa..32d14571d9 100644
--- a/src/runtime/internal/dev.ts
+++ b/src/runtime/internal/dev.ts
@@ -126,7 +126,7 @@ export function validate_void_dynamic_element(tag: undefined | string) {
 type Props = Record<string, any>;
 export interface SvelteComponentDev {
 	$set(props?: Props): void;
-	$on(event: string, callback: (event: any) => void): () => void;
+	$on(event: string, callback: ((event: any) => void) | null | undefined): () => void;
 	$destroy(): void;
 	[accessor: string]: any;
 }
@@ -196,7 +196,7 @@ export interface SvelteComponentTyped<
 	Slots extends Record<string, any> = any // eslint-disable-line @typescript-eslint/no-unused-vars
 > {
 	$set(props?: Partial<Props>): void;
-	$on<K extends Extract<keyof Events, string>>(type: K, callback: (e: Events[K]) => void): () => void;
+	$on<K extends Extract<keyof Events, string>>(type: K, callback: ((e: Events[K]) => void) | null | undefined): () => void;
 	$destroy(): void;
 	[accessor: string]: any;
 }