From e3aeab8122f6be66fd45b457eb1252a4cbe584cd Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Wed, 12 Apr 2023 17:02:54 +0900
Subject: [PATCH] fix type

---
 packages/backend/src/misc/cache.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/backend/src/misc/cache.ts b/packages/backend/src/misc/cache.ts
index d35414acf7..f413246a1f 100644
--- a/packages/backend/src/misc/cache.ts
+++ b/packages/backend/src/misc/cache.ts
@@ -8,7 +8,7 @@ export class RedisKVCache<T> {
 	private memoryCache: MemoryKVCache<T>;
 	private fetcher: (key: string) => Promise<T>;
 	private toRedisConverter: (value: T) => string;
-	private fromRedisConverter: (value: string) => T;
+	private fromRedisConverter: (value: string) => T | undefined;
 
 	constructor(redisClient: RedisKVCache<T>['redisClient'], name: RedisKVCache<T>['name'], opts: {
 		lifetime: RedisKVCache<T>['lifetime'];
@@ -92,7 +92,7 @@ export class RedisSingleCache<T> {
 	private memoryCache: MemorySingleCache<T>;
 	private fetcher: () => Promise<T>;
 	private toRedisConverter: (value: T) => string;
-	private fromRedisConverter: (value: string) => T;
+	private fromRedisConverter: (value: string) => T | undefined;
 
 	constructor(redisClient: RedisSingleCache<T>['redisClient'], name: RedisSingleCache<T>['name'], opts: {
 		lifetime: RedisSingleCache<T>['lifetime'];