From 71fa51ef58526c9866040f64b35e75d9764d7475 Mon Sep 17 00:00:00 2001
From: toda <ytoda@d-forest-corp.com>
Date: Mon, 16 May 2022 15:17:22 +0900
Subject: [PATCH] Async getItem function may return null

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

diff --git a/src/index.ts b/src/index.ts
index 45d1871..527cf05 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,7 +3,7 @@ import { AtomEffect } from 'recoil'
 export interface PersistStorage {
   setItem(key: string, value: string): void | Promise<void>
   mergeItem?(key: string, value: string): Promise<void>
-  getItem(key: string): null | string | Promise<string>
+  getItem(key: string): null | string | Promise<string | null>
 }
 
 export interface PersistConfiguration {
@@ -78,7 +78,7 @@ export const recoilPersist = (
       return parseState(toParse)
     }
     if (typeof toParse.then === 'function') {
-      return toParse.then(parseState)
+      return toParse.then(state => state === null ? '{}' : state).then(parseState)
     }
 
     return {}