From ecf8ef4381b5ab4cce5572df21054703991a04c7 Mon Sep 17 00:00:00 2001
From: NPJigaK <tyu_mom@yahoo.co.jp>
Date: Sun, 22 Oct 2023 04:50:54 +0900
Subject: [PATCH] Set Correct Initial Data for Difference Calculation

---
 lib/accessTwitch.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/accessTwitch.ts b/lib/accessTwitch.ts
index 62b25c8..eddb59a 100644
--- a/lib/accessTwitch.ts
+++ b/lib/accessTwitch.ts
@@ -110,10 +110,16 @@ export const useNowAllFollowers = () => {
     const resJson = await res.json();
     const followers = await fetchFollowers(resJson.data[0].id);
 
+    if (!localStorage.getItem(storedAllFollowersKey)) {
+      // addedUsers の差分が全てのユーザーにならないように、初期値はfollowers
+      localStorage.setItem(storedAllFollowersKey, JSON.stringify(followers));
+    }
+
     const result = await findDifference(
       followers,
-      JSON.parse(localStorage.getItem(storedAllFollowersKey) ?? "[]")
+      JSON.parse(localStorage.getItem(storedAllFollowersKey) as string)
     );
+
     debugLogger(result.removedUsers);
     debugLogger(result.addedUsers);
     setNowAllFollowers(followers);