From ab8bf0f4d2a50cd85cf8b2aa1d4e2ea93872807b Mon Sep 17 00:00:00 2001
From: Jiralite <33201955+Jiralite@users.noreply.github.com>
Date: Sat, 29 Jun 2024 07:48:32 +0100
Subject: [PATCH] fix(GuildMemberManager): Fix data type check for `add()`
 method (#10338)

fix(GuildMemberManager): fix data type check

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
---
 packages/discord.js/src/managers/GuildMemberManager.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/discord.js/src/managers/GuildMemberManager.js b/packages/discord.js/src/managers/GuildMemberManager.js
index 76443f134..909ac6213 100644
--- a/packages/discord.js/src/managers/GuildMemberManager.js
+++ b/packages/discord.js/src/managers/GuildMemberManager.js
@@ -128,8 +128,9 @@ class GuildMemberManager extends CachedManager {
       resolvedOptions.roles = resolvedRoles;
     }
     const data = await this.client.rest.put(Routes.guildMember(this.guild.id, userId), { body: resolvedOptions });
-    // Data is an empty Uint8Array if the member is already part of the guild.
-    return data instanceof Uint8Array
+
+    // Data is an empty array buffer if the member is already part of the guild.
+    return data instanceof ArrayBuffer
       ? options.fetchWhenExisting === false
         ? null
         : this.fetch(userId)