fix(ThreadChannel): Make ownerId always present

#10618 djs

src/structures/ThreadChannel.js

@@ -24,6 +24,12 @@ class ThreadChannel extends Channel {
      */
     this.guild = guild;
 
+    /**
+     * The id of the member who created this thread
+     * @type {Snowflake}
+     */
+    this.ownerId = data.owner_id;
+
     /**
      * The id of the guild the channel is in
      * @type {Snowflake}
@@ -117,16 +123,6 @@ class ThreadChannel extends Channel {
 
     this._createdTimestamp ??= this.type === 'GUILD_PRIVATE_THREAD' ? super.createdTimestamp : null;
 
-    if ('owner_id' in data) {
-      /**
-       * The id of the member who created this thread
-       * @type {?Snowflake}
-       */
-      this.ownerId = data.owner_id;
-    } else {
-      this.ownerId ??= null;
-    }
-
     if ('last_message_id' in data) {
       /**
        * The last message id sent in this thread, if one was sent

typings/index.d.ts

@@ -3371,7 +3371,7 @@ export class ThreadChannel extends TextBasedChannelMixin(Channel, ['fetchWebhook
   public messageCount: number | null;
   public members: ThreadMemberManager;
   public name: string;
-  public ownerId: Snowflake | null;
+  public ownerId: Snowflake;
   public readonly parent: TextChannel | NewsChannel | ForumChannel | MediaChannel | null;
   public parentId: Snowflake | null;
   public rateLimitPerUser: number | null;