feat(Webhook): allow setting appliedTags on send()

#10027 backport

src/structures/MessagePayload.js

@@ -145,10 +145,12 @@ class MessagePayload {
     let username;
     let avatarURL;
     let threadName;
+    let appliedTags;
     if (isWebhook) {
       username = this.options.username ?? this.target.name;
       if (this.options.avatarURL) avatarURL = this.options.avatarURL;
       if (this.options.threadName) threadName = this.options.threadName;
+      if (this.options.appliedTags) appliedTags = this.options.appliedTags;
     }
 
     let flags;
@@ -231,6 +233,7 @@ class MessagePayload {
       attachments: this.options.attachments,
       sticker_ids: this.options.stickers?.map(sticker => sticker.id ?? sticker),
       thread_name: threadName,
+      applied_tags: appliedTags,
       poll: this.options.poll instanceof MessagePoll ? this.options.poll.toJSON() : this.options.poll,
     };
     return this;

src/structures/Webhook.js

@@ -118,6 +118,8 @@ class Webhook {
    * <info>For interaction webhooks, this property is ignored</info>
    * @property {string} [threadName] Name of the thread to create (only available if webhook is in a forum channel)
    * @property {MessageFlags} [flags] Which flags to set for the message. Only `SUPPRESS_EMBEDS` can be set.
+   * @property {Snowflake[]} [appliedTags]
+   * The tags to apply to the created thread (only available if the webhook is in a forum channel)
    */
 
   /**

typings/index.d.ts

@@ -7589,6 +7589,7 @@ export interface WebhookMessageOptions extends Omit<MessageOptions, 'reply' | 's
   avatarURL?: string;
   threadId?: Snowflake;
   threadName?: string;
+  appliedTags?: Snowflake[];
 }
 
 export type WebhookType = keyof typeof WebhookTypes;