add: webhook thread support

src/helpers/webhooks/send_webhook.ts

@@ -66,9 +66,9 @@ export async function sendWebhook(
 
   const result = await rest.runMethod<Message>(
     "post",
-    `${endpoints.WEBHOOK(webhookId, webhookToken)}${
-      options.wait ? "?wait=true" : ""
-    }`,
+    `${endpoints.WEBHOOK(webhookId, webhookToken)}?wait=${
+      options.wait ? "true" : "false"
+    }${options.threadId ? `&thread_id=${options.threadId}` : ""}`,
     {
       ...options,
       allowed_mentions: options.allowedMentions,

src/types/webhooks/execute_webhook.ts

@@ -7,6 +7,8 @@ import { SnakeCasedPropertiesDeep } from "../util.ts";
 export interface ExecuteWebhook {
   /** Waits for server confirmation of message send before response, and returns the created message body (defaults to `false`; when `false` a message that is not saved does not return an error) */
   wait?: boolean;
+  /** Send a message to the specified thread within a webhook's channel. The thread will automatically be unarchived. */
+  threadId?: bigint;
   /** The message contents (up to 2000 characters) */
   content?: string;
   /** Override the default username of the webhook */