Discord: honor explicit thread type

src/discord/send.creates-thread.test.ts

@@ -120,6 +120,24 @@ describe("sendMessageDiscord", () => {
     );
   });
 
+  it("respects explicit thread type for standalone threads", async () => {
+    const { rest, getMock, postMock } = makeRest();
+    getMock.mockResolvedValue({ type: ChannelType.GuildText });
+    postMock.mockResolvedValue({ id: "t1" });
+    await createThreadDiscord(
+      "chan1",
+      { name: "thread", type: ChannelType.PrivateThread },
+      { rest, token: "t" },
+    );
+    expect(getMock).toHaveBeenCalledWith(Routes.channel("chan1"));
+    expect(postMock).toHaveBeenCalledWith(
+      Routes.threads("chan1"),
+      expect.objectContaining({
+        body: expect.objectContaining({ name: "thread", type: ChannelType.PrivateThread }),
+      }),
+    );
+  });
+
   it("lists active threads by guild", async () => {
     const { rest, getMock } = makeRest();
     getMock.mockResolvedValue({ threads: [] });

src/discord/send.messages.ts

@@ -105,6 +105,9 @@ export async function createThreadDiscord(
   if (payload.autoArchiveMinutes) {
     body.auto_archive_duration = payload.autoArchiveMinutes;
   }
+  if (!payload.messageId && payload.type !== undefined) {
+    body.type = payload.type;
+  }
   let channelType: ChannelType | undefined;
   if (!payload.messageId) {
     // Only detect channel kind for route-less thread creation.