ThreadBroadcastMessageEvent is missing `bot_id`

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@sean0407 已经在做这个了。

开始于 2026年10月13日。

  • #2769 来自 @sean0407 —— 未关闭

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Issue 类型
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技术栈
node.js, typescript
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api

调研方向

该 issue 指向 packages/types/src/events/message.ts，具体是第 276–300 行附近的 ThreadBroadcastMessageEvent 定义。将该类型与 GenericMessageEvent 一起阅读，并检查是否有相关的类型测试。当广播事件上表示了 bot_id?: string，且类型接受访问 event.bot_id 时，即为完成。

由索引模型根据 Issue 内容生成。

描述

untriaged
Package

@slack/types

SDK Version

@slack/[email protected]

Node.js Version

N/A (type definition issue)

Operating System

No response

Steps to Reproduce
  1. Set up an app subscribed to the message.channels event.
  2. Start a thread as a user in a channel where the app is a member.
  3. As the bot, reply in that thread with chat.postMessage({ channel, thread_ts, text, reply_broadcast: true }).
  4. Inspect the payload of the message event the app receives for that reply.

In TypeScript, the following code does not compile:

import type { ThreadBroadcastMessageEvent } from "@slack/types";

function isFromBot(event: ThreadBroadcastMessageEvent) {
  return !!event.bot_id; // error TS2339: Property 'bot_id' does not exist on type 'ThreadBroadcastMessageEvent'
}
Expected Result

ThreadBroadcastMessageEvent defines bot_id?: string, like GenericMessageEvent does. Slack sends this field, so we can check whether the broadcast reply itself was posted by a bot without a type assertion.

Actual Result

Slack sends a message event with subtype: "thread_broadcast". The event includes a top-level bot_id:

{
  "type": "message",
  "subtype": "thread_broadcast",
  "user": "U0XXXXXXX",
  "bot_id": "B0XXXXXXX",
  "app_id": "A0XXXXXXX",
  "text": "broadcast test",
  "ts": "1791786680.944589",
  "thread_ts": "1791786656.190749",
  "channel": "C0XXXXXXX",
  "channel_type": "channel",
  "event_ts": "1791786680.944589",
  "root": { "user": "U0YYYYYYY", "ts": "1791786656.190749", "reply_count": 2, ... },
  "blocks": [ ... ]
}

However, ThreadBroadcastMessageEvent does not define bot_id, even after #2763:

https://github.com/slackapi/node-slack-sdk/blob/e02e7feeb500bfde1f947401a639633e42ce2f91/packages/types/src/events/message.ts#L276-L300

The only bot_id reachable from this type is root.bot_id, which describes the thread parent, not the broadcast reply. Code that uses root.bot_id to detect bot messages gets both cases wrong: a user's broadcast in a bot-started thread looks like a bot message, and a bot's broadcast in a user-started thread looks like a user message.

This is a follow-up to #2762, which covered other missing fields on the same type.

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