fix: thread member update event

bot.ts

@@ -183,6 +183,7 @@ export function createEventHandlers(
     debug: events.debug ?? ignore,
     threadCreate: events.threadCreate ?? ignore,
     threadDelete: events.threadDelete ?? ignore,
+    threadMemberUpdate: events.threadMemberUpdate ?? ignore,
     threadMembersUpdate: events.threadMembersUpdate ?? ignore,
     threadUpdate: events.threadUpdate ?? ignore,
     scheduledEventCreate: events.scheduledEventCreate ?? ignore,
@@ -455,6 +456,12 @@ export interface EventHandlers {
   debug: (text: string, ...args: any[]) => unknown;
   threadCreate: (bot: Bot, thread: Channel) => unknown;
   threadDelete: (bot: Bot, thread: Channel) => unknown;
+  threadMemberUpdate: (bot: Bot, payload: {
+    id: bigint;
+    guildId: bigint;
+    joinedAt: number;
+    flags: number;
+  }) => unknown;
   threadMembersUpdate: (
     bot: Bot,
     payload: {

handlers/channels/THREAD_MEMBER_UPDATE.ts

@@ -0,0 +1,13 @@
+import { Bot } from "../../bot.ts";
+import { DiscordGatewayPayload, DiscordThreadMemberUpdate } from "../../types/discord.ts";
+
+export async function handleThreadMemberUpdate(bot: Bot, data: DiscordGatewayPayload) {
+  const payload = data.d as DiscordThreadMemberUpdate;
+
+  bot.events.threadMemberUpdate(bot, {
+    id: bot.transformers.snowflake(payload.id),
+    guildId: bot.transformers.snowflake(payload.guild_id),
+    joinedAt: Date.parse(payload.joined_at),
+    flags: payload.flags,
+  });
+}

types/discord.ts

@@ -2023,7 +2023,7 @@ export interface DiscordMessageDelete {
   guild_id?: string;
 }
 
-// TODO: add docs link
+/** https://discord.com/developers/docs/topics/gateway#thread-members-update-thread-members-update-event-fields */
 export interface DiscordThreadMembersUpdate {
   /** The id of the thread */
   id: string;
@@ -2037,6 +2037,18 @@ export interface DiscordThreadMembersUpdate {
   member_count: number;
 }
 
+/** https://discord.com/developers/docs/topics/gateway#thread-member-update */
+export interface DiscordThreadMemberUpdate {
+  /** The id of the thread */
+  id: string;
+  /** The id of the guild */
+  guild_id: string;
+  /** The timestamp when the bot joined this thread. */
+  joined_at: string;
+  /** The flags this user has for this thread. Not useful for bots. */
+  flags: number;
+}
+
 /** https://discord.com/developers/docs/topics/gateway#guild-role-create */
 export interface DiscordGuildRoleCreate {
   /** The id of the guild */