refactor: centralize slack threading helpers

src/slack/types.ts

@@ -0,0 +1,38 @@
+export type SlackFile = {
+  id?: string;
+  name?: string;
+  mimetype?: string;
+  size?: number;
+  url_private?: string;
+  url_private_download?: string;
+};
+
+export type SlackMessageEvent = {
+  type: "message";
+  user?: string;
+  bot_id?: string;
+  subtype?: string;
+  username?: string;
+  text?: string;
+  ts?: string;
+  thread_ts?: string;
+  event_ts?: string;
+  parent_user_id?: string;
+  channel: string;
+  channel_type?: "im" | "mpim" | "channel" | "group";
+  files?: SlackFile[];
+};
+
+export type SlackAppMentionEvent = {
+  type: "app_mention";
+  user?: string;
+  bot_id?: string;
+  username?: string;
+  text?: string;
+  ts?: string;
+  thread_ts?: string;
+  event_ts?: string;
+  parent_user_id?: string;
+  channel: string;
+  channel_type?: "im" | "mpim" | "channel" | "group";
+};