Receive Slack events

Inbound events arrive through Slack Socket Mode and are normalized into shared ChannelEvent values before reaching your handler. See @anvia/slack for setup.

Start the handler

await channel.start(async (event) => {
  if (event.type === 'message') {
    console.log(event.text, event.attachments, event.conversation.threadId)
  }
  if (event.type === 'action') {
    console.log(event.actionId)
  }
  if (event.type === 'command') {
    console.log(event.name, event.text)
  }
})

Lifecycle events arrive too: message-edited carries the new text and attachments, message-deleted carries only the message ID, and reaction carries the emoji and a removed flag.

Socket envelopes are acknowledged before handler execution, so Slack does not re-deliver while the handler runs. Duplicate deliveries are suppressed with a bounded in-memory set of event IDs, and bot-authored events are filtered before the application handler runs. Handler failures are reported through onError without disconnecting.

On start, the adapter calls auth.test to resolve the team and bot user identity before accepting events. Direct messages and app-home conversations normalize with conversation kind 'direct', multi-party direct messages with 'group', and channels with 'channel'. A message is flagged mentionedBot for app_mention events or when its text contains the bot user mention.

Continue with

• Slack messaging — reply in threads and manage messages.
• Custom Slack transport — replace the transport and shut down cleanly.