slack-go/slack v0.21.1

on GitHub

v0.21.1

Added

• MessageEvent channel type helpers — New ChannelTypeChannel, ChannelTypeGroup,
  ChannelTypeIM, and ChannelTypeMPIM constants plus IsChannel(), IsGroup(), IsIM(), and
  IsMpIM() convenience methods on MessageEvent. No more comparing raw strings to figure out where a
  message came from:

if ev.IsIM() {
    // handle direct message
}

Fixed

• MessageEvent doc typo — ChannelType documentation listed "mim" instead of the correct "mpim".
• Duplicate attachment/block serialization — MsgOptionAttachments and MsgOptionBlocks were serializing
  payloads twice (once for the response-URL JSON path, once for the form POST path). Serialization now
  happens once inside formSender.BuildRequestContext. (#1547)