You're seeing just the function
join, go back to Slack.Web.Channels module for more information.
Joins a channel, creating it if needed.
name- Name of channel to join
Errors the API can return:
channel_not_found- Value passed for
is_archived- Channel has been archived.
name_taken- A channel cannot be created with the given name.
no_channel- Value passed for
restricted_action- A team preference prevents the authenticated user from creating channels.