Alchemy.Cache.private_channel

You're seeing just the function private_channel, go back to Alchemy.Cache module for more information.
Link to this function

private_channel(channel_id)

Specs

private_channel(snowflake()) ::
  {:ok, Alchemy.Channel.dm_channel()} | {:error, String.t()}

Fetches a private_channel in the cache by id of the channel.

Takes a DMChannel id. Alternatively, user: user_id can be passed to find the private channel related to a user.