Alchemy.Events.on_message

You're seeing just the macro on_message, go back to Alchemy.Events module for more information.
Link to this macro

on_message(func)

(macro)

Registers a handle triggering whenever a message gets sent.

args : Alchemy.Message.t

Examples

use Alchemy.Events

Events.on_message(:ping)
def ping(msg), do: IO.inspect msg.content