Cqrs.Command.before_dispatch

You're seeing just the callback before_dispatch, go back to Cqrs.Command module for more information.

before_dispatch( command, keyword )

before_dispatch(
  command(),
  keyword()
) :: {:ok, command()} | {:error, any()}

This callback is intended to be used as a last chance to do any validation that performs IO.

This callback is optional.

Invoked before handle_dispatch/2.