You can't, discussed already here:

https://groups.google.com/forum/#!topic/elm-discuss/BFS03hbiT6A

As I said there it seems like a reasonable thing to want to do.

On Wednesday, June 8, 2016 at 5:02:30 PM UTC+10, Petr Huřťák wrote:
>
> Hi,
>
> I am trying to create outgoing (Elm -> JS) port, so far everything works 
> as expected with this code:
>
> port portName : String -> Cmd msg
>
>
> But when I try to create port without parameters
>
> port portName : Cmd msg
>
>
> it doesen't provide helpful message
>
> Port `portName` has an invalid type.
>
>
>> 4| port portName : Cmd msg
>
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> You are saying it should be:
>
>
>>     Platform.Cmd.Cmd msg
>
>
>> But you need to use the particular format described here:
>
> <http://guide.elm-lang.org/effect_managers/>
>
>
>> Detected errors in 1 module. 
>
>

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