I've came up with solution very similar to Oliver's :)

Top `Page`(or `Screen`) update functions are getting the `Store` which is a 
top level app model. Alternative way is to have `mapToContext` function 
that receives some `Props` and `Store` and maps those to some useful 
context(it might be useful for both view and update functions, btw).

Each top-level `Page` update fn also returns an instance of `Action` that 
helps modifying the store.

On Monday, March 20, 2017 at 1:58:38 PM UTC+2, Eirik Sletteberg wrote:
>
> In larger Elm apps, it makes sense to divide Updaters so you can 
> package-by-feature.
> For example, a single page application could have updaters like this:
>
> - Configuration updater
> - Session updater
> - User Profile updater
> - User Settings updater
> - Content updater
> - Some other business specific updater
>
> The challenge is when there are dependencies between Updaters, for example 
> the User Profile model might need data from the Session model, the Session 
> updater might need to send messages to the User updater (Load user profile 
> when session is updated), or the Content updater may need to check for the 
> Session updater (get session ID to send as parameter to the API when 
> fetching content), or some business-specific updater may need to interact 
> with both the Content updater, the User updater, and the Configuration 
> updater.
>
> In Redux, one would use combineReducers to mount each reducer under its 
> own path, and then one can trigger actions across reducers. How would you 
> solve this in Elm?
>
>

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