Type Alias MappedEffect 

pub type MappedEffect = Box<dyn FnOnce(Arc<ApplicationRunTime>) -> Pin<Box<dyn Future<Output = Result<Value, String>> + Send>> + Send>;

A type alias for a boxed, runnable effect. This is the “type-erased” unit of work that the dispatch logic can execute.

Aliased Type

pub struct MappedEffect(/* private fields */);