Module type Deferred_intf.Deferred_map

module type Deferred_map = sig .. end

type ('k, 'v) t 

val filter_mapi : ('k, 'v1) t ->
       f:(key:'k -> data:'v1 -> 'v2 option Deferred_intf.Deferred.t) ->
       ('k, 'v2) t Deferred_intf.Deferred.t