turn function.nix into a reflective type

deployment/data-model.nix

@@ -15,7 +15,7 @@ let
     functionTo
     ;
 
-  functionType = import ./function.nix;
+  functionType = import ./function.nix { inherit lib; };
   application-resources = submodule {
     options.resources = mkOption {
       # TODO: maybe transpose, and group the resources by type instead
@@ -110,7 +110,7 @@ in
             # TODO(@fricklerhandwerk): this needs a better name, it's just the type
             config-mapping = mkOption {
               description = "Function type for the mapping from application configuration to required resources";
-              type = submodule functionType;
+              type = functionType;
               readOnly = true;
               default = {
                 input-type = submodule application.config.module;
@@ -146,7 +146,7 @@ in
             };
             resource-mapping = mkOption {
               description = "Function type for the mapping from resources to a (NixOps4) deployment";
-              type = submodule functionType;
+              type = functionType;
               readOnly = true;
               default = {
                 input-type = application-resources;

deployment/function.nix

@@ -1,7 +1,7 @@
 /**
   Modular function type
 */
-{ config, lib, ... }:
+{ lib, ... }:
 let
   inherit (lib) mkOption types;
   inherit (types)
@@ -10,6 +10,8 @@ let
     optionType
     ;
 in
+submodule (
+  { config, ... }:
   {
     options = {
       input-type = mkOption {
@@ -34,3 +36,4 @@ in
       };
     };
   }
+)