lib.types.lazyAttrsOf

The following is the current implementation of this function.

lazyAttrsOf = elemType: mkOptionType rec {
      name = "lazyAttrsOf";
      description = "lazy attribute set of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
      descriptionClass = "composite";
      check = isAttrs;
      merge = loc: defs:
        zipAttrsWith (name: defs:
          let merged = mergeDefinitions (loc ++ [name]) elemType defs;
          # mergedValue will trigger an appropriate error when accessed
          in merged.optionalValue.value or elemType.emptyValue.value or merged.mergedValue
        )
        # Push down position info.
        (map (def: mapAttrs (n: v: { inherit (def) file; value = v; }) def.value) defs);
      emptyValue = { value = {}; };
      getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
      getSubModules = elemType.getSubModules;
      substSubModules = m: lazyAttrsOf (elemType.substSubModules m);
      functor = (defaultFunctor name) // { wrapped = elemType; };
      nestedTypes.elemType = elemType;
    };