feat: maybe as union config

- e.g. `Maybe<string>`` vs. `string | null``

Author: mattkhan

lib/anchor/config.rb

@@ -6,7 +6,8 @@ class Config
       :use_active_record_comment,
       :infer_nullable_relationships_as_optional,
       :empty_relationship_type,
-      :use_type_as_schema_name
+      :use_type_as_schema_name,
+      :maybe_as_union
 
     def initialize
       @ar_column_to_type = nil
@@ -16,6 +17,7 @@ def initialize
       @infer_nullable_relationships_as_optional = nil
       @empty_relationship_type = nil
       @use_type_as_schema_name = nil
+      @maybe_as_union = nil
     end
   end
 end

lib/anchor/type_script/file_structure.rb

@@ -85,6 +85,7 @@ def references_from_type(type)
     end
 
     def utils_to_import
+      return [] if Anchor.config.maybe_as_union
       maybe_type = has_maybe?(@object).presence && Anchor::Types::Reference.new("Maybe")
       [maybe_type].compact
     end

lib/anchor/type_script/serializer.rb

@@ -11,7 +11,7 @@ def type_string(type, depth = 1)
         when Anchor::Types::Null.singleton_class then "null"
         when Anchor::Types::Record, Anchor::Types::Record.singleton_class then "Record<string, #{type_string(type.try(:value_type) || Anchor::Types::Unknown)}>"
         when Anchor::Types::Union then type.types.map { |type| type_string(type, depth) }.join(" | ")
-        when Anchor::Types::Maybe then "Maybe<#{type_string(type.type, depth)}>"
+        when Anchor::Types::Maybe then Anchor.config.maybe_as_union ? type_string(Anchor::Types::Union.new([type.type, Anchor::Types::Null]), depth) : "Maybe<#{type_string(type.type, depth)}>"
         when Anchor::Types::Array then "Array<#{type_string(type.type, depth)}>"
         when Anchor::Types::Literal then serialize_literal(type.value)
         when Anchor::Types::Reference then type.name

spec/example/lib/tasks/anchor.rake

@@ -49,7 +49,7 @@ namespace :anchor do
       exclude_fields: nil,
       manually_editable: true,
     )
-    modified_files = Anchor::TypeScript::MultifileSaveService.call(generator:, folder_path:)
+    modified_files = Anchor::TypeScript::MultifileSaveService.call(generator:, folder_path:, force: true)
     puts modified_files.join(" ")
   end
 end