class Tapioca::Dsl::Compilers::Config

def decorate
  # The constant we are given is the specialized config options type
  option_class_name = constant.name
  return unless option_class_name
  # Grab the config constant name and the actual config constant
  config_constant_name = option_class_name
    .gsub(/#{CONFIG_OPTIONS_SUFFIX}$/, "")
  config_constant = Object.const_get(config_constant_name)
  # Look up method names from the keys of the config constant
  method_names = config_constant.keys
  return if method_names.empty?
  root.create_constant(config_constant_name, value: "T.let(T.unsafe(nil), #{option_class_name})")
  root.create_class(option_class_name, superclass_name: "::Config::Options") do |mod|
    # We need this to be generic only because `Config::Options` is an
    # enumerable and, thus, needs to redeclare the `Elem` type member.
    #
    # We declare it as a fixed member of `T.untyped` so that if anyone
    # enumerates the entries, we don't make any assumptions about their
    # types.
    mod.create_extend("T::Generic")
    mod.create_type_variable("Elem", type: "type_member", fixed: "T.untyped")
    method_names.each do |method_name|
      # Create getter method
      mod.create_method(
        method_name.to_s,
        return_type: "T.untyped",
      )
      # Create setter method
      mod.create_method(
        "#{method_name}=",
        parameters: [create_param("value", type: "T.untyped")],
        return_type: "T.untyped",
      )
    end
  end
end