mutation.js

const [updateUserSetting] = useMutation(
    UPDATE_APP_BAR_COLOR_SETTING_MUTATION,
    {
      variables: { setting },
      update: cache => {
        let { appBarColorSetting } = cache.readQuery({
          query: APP_BAR_COLOR_SETTING_QUERY
        });
        appBarColorSetting.setting = setting;
        cache.writeQuery({
          query: APP_BAR_COLOR_SETTING_QUERY,
          data: { appBarColorSetting }
        });
      }
    }
  );