code: function LicencedError(mangaSite, mangaName) {
      var instance = new Error(mangaSite + " has '" + mangaName + "' licenced.");
      instance.mangaSite = mangaSite;
      instance.mangaName = mangaName;
      Object.setPrototypeOf(instance, Object.getPrototypeOf(this));
      if (Error.captureStackTrace) {
          Error.captureStackTrace(instance, LicencedError);
      }
      return instance;
  }
docs: /* LicencedError