How to use the @feathersjs/express/rest.formatter function in @feathersjs/express

}, pick(authSettings, ...INCLUDE_KEYS), providerSettings, omit(options, ...EXCLUDE_KEYS));

    // Set callback defaults based on provided path
    oauth1Settings.callbackPath = oauth1Settings.callbackPath || `${oauth1Settings.path}/callback`;
    oauth1Settings.callbackURL = oauth1Settings.callbackURL || makeUrl(oauth1Settings.callbackPath, app);

    if (!oauth1Settings.consumerKey) {
      throw new Error(`You must provide a 'consumerKey' in your authentication configuration or pass one explicitly`);
    }

    if (!oauth1Settings.consumerSecret) {
      throw new Error(`You must provide a 'consumerSecret' in your authentication configuration or pass one explicitly`);
    }

    const Verifier = options.Verifier || DefaultVerifier;
    const formatter = options.formatter || rest.formatter;
    const handler = options.handler || defaultHandler(oauth1Settings);
    const errorHandler = defaultErrorHandler(oauth1Settings);

    // register OAuth middleware
    debug(`Registering '${name}' Express OAuth middleware`);
    app.get(oauth1Settings.path, auth.express.authenticate(name, oauth1Settings));
    app.get(
      oauth1Settings.callbackPath,
      // NOTE (EK): We register failure redirect here so that we can
      // retain the natural express middleware redirect ability like
      // you would have with vanilla passport.
      auth.express.authenticate(name, oauth1Settings),
      handler,
      errorHandler,
      auth.express.emitEvents(authSettings, app),
      auth.express.setCookie(authSettings),