How to get gmail api when registering passport-google-oauth?

Question

gmail

There is authorization using assport-google-oauth

module.exports = function(passport) {

  passport.serializeUser(serializeUser);

  passport.deserializeUser(deserializeUser);
  
  passport.use(new GoogleStrategy({

    clientID        : configAuth.googleAuth.clientID,
    clientSecret    : configAuth.googleAuth.clientSecret,
    callbackURL     : configAuth.googleAuth.callbackURL,

  }, authCallback));
};


/**
 * Authentication callback
 * @return void
 */
function authCallback(token, refreshToken, profile, done) {
  process.nextTick(function() {
    console.log(profile) // тут данные пользователя. без данных gmail
    return done(null, profile);
  });
}

//router.js

app.get('/auth/google', passport.authenticate('google', { 
    scope : ['profile', 'email', 'https://www.googleapis.com/auth/gmail.readonly'] 
  }));

  app.get('/auth/google/callback', passport.authenticate('google', {
    failureRedirect : '/',
    successRedirect: '/home'
  }));

How can I get the API?
Thanks for the answer