PassportJS with Google OAuth strategy not working as expected

[Mateo]

Hello everybody!
First time creating an issue on GitHub, sorry if I'm not doing it the right way.

I'm having trouble integrating PassportJS strategies to my project while using typescript-rest.
Using PassportJS the default way (= app.get('/auth/google', passport.authenticate('google'))) redirects me to Google's auth page as expected.

Now when I try to do the same thing with typescript-rest, nothing happens neither in the console or in the page itself.
Here's what I tried with typescript-rest.

Project entry file : index.ts

import express from 'express';
import compression from 'compression';
import helmet from 'helmet';
import { Server } from 'typescript-rest';
import passport from 'passport';
import { API_PORT, API_URL, GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET } from './constants';
import appControllers from './controllers';

const GoogleStrategy = require('passport-google-oauth20');

// Express
const app: express.Application = express();

// Passport setup
passport.serializeUser((user, done) => {
  done(null, user);
});

passport.deserializeUser((user: any, done) => {
  done(null, user);
});

// Passport strategies
passport.use(
  new GoogleStrategy(
    {
      clientID: GOOGLE_CLIENT_ID,
      clientSecret: GOOGLE_CLIENT_SECRET,
      callbackURL: `/auth/google/redirect`,
    },
    (/* accessToken: any, refreshToken: any, profile: any, cb: any */) => {
      console.log('test');
      // User.findOrCreate({ googleId: profile.id }, (err, user) => cb(err, user));
    },
  ),
);

app.use(passport.initialize());

// Middlewares
// CORS
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Methods', 'DELETE, PUT, GET, POST');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

app.use(compression());
app.use(helmet());
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

// typescript-rest
Server.buildServices(app, ...appControllers);

app.listen(API_PORT, () => {
  console.log(`⚡️ [server]: Server is running at ${API_URL}:${API_PORT}`);
});

Controllers list : controllers.ts

import AuthController from './auth/auth.controller';

const appControllers = [AuthController];

export default appControllers;

Auth controller : auth.controller.ts

import AuthService from '@services/auth/auth.service';
import { Path, GET, Accept } from 'typescript-rest';

@Accept('application/json')
@Path('auth')
class AuthController {
  private authService: AuthService;

  getName(): string {
    return 'AuthController';
  }

  constructor() {
    this.authService = new AuthService();
  }

  @Path('google')
  @GET
  googleAuth() {
    return this.authService.google();
  }
}

export default AuthController;

Auth service : auth.service.ts

import passport from 'passport';

class AuthService {
  google() {
    return passport.authenticate('google', {
      scope: ['profile'],
    });
  }
}

export default AuthService;

I simply don't get why app.get() works while everything else I tried fails.
I'm probably doing something wrong, but I can't find out what.