// auth setup

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

passport.deserializeUser((id: number, done: any) => {
  Users.findById(id, (err: any, user) => {
    if (err) {
      console.log(err);
      done(null);
    }
    done(null, user);
  });
});

passport.use(new (LocalStrategy as any)(
  (username: string, password: string, done: any) => {
    Users.findOne({ email: username }, (err: any, user: any) => {
      if (err) {
        return done(err);
      }

      if (!user) {
        return done(null, false, { message: "No user exists with those credentials." });
      }

      if (!comparePasswords(password, user.salt, user.hashedPassword)) {
        return done(null, false, { message: "Bad password."});
      }

      return done(null, user);
  });
}));
...

// route use

...
users.post("/login", passport.authenticate("local", { failureRedirect: "/login" }), (request: any, response: any) => {
  return response.json('test');
});
...