Passport authenticate callback not being called - node.js

Question

I had a problem with Passport's authenticate method. The callback supplied to the method was not called.
The code was as follows:
import { Router, Request, Response, NextFunction } from 'express';
import jwt from 'jsonwebtoken';
import passport from 'passport';
// ... some stuff
router.post('/login',
(req: Request, res: Response, next: NextFunction) => {
passport.authenticate('local', { session: false }, (err, user, info) => {
// not reaching this part
if (err) {
return next(err);
}
if (err || !user) {
return res.status(400).json({
message: info ? info.message : 'Login failed',
user,
});
}
req.login(user, { session: false }, loginErr => {
if (loginErr) {
res.send(loginErr);
}
const token = jwt.sign(user, secrets.secret);
return res.json({ user, token });
});
return res.status(500).send('Shouldn\'t come here');
});
},
(err: any, req: Request, res: Response, next: NextFunction) => {
return res.status(err.status || 500).send(err.message)
});

Answer 1

I missed a crucial part of the example I based my code on. I had to use passport.authenticate as middleware. So, I used passport.authenticate to generate a function and then passed req, res and next to it like so:
router.post('/login',
(req: Request, res: Response, next: NextFunction) => {
// vvv THIS VARIABLE
const middleware = passport.authenticate('local', { session: false }, (err, user, info) => {
if (err) {
return next(err);
}
if (err || !user) {
return res.status(400).json({
message: info ? info.message : 'Login failed',
user,
});
}
req.login(user, { session: false }, loginErr => {
if (loginErr) {
res.send(loginErr);
}
const token = jwt.sign(user, secrets.secret);
return res.json({ user, token });
});
return res.status(500).send('Shouldn\'t come here');
});
// vvv AND THIS FUNCTION CALL
middleware(req, res, next);
},
(err: any, req: Request, res: Response, next: NextFunction) => {
return res.status(err.status || 500).send(err.message)
});
And everything worked.