user undefined after login

I am trying to authenticate user ,when i try to login user after successful verification using `req.logIn` but it doesn't worked

router.post('/login', function(req, res, next) {
passport.authenticate('login',function (cb,data) {
//user verfication success
if(data){
req.logIn({user:"shamon"},function(err,result){
console.log("result",result,err)
res.send('login success');
});
}
})(req,res,next);
});

this `console.log("result",result,err)` gives me `undefined,undefined`

when i log `req.user` after logged i got undefined error

Start at the router.post('/login') entry point and read the req.logIn API and its callback contract. Reproduce the login flow, inspect why req.user and the callback values are undefined, and consider the issue done when the route reliably establishes the authenticated user or documents the missing context needed to diagnose it.

Written by the indexing model from the issue text.