passport local strategy's not getting called

I'm currently making app with vue & express.

I adopted passport as authentication library and I've used it several times.

so I know that when I make login request, passport middleware authenticates user by 'xx strategy'.

The problem is register request works well but login isn't.

I constantly get 'false' for response.data.

I can't even guess where the false comes from.

There is no return statements that returns false.

follow is my code.

passport.deserializeUser((authId, done) => {
  let hasUser
  let users = User.findOneByAuthId(authId)
  .then(results => (hasUser = results.length))

  if (hasUser) {
    console.log('deserialize!')
    done(null, users[0])
  } else {
    console.log('no user')
    done(null, { message: 'no user' })
  }
})

passport.use(new LocalStrategy(
  (username, password, done) => {
    let hasUser
    let users = User.findOneByEmail(username)
    .then(results => (hasUser = results.length))

    if (hasUser) {
      let user = users[0]
      let { hash } = user

      if (User.checkPassword(password, hash)) {
        done(null, { message: 'success' })
      } else {
        done(null, { message: 'wrong password' })
      }
    } else {
      done(null, { message: 'wrong email' })
    }
  }
))

router.post('/register', (req, res) => {
  if (!fun.emailChecker(req.body.username)) {
    return res.status(403).json({
      message: 'Invalid Email'
    })
  }

  if (!fun.passwordChecker(req.body.password)) {
    return res.status(403).json({
      message: 'Invalid Password'
    })
  }

  let hasUser
  User.findOneByEmail(req.body.username)
  .then(results => (hasUser = results.length))

  if (hasUser) {
    return res.status(409).json({
      message: 'Email Exist'
    })
  } else {
    let user = {
      authId: 'local: ' + req.body.username,
      email: req.body.username,
      hash: User.hashPassword(req.body.password),
      displayName: req.body.displayName
    }

    User.create(user)
    .then(results => {
      if (!results) {
        throw new Error('user creation error')
      } else {
        req.login(user, err => {
          if (!err) {
            req.session.save(() => {
              return res.json({ success: true })
            })
          }
        })
      }
    })
  }
})

router.post('/login', (req, res) => {
  passport.authenticate('local', (err, result) => {
    if (!err) {
      return res.json(result)
    }
  })(req, res)
})

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