passport-config.js

const LocalStrategy = require('passport-local').Strategy
const bcrypt = require('bcrypt')

 function initialize(passport, getUserByEmail, getUserById){
    const authenticateUser = async (email, password, done) => {
        const user = getUserByEmail(email)
        if(user == null){
            return done(null, false, {message: 'No user with that email'})
        }

        try{                //name pass         user input
            if(await bcrypt.compare(password, user.password))
            {
                //password is the same
                return done(null, user)
            }
            else
            {
                return done(null, false, {message: 'Password incorrect'})
            }
        }catch(e){
            return done(e)
        }
    }
    passport.use(new LocalStrategy({ usernameField: 'email'}, authenticateUser))
    passport.serializeUser((user, done) => done(null, user.id))
    passport.deserializeUser((id, done) => {
        return done(null, getUserById(id))
    })
}

module.exports = initialize