passport.js

import passport from 'passport';
import {Strategy as TwitterStrategy} from 'passport-twitter';

export function setup(User, config) {
    passport.use(new TwitterStrategy({
        consumerKey: config.twitter.clientID,
        consumerSecret: config.twitter.clientSecret,
        callbackURL: config.twitter.callbackURL
    },
    function(token, tokenSecret, profile, done) {
        profile._json.id = `${profile._json.id}`;
        profile.id = `${profile.id}`;

        <% if(filters.mongooseModels) { %>User.findOne({'twitter.id': profile.id}).exec()<% }
           if(filters.sequelizeModels) { %>User.find({where:{'twitter.id': profile.id}})<% } %>
            .then(user => {
                if(user) {
                    return done(null, user);
                }

                <% if(filters.mongooseModels) { %>user = new User({<% }
                   if(filters.sequelizeModels) { %>user = User.build({<% } %>
                    name: profile.displayName,
                    username: profile.username,
                    role: 'user',
                    provider: 'twitter',
                    twitter: profile._json
                });
                <% if(filters.mongooseModels) { %>user.save()<% }
                   if(filters.sequelizeModels) { %>user.save()<% } %>
                    .then(savedUser => done(null, savedUser))
                    .catch(err => done(err));
            })
            .catch(err => done(err));
    }));
}