Example of Sapper using Passport

server.js

import express from 'express';
import passport from 'passport';
import {Strategy} from 'passport-github';
import compression from 'compression';
import sapper from 'sapper';
import serve from 'serve-static';
import {routes} from './manifest/server.js';
import App from './App.html';
import _ from '../SECRETS';

passport.use(new Strategy({
  clientID: _.GITHUB_CLIENT_ID,
  clientSecret: _.GITHUB_CLIENT_SECRET,
  callbackURL: _.GITHUB_CALLBACK_URL,
}, (accessToken, refreshToken, profile, cb) => {
  console.log('success');
  return cb(null, profile);
}));

passport.serializeUser(function (user, cb) {
  cb(null, user);
});

passport.deserializeUser(function (obj, cb) {
  cb(null, obj);
});

express()

  .use(passport.initialize())

  .get('/auth/login', passport.authenticate('github'))

  .get('/auth/callback',
    passport.authenticate('github', {failureRedirect: '/login'}),
    (req, res) => {
      res.redirect('/');
    })

  .use(
    compression({threshold: 0}),
    serve('assets'),
    sapper({
      routes,
      App
    })
  )
  .listen(process.env.PORT);