DefinitelyTyped/types/connect-mongodb-session/connect-mongodb-session-tests.ts

import * as express from 'express'
import session = require('express-session')
import connectMongo = require('connect-mongodb-session')
let MongoDBStore = connectMongo(session)

var app = express();
var store = new MongoDBStore({
  uri: 'mongodb://localhost:27017/connect_mongodb_session_test',
  collection: 'mySessions'
}, function(error) {
    // some connection error occur
});

store.on('connected', function() {
  store.client; // The underlying MongoClient object from the MongoDB driver
});

// Catch errors
store.on('error', function(error) {
});

app.use(require('express-session')({
  secret: 'This is a secret',
  cookie: {
    maxAge: 1000 * 60 * 60 * 24 * 7 // 1 week
  },
  store: store,
  // Boilerplate options, see:
  // * https://www.npmjs.com/package/express-session#resave
  // * https://www.npmjs.com/package/express-session#saveuninitialized
  resave: true,
  saveUninitialized: true
}));

app.get('/', function(req, res) {
  res.send('Hello ' + JSON.stringify(req.session));
});

const server = app.listen(3000);