connect-mongo: touch does not update session.cookie.expires

When resave: false and rolling: true then the store will update the top-level expires in the session database on each request. express-session will also update the cookie and send it with every response.

The problem is that the stored document at the path session.cookie.expires does not get updated, so it is out-of-sync with both the top level expires as well as the expires in the cookie.

Since the touch() implementation already sends a call to the database to update the top-level expires should it not also update session.cookie.expires ?

This is the configuration of express-session:

  const store = new MongoStore({
    mongooseConnection: db,
    stringify: false,
  });

    session({
      secret: 'some_secret',
      resave: false,
      rolling: true,
      saveUninitialized: false,
      cookie: {
        maxAge: 60000,
        secure: true,
        httpOnly: true,
      },
      store,
    })

The actual document saved to the store looks something like this:

{
  "_id": "f2yQHE_BPi6UKV4pMuM7xluGPwQIhxIU",
  "expires": {
    "$date": "2020-02-03T15:23:54.646Z"
  },
  "session": {
    "cookie": {
      "originalMaxAge": 3599997,
      "expires": {
        "$date": "2020-02-03T15:04:06.890Z"
      },
      "secure": false,
      "httpOnly": true,
      "domain": null,
      "path": "/",
      "sameSite": null
    },
    "passport": {
      "user": "someUser"
    }
  }
}