err is TypeError: this._expirationInterval.unref is not a function

[Nishant Dani]

I am testing using jest and getting an exception when
This seems similar to #86 . The stack at this time is:

      at SequelizeStore.startExpiringSessions (node_modules/connect-session-sequelize/lib/connect-session-sequelize.js:163:32)
      at new SequelizeStore (node_modules/connect-session-sequelize/lib/connect-session-sequelize.js:41:10)

I added a console.log at the statement and it appears

  this._expirationInterval = setInterval(this.clearExpiredSessions.bind(this), this.options.checkExpirationInterval)
  console.log(`this._expirationInterval is ${this._expirationInterval}, ${typeof this._expirationInterval}`)

this._expirationInterval is 4, number

So it appears that setInterval returns an opaque number instead of a timeout object and that is why the unref call is failing.

[Nishant Dani]

The issue was that jest was using jsdom instead of node and that was leading to the incorrect setInterval being resolved. Fixed this by setting jest configuration to node.