clear cache in Nightmare.js (Electron)

I'm using nightmare js to log into a site that sets a token in local storage. However, any future tests I run the user is already logged in. I'm guessing the local storage wasn't cleared. Is there any way to do this? My code in test.js

require('mocha-generators').install();var Nightmare = require('nightmare');var expect = require('chai').expect;describe('test login', function() {  var nightmare = Nightmare({show: true})  after(function*() {    yield nightmare.end();  })  it('should login given right credentials', function*() {    this.timeout(50000);    console.log("running test");    var link = yield nightmare      .goto('http://127.0.0.1:3000/login')      .wait(1000)      .type('.email-field', 'username@email.com')      .type('.password-field', 'password')      .click('.login button')      .wait(1000)  });})

I run the test using: mocha

the test runs fine and closes. However when I run again the user starts off as logged in. Is there anyway to clear the cache or local storage in nightmarejs?

Electron has a way to clear session info via session.clearCache (http://electron.atom.io/docs/v0.32.0/api/session/) but I don't know how to access the session object from nightmare.