NightmareJS `clickNth` custom action

clickNth.js

Nightmare.action("clickNth", function (selector, n, done) {
  debug(".clickNth() on " + selector + ":" + n)
  this.evaluate_now(function (selector, n) {
    document.activeElement.blur()
    var element = document.querySelectorAll(selector)[n]
    if (!element) {
      throw new Error('Unable to find element by selector: ' + selector)
    }
    var event = document.createEvent('MouseEvent')
    event.initEvent('click', true, true)
    element.dispatchEvent(event)
  }, done, selector, n)
})