Nightmarejs .click() on each element with delay between

index.js

var Nightmare = require('nightmare');
var nightmare = Nightmare({ show: true });

nightmare
  .goto('http://example.com/')
  .click('.buttonOpenModal')
  .wait('div.Buttons')
  .evaluate(function () {
    var interval = setInterval(function () {
      var btn = document.querySelectorAll('div.Buttons');
      if (undefined == btn || 0 == btn.length) {
        clearInterval(interval);
      }
      else {
        btn[0].click();
      }
    }, 5000);
  })
  .end()
  .then(function (result) {
    console.log(result)
  })
  .catch(function (error) {
    console.error('Search failed:', error);
  });