I don't know about the halt() function but basically I did another workaround.

Creating a nightmare window without calling end()
Then add a button to call only the end()

Maybe you wanted a pause button too. But I suppose this one was the best thing I could come of with.
Here is something else to help you understand my perspective.

First I do this to run nightmare inside electron,
#856 (comment)

Then I use this index.html file.

<button id="start">Start</button>
<button id="stop">Stop</button>
<b id="status">idle</b>
<b id="results"></b>

<script>
// We allow nightmare to wander in the global scope by defining it here, 
// otherwise we would not be able to call it multiple times
var Nightmare = require('nightmare');
var nightmare;
var args = { show: true, alwaysOnTop: false };


document.getElementById("start").addEventListener("click", function(){
  document.getElementById("status").innerHTML = "Searching for the gem";

  // Here we start the Nightmare Instance
  nightmare = Nightmare(args);
  nightmare
    .goto('http://yahoo.com')
    .type('form[action*="/search"] [name=p]', 'github nightmare')
    .click('form[action*="/search"] [type=submit]')
    .wait('#main')
    .evaluate(function () {
      return document.querySelector('#main .searchCenterMiddle li a').href
    })
    .then(function (result) {
      document.getElementById("results").innerHTML = result;
    })
    .catch(function (error) {
      document.getElementById("results"). innerHtml = "Search failed: " + error;
    });

})
document.getElementById("stop").addEventListener("click", function(){
  nightmare
  .end()
  .then(function (result) {
      document.getElementById("status").innerHTML = "Leaving Nightmare Speechless";
    })
})
</script>

And the result is this,

It might look really stupid, but this works for me I guess.

how to end nightmare #835

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