mutation-summary library not working after updating mac to high sierra

[swagatata]

var observerNew = new MutationSummary({
    queries: [
      {
        element: 'input[type=password]'
      }
    ],
    callback: function(mutations) {
        console.log('inside the callback');
    },
  });

This is the code i have been using. it worked before but stopped working after i updated my OS to mac high sierra (version 10.13.1).

This is in chrome.