[BitBucket DateDisplay] Display non-fuzzy dates for BitBucket #UserScript

BitBucket DateDisplay.user.js

// ==UserScript==
// @name         BitBucket DateDisplay
// @version      0.1
// @description  Display non-fuzzy dates for BitBucket
// @author       rjf89
// @match        http*://bitbucket.org/*/pull-requests/*
// @grant        none
// ==/UserScript==

const setNonFuzzy           = (time)         => time.textContent = `${new Date(time.getAttribute('datetime')).toISOString().slice(0, 16).replace('T', ' ')} (${time.textContent})`;
const isTimeNode            = (node)         => node.nodeName === 'TIME';
const getTimeNodes          = (node)         => node && node.nodeType === 1 ? [...node.getElementsByTagName('time')] : [];
const hasTimeNodes          = (node)         => getTimeNodes(node).length > 0;
const isNotUpdated          = (target)       => !target.textContent.includes(' (');
const timeChildrenAdded     = (type, nodes)  => type === 'childList'     && nodes.length >= 1  && [...nodes].some(hasTimeNodes);
const timeChanged           = (type, target) => (type === 'characterData' || type === 'attributes') && isTimeNode(target) && isNotUpdated(target);

function updateDates(mutations) {
  [...mutations]
    .filter(({type, target, addedNodes}) => timeChildrenAdded(type, addedNodes) || timeChanged(type, target))
    .forEach(function({type, target, addedNodes}) {
      if (type === 'childList')  { [].concat(...[...addedNodes].map(getTimeNodes)).forEach(setNonFuzzy); }
      else                       { setNonFuzzy(target); }
  });
}

(function() {
  'use strict';
  [...document.getElementsByTagName('time')].forEach(setNonFuzzy);
  new MutationObserver(updateDates).observe(document.documentElement, { characterData: true, childList: true, subtree: true, attributes: true, attributeFilter: ['datetime'] });
})();