coach-core/lib/dom/timings/navigationTimings.js

Core package for the Coach.

(function () {
  'use strict';

  const t = window.performance.timing;

  const metrics = {
    navigationStart: 0,
    unloadEventStart:
      t.unloadEventStart > 0
        ? t.unloadEventStart - t.navigationStart
        : undefined,
    unloadEventEnd:
      t.unloadEventEnd > 0 ? t.unloadEventEnd - t.navigationStart : undefined,
    redirectStart:
      t.redirectStart > 0 ? t.redirectStart - t.navigationStart : undefined,
    redirectEnd:
      t.redirectEnd > 0 ? t.redirectEnd - t.navigationStart : undefined,
    fetchStart: t.fetchStart - t.navigationStart,
    domainLookupStart: t.domainLookupStart - t.navigationStart,
    domainLookupEnd: t.domainLookupEnd - t.navigationStart,
    connectStart: t.connectStart - t.navigationStart,
    connectEnd: t.connectEnd - t.navigationStart,
    secureConnectionStart: t.secureConnectionStart
      ? t.secureConnectionStart - t.navigationStart
      : undefined,
    requestStart: t.requestStart - t.navigationStart,
    responseStart: t.responseStart - t.navigationStart,
    responseEnd: t.responseEnd - t.navigationStart,
    domLoading: t.domLoading - t.navigationStart,
    domInteractive: t.domInteractive - t.navigationStart,
    domContentLoadedEventStart:
      t.domContentLoadedEventStart - t.navigationStart,
    domContentLoadedEventEnd: t.domContentLoadedEventEnd - t.navigationStart,
    domComplete: t.domComplete - t.navigationStart,
    loadEventStart: t.loadEventStart - t.navigationStart,
    loadEventEnd: t.loadEventEnd - t.navigationStart
  };

  // Selenium converts undefined to null so lets just remove
  // the undefined keys
  Object.keys(metrics).forEach(function (key) {
    if (metrics[key] === undefined) {
      delete metrics[key];
    }
  });

  return metrics;
})();