public getPerfTiming()

in src/performance/perf.ts [20:63]
39 lines of code
8 McCabe index (conditional complexity)

  public getPerfTiming(): IPerfDetail {
    try {
      let { timing } = window.performance as PerformanceNavigationTiming | any; // PerformanceTiming
      if (typeof window.PerformanceNavigationTiming === 'function') {
        const nt2Timing = getNavigationEntry();

        if (nt2Timing) {
          timing = nt2Timing;
        }
      }
      let redirectTime = 0;

      if (timing.navigationStart !== undefined) {
        redirectTime = Math.floor(timing.fetchStart - timing.navigationStart);
      } else if (timing.redirectEnd !== undefined) {
        redirectTime = Math.floor(timing.redirectEnd - timing.redirectStart);
      } else {
        redirectTime = 0;
      }

      return {
        redirectTime,
        dnsTime: Math.floor(timing.domainLookupEnd - timing.domainLookupStart),
        ttfbTime: Math.floor(timing.responseStart - timing.requestStart), // Time to First Byte
        tcpTime: Math.floor(timing.connectEnd - timing.connectStart),
        transTime: Math.floor(timing.responseEnd - timing.responseStart),
        domAnalysisTime: Math.floor(timing.domInteractive - timing.responseEnd),
        fptTime: Math.floor(timing.responseEnd - timing.fetchStart), // First Paint Time or Blank Screen Time
        domReadyTime: Math.floor(timing.domContentLoadedEventEnd - timing.fetchStart),
        loadPageTime: Math.floor(timing.loadEventStart - timing.fetchStart), // Page full load time
        // Synchronous load resources in the page
        resTime: Math.floor(timing.loadEventStart - timing.domContentLoadedEventEnd),
        // Only valid for HTTPS
        sslTime:
          location.protocol === 'https:' && timing.secureConnectionStart > 0
            ? Math.floor(timing.connectEnd - timing.secureConnectionStart)
            : undefined,
        ttlTime: Math.floor(timing.domInteractive - timing.fetchStart), // time to interact
        firstPackTime: Math.floor(timing.responseStart - timing.domainLookupStart), // first pack time
      };
    } catch (e) {
      throw e;
    }
  }