Event Processing Time

const events = new Map([
  ["connectTime", { start: "connectStart", end: "connectEnd" }],
  ["domainLookupTime", { start: "domainLookupStart", end: "domainLookupEnd" }],
  [
    "DOMContentLoaded",
    { start: "domContentLoadedEventStart", end: "domContentLoadedEventEnd" }
  ],
 
  ["onload", { start: "loadEventStart", end: "loadEventEnd" }]
]);
 
const observer = new PerformanceObserver((list) => {
  const displayTimes = [];
  list.getEntries().forEach((entry) => {
    console.log(entry);
    for (const [key, value] of events) {
      const endValue = entry[value.end];
      const startValue = entry[value.start];
 
      const eventTime = endValue - startValue;
 
      displayTimes.push({
        url: entry.name,
        event: key,
        processingTime: `${eventTime.toFixed(2)} ms`
      });
    }
  });
 
  console.table(displayTimes);
});
 
observer.observe({ type: "navigation", buffered: true });