PerformanceEntry: toJSON() メソッド

toJSON()

performance.mark("debug-marker", {
  detail: "debugging-marker-123",
});
const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    console.log(entry.toJSON());
  });
});
observer.observe({ entryTypes: ["mark"] });

{
  "name": "debug-marker",
  "entryType": "mark",
  "startTime": 158361,
  "duration": 0
}