browsertime
Version:
Get performance metrics from your web page using Browsertime.
21 lines (20 loc) • 740 B
JavaScript
(function() {
const supported = PerformanceObserver.supportedEntryTypes;
if (!supported || supported.indexOf("first-input") === -1) {
return;
}
const observer = new PerformanceObserver(list => {});
observer.observe({ type: "first-input", buffered: true });
const entries = observer.takeRecords();
if (entries.length > 0) {
const entry = entries[entries.length - 1];
return {
duration: entry.duration,
name: entry.name,
processingEnd: Number(entry.processingEnd.toFixed(0)),
processingStart: Number(entry.processingStart.toFixed(0)),
startTime: Number(entry.startTime.toFixed(0)),
delay: Number((entry.processingStart - entry.startTime).toFixed(1))
};
} else return;
})();