Currently, my front end is built using Angular9 and TypeScript.
I am looking to enhance my application with various performance metrics related to page load time recommended by the W3 working group W3 performance working group.
What steps should I take to integrate the Performance object into my TypeScript application so that I can actively monitor the different performance metrics described here?
Thank you, Pradip
The Performance APIs come directly from the browsers, so there is no need to import anything if you want to use them. Here's an example from MDN:
function print_nav_timing_data() {
// Use getEntriesByType() to only get the "navigation" events
var perfEntries = performance.getEntriesByType("navigation");
for (var i=0; i < perfEntries.length; i++) {
console.log("= Navigation entry[" + i + "]");
var p = perfEntries[i];
// DOM Properties
console.log("DOM content loaded = " + (p.domContentLoadedEventEnd - p.domContentLoadedEventStart));
console.log("DOM complete = " + p.domComplete);
console.log("DOM interactive = " + p.domInteractive);
// document load and unload time
console.log("document load = " + (p.loadEventEnd - p.loadEventStart));
console.log("document unload = " + (p.unloadEventEnd - p.unloadEventStart));
// other properties
console.log("type = " + p.type);
console.log("redirectCount = " + p.redirectCount);
}
}
If you're primarily interested in measuring these specific metrics, you can use the web-vitals project provided by Google here. The usage is as follows:
import {getFCP} from 'web-vitals';
// Measure and log the current FCP value,
// whenever it's ready to be reported.
getFCP(console.log);
Since the source code is available, you can also see how they utilize the APIs.
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