createObserver()#

Creates a PerformanceObserver object that will be used to receive performance events generated by Lynx engine.

#Syntax

createObserver(callback: PerformanceCallback): PerformanceObserver;

#Parameters

#callback

A callback function that handles performance events, defined as type PerformanceCallback = (entry: PerformanceEntry) => void. The entry is a subclass of PerformanceEntry.

This callback is triggered when the PerformanceObserver receives a performance event.

#Return Value

A PerformanceObserver object.

#Examples

The following example creates a PerformanceObserver watching for metric.fcp and pipeline entries.

performance-apisrc/simple-observe/index.tsx

Preview

#Compatibility