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Adding new types of performance monitoring (#10421)
* add new types of performance monitoring * adding LCP * adding cls to perf relayer * add test for cls and lcp * nit fixes * re-organizing code * fixing tests for lcp * updating size limits in test
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,78 @@ | ||
function isTypeSupported(type) { | ||
if (self.PerformanceObserver && PerformanceObserver.supportedEntryTypes) { | ||
return PerformanceObserver.supportedEntryTypes.includes(type) | ||
} | ||
return false | ||
} | ||
|
||
export function observeLayoutShift(onPerfEntry) { | ||
if (isTypeSupported('layout-shift')) { | ||
let cumulativeScore = 0 | ||
const observer = new PerformanceObserver(list => { | ||
for (const entry of list.getEntries()) { | ||
// Only count layout shifts without recent user input. | ||
if (!entry.hadRecentInput) { | ||
cumulativeScore += entry.value | ||
} | ||
} | ||
}) | ||
observer.observe({ type: 'layout-shift', buffered: true }) | ||
|
||
document.addEventListener( | ||
'visibilitychange', | ||
function clsObserver() { | ||
if (document.visibilityState === 'hidden') { | ||
// Force any pending records to be dispatched. | ||
observer.takeRecords() | ||
observer.disconnect() | ||
removeEventListener('visibilitychange', clsObserver, true) | ||
onPerfEntry({ | ||
name: 'cumulative-layout-shift', | ||
value: cumulativeScore, | ||
}) | ||
} | ||
}, | ||
true | ||
) | ||
} | ||
} | ||
|
||
export function observeLargestContentfulPaint(onPerfEntry) { | ||
if (isTypeSupported('largest-contentful-paint')) { | ||
// Create a variable to hold the latest LCP value (since it can change). | ||
let lcp | ||
|
||
// Create the PerformanceObserver instance. | ||
const observer = new PerformanceObserver(entryList => { | ||
const entries = entryList.getEntries() | ||
const lastEntry = entries[entries.length - 1] | ||
lcp = lastEntry.renderTime || lastEntry.loadTime | ||
}) | ||
|
||
observer.observe({ type: 'largest-contentful-paint', buffered: true }) | ||
|
||
document.addEventListener( | ||
'visibilitychange', | ||
function lcpObserver() { | ||
if (lcp && document.visibilityState === 'hidden') { | ||
removeEventListener('visibilitychange', lcpObserver, true) | ||
onPerfEntry({ | ||
name: 'largest-contentful-paint', | ||
value: lcp, | ||
}) | ||
} | ||
}, | ||
true | ||
) | ||
} | ||
} | ||
|
||
export function observePaint(onPerfEntry) { | ||
const observer = new PerformanceObserver(list => { | ||
list.getEntries().forEach(onPerfEntry) | ||
}) | ||
observer.observe({ | ||
type: 'paint', | ||
buffered: true, | ||
}) | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,8 @@ | ||
export default () => { | ||
return <h1>Hello!</h1> | ||
return ( | ||
<div> | ||
<h1>Foo!</h1> | ||
<h2>bar!</h2> | ||
</div> | ||
) | ||
} |
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