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doc: add PerformanceObserver buffered document #39514

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doc: add PerformanceObserver buffered document #39514

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8 changes: 8 additions & 0 deletions doc/api/perf_hooks.md
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Expand Up @@ -585,6 +585,10 @@ Disconnects the `PerformanceObserver` instance from all notifications.
<!-- YAML
added: v8.5.0
changes:
- version: REPLACEME
pr-url: https://github.com/nodejs/node/pull/39297

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description: Updated to conform to Performance Timeline Level 2. The
buffered option has been added back.
- version: v16.0.0
pr-url: https://github.com/nodejs/node/pull/37136
description: Updated to conform to User Timing Level 3. The
Expand All @@ -597,6 +601,10 @@ changes:
* `entryTypes` {string[]} An array of strings identifying the types of
{PerformanceEntry} instances the observer is interested in. If not
provided an error will be thrown.
* `buffered` {boolean} If true, the observer callback is called with a
list global `PerformanceEntry` buffered entries. If false, only
`PerformanceEntry`s created after the time point are sent to the
observer callback. **Default:** `false`.

Subscribes the {PerformanceObserver} instance to notifications of new
{PerformanceEntry} instances identified either by `options.entryTypes`
Expand Down