Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36152
[Changelog][Internal]
By [the W3C standard](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver/observe), `PerformanceObserver.observer` can optionally take a `durationThreshold` option, so that only entries with duration larger than the threshold are reported.
This diff adds support for this on the RN side, as well as unit tests for this feature on the JS side.
NOTE: The standard suggests that default value for this is 104s. I left it at 0 for now, as for the RN use cases t may be to too high (needs discussion).
Reviewed By: rubennorte
Differential Revision: D43154319
fbshipit-source-id: 0f9d435506f48d8e8521e408211347e8391d22fc
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36181
[Changelog][Internal]
Implements EventCounts API (`Performance.eventCounts`) for Web Performance, according to the W3C standard, see the specs here: https://www.w3.org/TR/event-timing/#eventcounts
The rationale for why we need it is to support some advanced metrics computations, such as a ratio of "slow events" to total event count, per event type.
Reviewed By: rubennorte
Differential Revision: D43285073
fbshipit-source-id: 2c53d04d9a57c1301e37f2a5879072c8d33efbbf
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36116
[Changelog][Internal]
Add a minimal/reference JavaScript implementation for NativePerformanceObserver - the purpose is both unit testing (JS and native sides separately) and potentially shimming the part of functionality that is not dependent on native side.
This is both a setup for adding general unit tests for the Performance* APIs, but also to be able to do non-trivial changes on JS side for WebPerformance (such as in (D43154319).
Reviewed By: rubennorte
Differential Revision: D43167392
fbshipit-source-id: 213d9534d810dece1dd464f910e92e08dbf39508
Ruslan Shestopalyuk