Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52925
# Changelog:
[Internal] -
This adds an extra "ranking" report when running Fantom benchmark vs different React Feature flag configurations.
It can be very useful when implementing some particular optimization, to streamline the before/after comparison wit this optimization enabled/disabled.
Reviewed By: andrewdacenko
Differential Revision: D79269601
fbshipit-source-id: f29e761e313d6857e5b3ac65faf2a387a84be9df
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52827
Changelog: [internal]
This adds **support for creating Hermes/JS sampling profiler traces in Fantom**, which is especially useful when running benchmarks.
Usage:
```
FANTOM_PROFILE_JS=1 yarn fantom Animated-benchmark
```
Output:
{F1980642216}
After this, the trace is fully symbolicated.
Can be opened directly in Google Chrome:
{F1980642229}
Or in the built-in viewer in VSCode:
{F1980642242} {F1980642240} {F1980642241}
When collapsing frames in the Flame Chart viewer in VSCode, we can quickly identify opportunities for optimizations.
This also supports multi-config environments. In that case, trace file names are created using a short representation of the configuration.
User guide for benchmarks in Fantom, including how to use this, will be done in a future diff.
NOTE: This still doesn't work in OSS because we don't support optimized mode there. In dev mode, there's a segmentation fault coming from this line: `hermesRuntime->sampledTraceToStreamInDevToolsFormat(fileStream)`
Reviewed By: sammy-SC
Differential Revision: D78905646
fbshipit-source-id: 382ddd5034db601309bd118cedde2fe0d57fde98
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52765
Changelog: [internal]
Reported locations for errors in Fantom is wrong, because it seems it's not ignoring "infra" frames.
This was caused by the `stack` property in `ErrorWithCustomBlame` being set on the error objects and shadowing the getter that removes the necessary frames. This fixes that by forcing that property to be deleted.
Reviewed By: christophpurrer
Differential Revision: D78747119
fbshipit-source-id: 81d6ce74041382d7582e2066409e839d28d91052
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52601
Changelog: [internal]
Fixes a bug in Fantom when throwing a value that's not an instance of `Error` in a test.
Reviewed By: javache
Differential Revision: D78332756
fbshipit-source-id: 350479dcb7bcea399070c6851aca76a1d1cc2629
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52474
1. Enables the feature flags for fragment refs on fbsource
2. Adds a test with Fantom for usage of `FragmentInstance#observeUsing` and `FragmentInstance#unobserveUsing`.
3. Exposes the `ReactFragmentInstance` type with the common methods that are used on native. We can override the DOM only methods in www libdefs.
Changelog: [Internal]
Reviewed By: rubennorte
Differential Revision: D74326262
fbshipit-source-id: e35ee45b23179ad3ba5527763567c9b04c127eff
Ruslan Shestopalyuk
Rubén Norte
Jack Pope
Tim Yung