Add per-platform redBoxV2 feature flags#56508
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Summary:
Adds a mechanism to override React Native feature flag default values via a Buck command line argument, without modifying source files.
A `genrule` in the featureflags BUCK target always interposes on `ReactNativeFeatureFlagsDefaults.h` before compilation. When `react_native.feature_flag_defaults` is set to a JSON object via `--config`, a Python script rewrites the return values in the matching method bodies. When unset, the header passes through unmodified.
The Python script matches each override against the full method signature shape (`<returnType> <flagName>() override { ... return <value>; }`) with lenient whitespace, and fails the build if any requested flag name is not found in the header.
Usage:
```
buck2 build --config 'react_native.feature_flag_defaults={"enableViewCulling":true}' //target
buck2 build --config 'react_native.feature_flag_defaults={"enableViewCulling":true,"preparedTextCacheSize":500}' //target
```
This modifies defaults only — app-level providers still take priority.
Changelog: [Internal]
Reviewed By: robhogan
Differential Revision: D101484355
Summary: Add `redBoxV2IOS` and `redBoxV2Android` common feature flags (default false), gating RedBox 2.0 independently on each platform. Changelog: [Internal] Reviewed By: cipolleschi Differential Revision: D98115369
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Summary:
Add
redBoxV2IOSandredBoxV2Androidcommon feature flags (default false), gating RedBox 2.0 independently on each platform.Changelog: [Internal]
Reviewed By: cipolleschi
Differential Revision: D98115369