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Rubén Norte
705c675d51
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/42430 This PR creates a new internal feature flags system for React Native. This is only meant to be used internally within the framework, but we might expose it externally in some form in the future to allow customizing specific feature flags in frameworks and applications. Features: * 2 types of flags: * Common: can be overridden from native and are accessible from all layers of the stack (Objective-C/Swift, Java/Kotlin, C++ and JavaScript). * JS-only: flags that can only be defined and accessed from JS (to allow things like hot reloading without a native build). * 1 source of truth for each flag. * Feature flags are application/process scoped (using C++ singletons). See the `README.md` file in this PR for additional information. This also adds modifies `run-ci-javascript-tests` to run a new check to make sure that the generate files are in sync with the JSON file that contains the definitions. Changelog: [internal] Reviewed By: huntie Differential Revision: D52806730 fbshipit-source-id: 0ba95803f61ec2f05266ee535921321bf6d3dc6a