React Native Codegen Tools

react-native-codegen is an essential internal tool within the React Native ecosystem, responsible for generating native code (Java, Objective-C++, C++) from JavaScript type definitions (Flow or TypeScript). These generated definitions form the basis of "TurboModules" and "Fabric Components" in React Native's New Architecture, enabling type-safe, performant communication between JavaScript and native platforms. It primarily operates at build time, invoked by the React Native CLI, to automatically create the necessary bridging code for native modules and UI components. The package versioning is tightly coupled with the React Native monorepo, with the latest stable versions generally mirroring the `react-native` package's minor version (e.g., `react-native-codegen@0.85.x` for `react-native@0.85.x`). Its release cadence follows the React Native release schedule, typically bi-monthly or quarterly for minor versions. It differentiates itself from older bridging mechanisms by providing a standardized, strongly-typed, and automatically generated interface, significantly reducing boilerplate and improving developer experience and performance for native module authors.