Metro Bundler

Metro is the JavaScript bundler for React Native, currently at v0.84.3. It is maintained by Meta and releases follow a regular cadence aligned with React Native releases. Metro focuses on sub-second reload cycles, fast startup, and handling thousands of modules. It is deeply integrated with React Native's development workflow, providing Fast Refresh, HMR, and a symmetric asset system. Compared to alternatives like Webpack, Metro is purpose-built for React Native, offering out-of-the-box support for React Native's module system, asset loading, and platform-specific code. It is configurable via metro.config.js and supports both CommonJS and ES modules.