metro

Metro

🚇 The JavaScript bundler for React Native.

• 🚅 Fast: We aim for sub-second reload cycles, fast startup and quick bundling speeds.
• ⚖️ Scalable: Works with thousands of modules in a single application.
• ⚛️ Integrated: Supports every React Native project out of the box.

This project was previously part of the react-native repository. In this smaller repository it is easier for the team working on Metro to respond to both issues and pull requests. See react-native#13976 for the initial announcement.

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webpack

Webpack is a powerful module bundler for JavaScript applications, capable of transforming, bundling, or packaging just about any resource or asset. While Metro is optimized for React Native, Webpack is more flexible and can be used with a variety of frameworks and libraries. Webpack offers a rich plugin ecosystem and extensive configuration options, making it suitable for complex web application development.

parcel

Parcel is a web application bundler that offers out-of-the-box support for many file types without the need for configuration. It's designed to be fast, utilizing multicore processing to efficiently handle asset bundling. Compared to Metro, Parcel is more general-purpose, targeting web development rather than being optimized for React Native. Parcel's zero-configuration approach makes it appealing for projects where simplicity and speed are priorities.

rollup

Rollup is a module bundler for JavaScript that compiles small pieces of code into something larger and more complex, such as a library or application. It's known for its efficiency and is often used for bundling JavaScript libraries. Rollup focuses on producing smaller bundles by eliminating unused code. While Metro is tailored for React Native apps, Rollup is more suited for library development and projects where bundle size is a critical concern.