Rollup vs Rslib
Rollup
rollupjs.orgRslib
lib.rsbuild.devSide by side
| Figure | Rollup | Rslib |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Plans published | 0 | 1 |
| Spec score · JavaScript Build Tools | 7.3 (#20) | 8.6 (#2) |
| License | Rollup is released under the MIT License. | Rslib is free and open source software released under the MIT license. |
| Output formats | It supports output formats including ES modules, CommonJS, UMD, and SystemJS. | Rslib supports ESM, CJS, UMD, Module Federation, and IIFE output formats. |
| Purpose | Rollup is a JavaScript module bundler that compiles smaller code modules into libraries or applications. | Rslib is an Rsbuild-based tool for developing JavaScript libraries and UI component libraries. |
Plans
In their own words
Rslib
Rslib is a free, open-source tool for developing JavaScript packages and UI component libraries. Based on Rsbuild and powered by Rspack, it integrates Rust-based tools including SWC and Lightning CSS. It supports bundle and bundleless build modes and outputs ESM, CJS, UMD, Module Federation, and IIFE formats. Framework integrations support component libraries for React, Vue, Svelte, and Solid. Rslib can generate TypeScript declaration files, including isolated declarations, though declaration generation is not enabled by default. Plugin support includes Rsbuild, Rspack, and webpack plugins. Its development integrations include Rstest for testing, Storybook for component development, Rspress for documentation and component previews, and Rsdoctor for build analysis. The quick-start guide lists Node.js, Deno, and Bun as runtime options, while Rslib v1 requires Node.js 20.19+ or 22.12+. It is available for API, Linux, macOS, web, and Windows, and is released under the MIT license.