
Rolldown
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| Fact | Rolldown | Rslib |
|---|---|---|
| License | Rolldown is free and open source; VoidZero states that it remains open source and MIT-licensed. | Rslib is free and open source software released under the MIT license. |
| Purpose | Rolldown is a Rust-based bundler for JavaScript with a Rollup-compatible API and esbuild feature parity. | Rslib is an Rsbuild-based tool for developing JavaScript libraries and UI component libraries. |
Rolldown suits JavaScript developers looking for a bundler with TypeScript and JSX transforms and a Rollup-compatible plugin API. Its guidance points most application developers toward using it through Vite and library authors toward tsdown.
Rslib is for developers building JavaScript packages or component libraries across supported UI frameworks. It can fit projects that need multiple output formats and integrations with testing, documentation, or component-development tools.