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Rolldown, the Rust-based high-performance JavaScript bundler, has reached 1.0 stable. It is now the default bundler powering Vite 8 and is production-ready for standalone use. Key highlights include 10x-30x speed improvement over Rollup (on par with esbuild), full Rollup plugin API compatibility, advanced dead code elimination, granular code splitting, and a stable semver-locked public API. Real-world adopters like Ramp, Mercedes-Benz.io, and Beehiiv report build time reductions of 38-64%. Upgrading from the latest RC requires no code changes. Future work includes a Vite full bundle mode for dev (promising 3x faster startup, 10x fewer network requests) and stabilizing lazy barrel optimization.

Announcing Rolldown 1.0

Alexey Zerkalenkov

Rolldown, the high-performance Bundler for JavaScript, reached 1.0 stable and production readiness. It features speed, Rollup plugin compatibility, and unique bundler features.

<p>Rolldown, the high-performance Bundler for JavaScript, reached 1.0 stable and production readiness. It features speed, Rollup plugin compatibility, and unique bundler features.</p>