Rolldown

Rust-based Rollup-compatible bundler designed for the VoidZero JavaScript toolchain.

Overview

Rolldown is a high-performance JavaScript bundler written in Rust, designed as a modern alternative to traditional bundlers like Rollup and esbuild. It offers a Rollup-compatible API while achieving esbuild-level feature parity, making it a drop-in replacement for existing projects.

The bundler is optimized for speed, handling tens of thousands of modules efficiently with built-in support for transforms, code minification, source maps, and more. Rolldown is the unified bundler powering Vite 8 and beyond, and is available as free and open-source software maintained by a full-time team and community contributors.

Key features

Rust-based performance
Rollup-compatible API
esbuild feature parity
Built-in minification and source maps
Code transforms and injection
Plugin ecosystem support
Designed for Vite 8+

Pros

Significantly faster than Rollup and esbuild
Familiar Rollup API reduces migration effort
Free and open source
Handles tens of thousands of modules efficiently
Integrated with Vite ecosystem

Cons

Relatively newer project compared to established bundlers
Ecosystem may be smaller than Rollup or webpack

Use this if

You need a fast, modern bundler with Rollup compatibility; you're building with Vite; or you want to replace esbuild or Rollup with better performance.

Skip this if

You require extensive third-party plugin ecosystems; you need commercial support; or you're locked into webpack-specific workflows.

Best for

JavaScript projects requiring fast bundlingVite-based applicationsLarge codebases with thousands of modulesTeams migrating from Rollup or esbuildProjects needing Rollup API compatibility

Alternatives

RollupesbuildwebpackParcelTurbopack

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