Rolldown
Rust-based JavaScript/TypeScript bundler designed to replace Rollup as Vite's bundler. Built by the Vite team with Rollup-compatible plugin API and configuration. Uses OXC for parsing (much faster than SWC/esbuild for transforms). Goal: be the bundler that powers the next generation of Vite — maintaining plugin compatibility while being 10-100x faster than JavaScript-based Rollup.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Rust implementation with memory safety. MIT licensed and fully open source. No network calls during bundling. OXC parser for fast, safe transforms.
⚡ Reliability
Best When
You're building with Vite and want to evaluate the next-generation bundler, or maintaining a Rollup-based build that will benefit from Rust-speed bundling.
Avoid When
You need production stability today — use Rollup, esbuild, or Vite's current bundler until Rolldown reaches 1.0.
Use Cases
- • Bundle JavaScript libraries and applications as a faster Rollup replacement that supports existing rollup.config.js configurations
- • Power Vite-based build pipelines with significantly faster production builds via Rolldown as Vite's bundler backend
- • Build tools and plugins using Rollup's plugin API that should also work with Rolldown with minimal changes
- • Replace slow Rollup builds in monorepos and large projects where build time is a bottleneck
- • Explore next-generation bundling performance for Node.js libraries targeting multiple output formats (ESM, CJS)
Not For
- • Production use in 2024 — Rolldown is still in active development/beta; Vite integration is not yet released
- • Projects needing 100% Rollup plugin compatibility — some plugins may not work until Rolldown reaches stable
- • Webpack-ecosystem projects — Rolldown targets Rollup compatibility, not webpack compatibility
Interface
Authentication
No authentication — local CLI/Node.js API tool.
Pricing
MIT licensed. Completely free and open source. Backed by the Vite/Evan You ecosystem.
Agent Metadata
Known Gotchas
- ⚠ Rolldown is in beta — APIs, configuration, and plugin compatibility are subject to breaking changes between versions
- ⚠ Not all Rollup plugins are compatible yet — test each plugin before migrating from Rollup
- ⚠ Rolldown's integration into Vite is a future milestone — current Vite still uses Rollup for production builds
- ⚠ Documentation is incomplete during beta phase — refer to Rollup docs for plugin API reference
- ⚠ Windows support may lag macOS/Linux during early development phases
- ⚠ Error messages during beta may be less informative than Rollup's mature error reporting
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Rolldown.
Scores are editorial opinions as of 2026-03-06.