# rolldown/rolldown

Fast Rust bundler for JavaScript/TypeScript with Rollup-compatible API.

Repository: https://github.com/rolldown/rolldown
Canonical: https://ross.abutalabs.com/products/rolldown
Homepage: https://rolldown.rs
Language: Rust
License: MIT
License Family: permissive
Topics: bundler, javascript, typescript
Last push: 2026-08-26T18:17:32+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 77
- inputs: {"age_days": 1080, "days_push": 7, "days_rel": 7, "gap_med": 6.0, "n_releases_24m": 95}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 13911, forks 1022 (observed 2026-08-28T04:11:05.034489+00:00)

## What it is
Rolldown is a fast JavaScript/TypeScript bundler written in Rust with a Rollup-compatible API and esbuild feature parity. It is designed to become the unified bundler powering Vite 8+ and can also be used standalone or for library bundling via tsdown.

## Use cases
- bundle a javascript or typescript application faster than rollup
- replace rollup and esbuild with a single rust bundler
- bundle a typescript library for npm publishing
- speed up vite production builds
- bundle tens of thousands of modules with minification and source maps
- migrate an existing rollup config and plugins to a faster bundler

## When to choose
- you want rollup-compatible APIs and plugin ecosystem with much faster builds
- you use Vite and want its next-generation unified bundler
- you need esbuild-style transforms, minification, and define/inject built in
- you bundle very large codebases where bundling speed matters

## When to avoid
- you rely on webpack-specific features or loaders
- you need a bundler on an unsupported platform without wasm fallback
- you require a long-proven tool with years of production hardening and prefer stability over speed

## Facets
- artifact type: library
- maturity: active
- function: build-tool, compiler, developer-tools
- domain: web-development, frontend, developer-tools
- platform: cross-platform, wasm, cli
- tags: bundler, javascript, typescript, rollup-compatible, esbuild, vite, rust, tree-shaking, minification, nodejs

## Member repositories
- rolldown/rolldown (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:05.034489+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:12:57.723287+00:00, confidence not recorded.
  - readme: https://github.com/rolldown/rolldown (fetched 2026-08-28T04:11:05.034489+00:00, sha 88dd18384bf8)
  - homepage: https://rolldown.rs (fetched 2026-08-29T08:07:01.348378+00:00, sha e4a698f7b982)
  - site_page: https://rolldown.rs/guide/getting-started (fetched 2026-08-29T08:07:01.358351+00:00, sha 57e0ec635bd6)
  - registry_crates: https://crates.io/api/v1/crates/rolldown (fetched 2026-08-29T08:07:01.361496+00:00, sha df2d27d3faaa)
- Data as of 2026-08-30T08:39:29.467469+00:00.