高速バンドラーRolldown、ついに1.0へ

TL;DR: Rolldown, the high-performance Bundler for JavaScript, reached 1.0 stable and production readiness. It features speed, Rollup plugin compatibility, and unique bundler features. Upgrading from the latest RC does not need any code changes.Rolldown reaches 1.0 ​Rolldown is a Rust-based high-performance JavaScript bundler. It can be used standalone and is powering Vite since its latest major version Vite 8. Now Rolldown itself hits the 1.0 stable milestone.Rolldown adheres to semantic versioning meaing the ^1.0.0 API is now locked:Option names, types, and plugin hook signatures stay backward-compatible.No planned breaking changes to Rolldown's public API.Except for features marked experimental.Output behavior may still changeOutput behavior like Dead Code Elimination, chunking, and inlining heuristics will keep improving, and option defaults may shift to deliver smaller and faster bundles. This does NOT change the runtime behavior of the output. Behavioral changes are noted in release notes.Built with Vite in mind ​One of Rolldown's main goals was to unify Vite's original 2-bundler setup. The previous configuration worked, but it meant two transformation pipelines, two plugin systems, and a growing layer of glue code. It also limited Vite's future capabilities.Rolldown solved this as a bundler by combining the best parts of existing bundlers. esbuild's speed and Rollup's plugin API. In addition, the bundler provides features neither had. (More on this below)Swapping Vite's bundler was a 2 year journey. How we got here:April 2024: First public 0.10.1 release.December 2024: 1.0.0-beta.1, scoping the eventual 1.0 surface area.May 2025: rolldown-vite, a temporary package, shipped as a technical preview to prepare for the swap and gather feedback from the community.December 2025: Vite 8 beta shipped with Rolldown as the default bundler.January 2026: Rolldown 1.0 RC marked API stability.March 2026: Vite 8 stable shipped, making Rolldown the underlying bundler for every Vite user.May 2026: Rolldown 1.0 stable.Vite 8 is now Rolldown's main entry point. Meaning new Rolldown features and improvements directly benefit Vite users.Why switch to Rolldown ​Rolldown is a native bundler that combines speed and flexibility through it's plugin API. On top of that, it has unique features that improve the bundling experience and output quality.esbuild-like speedRollup plugin-compatibilityAdditional bundler featuresCompanies like Framer and PLAID are already using Rolldown in production.esbuild-like speed ​Rolldown is 10x-30x faster than Rollup (the gap widens as project size grows) and on par with esbuild. Performance is a feature. Rolldown is written in Rust and leverages Oxc to handle the language work like parsing and minification.Highlights:Ramp reduced their build time by 57%Mercedes-Benz.io cut their build time down by up to 38%Beehiiv reduced their build time by 64%Full benchmarks: rolldown/benchmarks.Rollup plugin-compatibility ​Rolldown needed a Rollup-compatible plugin API to be a drop-in replacement for Vite. Otherwise, developers would have to make massive code changes to migrate to the latest Vite, which is a terrible experience. It also ensures users can continue using their existing plugins. Most Vite plugins work out of the box on Vite 8.With Rolldown being written in native Rust, there was performance improvement opportunities in the plugin API too:Hook filters keep JavaScript plugins out of the hot path. Plugins that declare an id, code, or moduleType filter skip the Rust-to-JS hop when the filter doesn't match, so adding plugins doesn't linearly slow your build. For plugins that don't ship filters yet, withFilter wraps them on the consumer side.Built-in plugins replace common Rollup-ecosystem dependencies in Rust. replacePlugin and esmExternalRequirePlugin drop into existing configs without the JavaScript hop.The Plugin API reference covers the full API surface.Additional bundler features ​Smaller default bundles. Aggressive dead code elimination with @__PURE__, @__NO_SIDE_EFFECTS__, and sideEffects controls; smart constant and TypeScript const enum inlining; and DCE-only minification that strips dead code without mangling identifiers.More chunking control. Granular code splitting with webpack-style chunk rules, the same feature behind Framer's 67% chunk reduction.For the full list, see Notable Features.Using Rolldown ​Standalone ​vpnpmpnpmyarnbunsh$ vp add -D rolldownsh$ npm install -D rolldownsh$ pnpm add -D rolldownsh$ yarn add -D rolldownsh$ bun add -D rolldownjsimport { defineConfig } from 'rolldown'

export default defineConfig({

input: 'src/main.ts',

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