rolldown 1.0.0-rc.2 on Node.js NPM

[1.0.0-rc.2] - 2026-01-28

⚡ Lazy Barrel Optimization

Skips compilation of unused re-export modules in side-effect-free barrel modules
Particularly beneficial for projects importing from large component libraries

For large component libraries like Ant Design, when you import just one component:

import { Button } from 'antd';
Button;

Metric	Without lazy barrel	With lazy barrel
Modules compiled	2986	250
Build time (macOS)	~65ms	~28ms
Build time (Windows)	~210ms	~50ms

By enabling lazy barrel, Rolldown reduces the number of compiled modules by 90% and speeds up the build by 2-4x.

Enable it in your config:

export default {
  experimental: {
    lazyBarrel: true,
  },
};

For more details, see the https://rolldown.rs/in-depth/lazy-barrel-optimization

💥 BREAKING CHANGES

expose \0rolldown/runtime in transform hook (#8068) by @hyf0
rename rolldown:runtime to \0rolldown/runtime.js (#8067) by @hyf0

🚀 Features

remove inlined constants in smart mode (#8085) by @sapphi-red
allow more options for this.emitFile with type: 'prebuilt-chunk' (#8062) by @sapphi-red
warn when both code and postBanner contain shebang (#8039) by @Copilot

🐛 Bug Fixes

update the links to Rolldown docs in the error messages (#8103) by @sapphi-red
handle tsconfig.json load errors (#8105) by @sapphi-red
include inlined constants in namespace object (#8099) by @sapphi-red
vite test ci (#8084) by @IWANABETHATGUY
renamer: nested binding shadowing external module namespace in UMD/IIFE formats (#8083) by @Dunqing
deduplicate ESM chunk imports by canonical symbol (#8059) by @IWANABETHATGUY
refine side-effect detection for BigInt and RegExp (#8060) by @IWANABETHATGUY
rust: use string literal span for new URL error diagnostic (#8043) by @valadaptive
rust: use ModuleType::Asset for new URL imports (#8035) by @valadaptive
CJS-ESM interop - property assignment on CJS module exports (#8006) by @IWANABETHATGUY
eliminate the facade chunk if the dynamic entry module has been merged into common chunk (#8046) by @IWANABETHATGUY
Inlining dynamic imports broken with multiple entry points (#8037) by @IWANABETHATGUY
devtools: revert Chunk#id to Chunk#chunk_id (#8040) by @hyf0
invert __exportAll parameter logic to reduce default output size (#8036) by @Copilot
</script tag search should be case insensitive (#8033) by @IWANABETHATGUY
use directory name as-is for the variable name even if the name contained . (#8029) by @Copilot
dev/lazy: remove unnecessary rewrite from top level this to undefined (#8020) by @hyf0
dev/lazy: should keep lazy entries imports for patch file (#8019) by @hyf0
output.generatedCode.preset: 'es2015' was not set by default (#8026) by @sapphi-red
node: align option validator to types (#8023) by @sapphi-red
node: allow output.strictExecutionOrder by the option validator (#8022) by @sapphi-red
types: return this from on / off methods of RolldownWatcher (#8015) by @sapphi-red

🚜 Refactor

rolldown_plugin_vite_dynamic_import_vars: remove v1 implementation (#8096) by @shulaoda
rolldown_plugin_vite_import_glob: remove v1 implementation (#8095) by @shulaoda
lazy-barrel: restructure lazy barrel implementation (#8070) by @shulaoda
remove use_built_ins and use_spread from internal JSX options (#8079) by @sapphi-red
remove experimental.transformHiresSourcemap (#8055) by @Copilot
rust: use is_data_url more consistently (#8042) by @valadaptive
use FxIndexMap to store EntryPoint (#8032) by @IWANABETHATGUY
node: add type checks that ensures validator schema is up to date with types (#8024) by @sapphi-red

📚 Documentation

link to vite plugin registry (#8086) by @sapphi-red
lazy-barrel: improve documentation and enable in sidebar (#8072) by @shulaoda
add more examples and details (#8054) by @sapphi-red
in-depth: add dead code elimination page (#8007) by @sapphi-red
update status from beta to release candidate (#8012) by @shulaoda

⚡ Performance

run inline-const pass for modules that are affected by inlining (#8064) by @sapphi-red

🧪 Testing

lazy-barrel: use package.json sideEffects instead of plugin hook (#8077) by @shulaoda
lazy-barrel: enable tests and add treeshake-behavior cases (#8071) by @shulaoda

⚙️ Miscellaneous Tasks

deps: update crate-ci/typos action to v1.42.3 (#8087) by @renovate[bot]
deps: update rollup submodule for tests to v4.56.0 (#8073) by @sapphi-red
deps: update oxc to v0.111.0 (#8063) by @renovate[bot]
deps: update dependency rolldown-plugin-dts to v0.21.6 (#8076) by @renovate[bot]
deps: update test262 submodule for tests (#8074) by @sapphi-red
deps: update crate-ci/typos action to v1.42.2 (#8069) by @renovate[bot]
deps: update oxc apps (#8066) by @renovate[bot]
remove {@include ./foo.md} from d.ts files (#8056) by @sapphi-red
deps: update dependency oxlint-tsgolint to v0.11.2 (#8057) by @renovate[bot]
deps: update github-actions (#8050) by @renovate[bot]
deps: update npm packages (#8051) by @renovate[bot]
deps: update rust crates (#8049) by @renovate[bot]
debug: add IdxExt debug trait for human-readable index debugging (#8045) by @IWANABETHATGUY
deps: update dependency rolldown-plugin-dts to v0.21.5 (#8034) by @renovate[bot]
deps: update oxc resolver to v11.16.4 (#8031) by @renovate[bot]
deps: update dependency rolldown-plugin-dts to v0.21.4 (#8030) by @renovate[bot]
deps: update dependency rust to v1.93.0 (#8018) by @renovate[bot]
archive 2025 beta changelog (#8014) by @shulaoda
update release workflow version pattern from beta to rc (#8013) by @shulaoda

❤️ New Contributors

@valadaptive made their first contribution in #8043

Co-authored-by: shulaoda 165626830+shulaoda@users.noreply.github.com

rolldown 1.0.0-rc.2 v1.0.0-rc.2 on Node.js NPM