[Vite 8] Tree-shaking fails for barrel files that combine inline exports with re-exports

[dake3601]

Describe the bug

When a barrel file mixes own exports (import X; export const y = ...) with pure re-exports (export { z } from './z'), and multiple entries import from it, Rolldown puts the entire barrel into a shared chunk — including heavy dependencies only one entry needs. This is different to what Vite + rollup does.

Reproduction

https://github.com/dake3601/rolldown-barrel-treeshake-repro

Steps to reproduce

Run npm install followed by npm run build

System Info

System:
  OS: Windows 11
Binaries:
  Node: 24.13.0
  npm: 11.6.2
npmPackages:
  vite: ^8.0.1 => 8.0.1

Used Package Manager

npm

Logs

Click to expand!

> rolldown-barrel-treeshake-repro@1.0.0 build
> npm run --workspace=app build


> app@1.0.0 build
> vite build --debug

  vite:config config file loaded in 54.70ms +0ms
  vite:env loading env files: [
  vite:env   'C:/git/rolldown-barrel-treeshake-repro/app/.env',
  vite:env   'C:/git/rolldown-barrel-treeshake-repro/app/.env.local',
  vite:env   'C:/git/rolldown-barrel-treeshake-repro/app/.env.production',
  vite:env   'C:/git/rolldown-barrel-treeshake-repro/app/.env.production.local'
  vite:env ] +0ms
  vite:env env files loaded in 0.83ms +1ms
  vite:env using resolved env: {} +1ms
  vite:config using resolved config: {
  vite:config   build: {
  vite:config     target: [ 'chrome111', 'edge111', 'firefox114', 'safari16.4', 'ios16.4' ],
  vite:config     polyfillModulePreload: true,
  vite:config     modulePreload: { polyfill: true },
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     sourcemap: false,
  vite:config     terserOptions: {},
  vite:config     rolldownOptions: {
  vite:config       platform: 'browser',
  vite:config       input: {
  vite:config         main: 'src/main.js',
  vite:config         'heavy-consumer': 'src/heavy-consumer.js'
  vite:config       }
  vite:config     },
  vite:config     commonjsOptions: { include: [ /node_modules/ ], extensions: [ '.js', '.cjs' ] },
  vite:config     dynamicImportVarsOptions: { exclude: [ /node_modules/ ] },
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     copyPublicDir: true,
  vite:config     license: false,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssrManifest: false,
  vite:config     ssrEmitAssets: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     cssCodeSplit: true,
  vite:config     minify: false,
  vite:config     rollupOptions: {
  vite:config       platform: 'browser',
  vite:config       input: {
  vite:config         main: 'src/main.js',
  vite:config         'heavy-consumer': 'src/heavy-consumer.js'
  vite:config       }
  vite:config     },
  vite:config     ssr: false,
  vite:config     emitAssets: true,
  vite:config     createEnvironment: [Function: createEnvironment],
  vite:config     cssTarget: [ 'chrome111', 'edge111', 'firefox114', 'safari16.4', 'ios16.4' ],
  vite:config     cssMinify: false
  vite:config   },
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: '() => plugins',
  vite:config     rollupOptions: {},
  vite:config     rolldownOptions: {}
  vite:config   },
  vite:config   optimizeDeps: {
  vite:config     include: [],
  vite:config     exclude: [],
  vite:config     needsInterop: [],
  vite:config     rolldownOptions: { resolve: { symlinks: true }, output: { topLevelVar: true } },
  vite:config     extensions: [],
  vite:config     disabled: undefined,
  vite:config     holdUntilCrawlEnd: true,
  vite:config     force: false,
  vite:config     ignoreOutdatedRequests: false,
  vite:config     noDiscovery: false,
  vite:config     rollupOptions: [Getter/Setter],
  vite:config     esbuildOptions: { preserveSymlinks: false }
  vite:config   },
  vite:config   environments: {
  vite:config     client: {
  vite:config       define: undefined,
  vite:config       resolve: {
  vite:config         externalConditions: [ 'node', 'module-sync' ],
  vite:config         extensions: [
  vite:config           '.mjs',  '.js',
  vite:config           '.mts',  '.ts',
  vite:config           '.jsx',  '.tsx',
  vite:config           '.json'
  vite:config         ],
  vite:config         dedupe: [],
  vite:config         noExternal: [],
  vite:config         external: [],
  vite:config         preserveSymlinks: false,
  vite:config         tsconfigPaths: false,
  vite:config         alias: [
  vite:config           {
  vite:config             find: /^\/?@vite\/env/,
  vite:config             replacement: '/@fs/C:/git/rolldown-barrel-treeshake-repro/node_modules/vite/dist/client/env.mjs'
  vite:config           },
  vite:config           {
  vite:config             find: /^\/?@vite\/client/,
  vite:config             replacement: '/@fs/C:/git/rolldown-barrel-treeshake-repro/node_modules/vite/dist/client/client.mjs'
  vite:config           }
  vite:config         ],
  vite:config         mainFields: [ 'browser', 'module', 'jsnext:main', 'jsnext' ],
  vite:config         conditions: [ 'module', 'browser', 'development|production' ],
  vite:config         builtins: []
  vite:config       },
  vite:config       keepProcessEnv: false,
  vite:config       consumer: 'client',
  vite:config       optimizeDeps: {
  vite:config         include: [],
  vite:config         exclude: [],
  vite:config         needsInterop: [],
  vite:config         rolldownOptions: { resolve: { symlinks: true }, output: { topLevelVar: true } },
  vite:config         extensions: [],
  vite:config         disabled: undefined,
  vite:config         holdUntilCrawlEnd: true,
  vite:config         force: false,
  vite:config         ignoreOutdatedRequests: false,
  vite:config         noDiscovery: false,
  vite:config         rollupOptions: [Getter/Setter],
  vite:config         esbuildOptions: { preserveSymlinks: false }
  vite:config       },
  vite:config       dev: {
  vite:config         warmup: [],
  vite:config         sourcemap: { js: true },
  vite:config         sourcemapIgnoreList: [Function: isInNodeModules],
  vite:config         preTransformRequests: true,
  vite:config         createEnvironment: [Function: defaultCreateClientDevEnvironment],
  vite:config         recoverable: true,
  vite:config         moduleRunnerTransform: false
  vite:config       },
  vite:config       build: {
  vite:config         target: [
  vite:config           'chrome111',
  vite:config           'edge111',
  vite:config           'firefox114',
  vite:config           'safari16.4',
  vite:config           'ios16.4'
  vite:config         ],
  vite:config         polyfillModulePreload: true,
  vite:config         modulePreload: { polyfill: true },
  vite:config         outDir: 'dist',
  vite:config         assetsDir: 'assets',
  vite:config         assetsInlineLimit: 4096,
  vite:config         sourcemap: false,
  vite:config         terserOptions: {},
  vite:config         rolldownOptions: {
  vite:config           platform: 'browser',
  vite:config           input: {
  vite:config             main: 'src/main.js',
  vite:config             'heavy-consumer': 'src/heavy-consumer.js'
  vite:config           }
  vite:config         },
  vite:config         commonjsOptions: { include: [ /node_modules/ ], extensions: [ '.js', '.cjs' ] },
  vite:config         dynamicImportVarsOptions: { exclude: [ /node_modules/ ] },
  vite:config         write: true,
  vite:config         emptyOutDir: null,
  vite:config         copyPublicDir: true,
  vite:config         license: false,
  vite:config         manifest: false,
  vite:config         lib: false,
  vite:config         ssrManifest: false,
  vite:config         ssrEmitAssets: false,
  vite:config         reportCompressedSize: true,
  vite:config         chunkSizeWarningLimit: 500,
  vite:config         watch: null,
  vite:config         cssCodeSplit: true,
  vite:config         minify: false,
  vite:config         rollupOptions: {
  vite:config           platform: 'browser',
  vite:config           input: {
  vite:config             main: 'src/main.js',
  vite:config             'heavy-consumer': 'src/heavy-consumer.js'
  vite:config           }
  vite:config         },
  vite:config         ssr: false,
  vite:config         emitAssets: true,
  vite:config         createEnvironment: [Function: createEnvironment],
  vite:config         cssTarget: [
  vite:config           'chrome111',
  vite:config           'edge111',
  vite:config           'firefox114',
  vite:config           'safari16.4',
  vite:config           'ios16.4'
  vite:config         ],
  vite:config         cssMinify: false
  vite:config       },
  vite:config       plugins: [
  vite:config         {
  vite:config           name: 'vite:watch-package-data',
  vite:config           buildStart: [Function: buildStart],
  vite:config           buildEnd: [Function: buildEnd],
  vite:config           watchChange: [Function: watchChange]
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-alias',
  vite:config           _options: {
  vite:config             entries: [
  vite:config               {
  vite:config                 find: /^\/?@vite\/env/,
  vite:config                 replacement: '/@fs/C:/git/rolldown-barrel-treeshake-repro/node_modules/vite/dist/client/env.mjs'
  vite:config               },
  vite:config               {
  vite:config                 find: /^\/?@vite\/client/,
  vite:config                 replacement: '/@fs/C:/git/rolldown-barrel-treeshake-repro/node_modules/vite/dist/client/client.mjs'
  vite:config               }
  vite:config             ]
  vite:config           }
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-module-preload-polyfill',
  vite:config           _options: { isServer: false }
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:resolve-builtin:get-environment',
  vite:config           buildStart: [Function: buildStart],
  vite:config           perEnvironmentStartEndDuringDev: true
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-resolve',
  vite:config           _options: {
  vite:config             resolveOptions: {
  vite:config               isBuild: true,
  vite:config               isProduction: true,
  vite:config               asSrc: true,
  vite:config               preferRelative: false,
  vite:config               isRequire: undefined,
  vite:config               root: 'C:/git/rolldown-barrel-treeshake-repro/app',
  vite:config               scan: false,
  vite:config               mainFields: [ 'browser', 'module', 'jsnext:main', 'jsnext', 'main' ],
  vite:config               conditions: [ 'module', 'browser', 'development|production' ],
  vite:config               externalConditions: [ 'node', 'module-sync' ],
  vite:config               extensions: [
  vite:config                 '.mjs',  '.js',
  vite:config                 '.mts',  '.ts',
  vite:config                 '.jsx',  '.tsx',
  vite:config                 '.json'
  vite:config               ],
  vite:config               tryIndex: true,
  vite:config               tryPrefix: undefined,
  vite:config               preserveSymlinks: false,
  vite:config               tsconfigPaths: false
  vite:config             },
  vite:config             environmentConsumer: 'client',
  vite:config             environmentName: 'client',
  vite:config             builtins: [],
  vite:config             external: [],
  vite:config             noExternal: [],
  vite:config             dedupe: [],
  vite:config             disableCache: false,
  vite:config             legacyInconsistentCjsInterop: undefined,
  vite:config             finalizeBareSpecifier: undefined,
  vite:config             finalizeOtherSpecifiers: undefined,
  vite:config             resolveSubpathImports: [Function: resolveSubpathImports],
  vite:config             yarnPnp: false
  vite:config           },
  vite:config           load: [AsyncFunction (anonymous)],
  vite:config           resolveId: [AsyncFunction (anonymous)],
  vite:config           transform: [AsyncFunction (anonymous)],
  vite:config           watchChange: [AsyncFunction (anonymous)],
  vite:config           perEnvironmentWatchChangeDuringDev: true
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:html-inline-proxy',
  vite:config           resolveId: {
  vite:config             filter: { id: /[?&]html-proxy\b/ },
  vite:config             handler: [Function: handler]
  vite:config           },
  vite:config           load: {
  vite:config             filter: { id: /[?&]html-proxy\b/ },
  vite:config             handler: [Function: handler]
  vite:config           }
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:css',
  vite:config           buildStart: [Function: buildStart],
  vite:config           buildEnd: [Function: buildEnd],
  vite:config           load: {
  vite:config             filter: {
  vite:config               id: /\.(css|less|sass|scss|styl|stylus|pcss|postcss|sss)(?:$|\?)/
  vite:config             },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           },
  vite:config           transform: {
  vite:config             filter: {
  vite:config               id: {
  vite:config                 include: /\.(css|less|sass|scss|styl|stylus|pcss|postcss|sss)(?:$|\?)/,
  vite:config                 exclude: [
  vite:config                   /[?&]commonjs-proxy/,
  vite:config                   /[?&](?:worker|sharedworker|raw|url)\b/
  vite:config                 ]
  vite:config               }
  vite:config             },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           }
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-transform',
  vite:config           _options: {
  vite:config             root: 'C:/git/rolldown-barrel-treeshake-repro/app',
  vite:config             include: [ /\.(m?ts|[jt]sx)$/ ],
  vite:config             exclude: [ /\.js$/ ],
  vite:config             jsxRefreshInclude: undefined,
  vite:config             jsxRefreshExclude: undefined,
  vite:config             isServerConsumer: false,
  vite:config             jsxInject: undefined,
  vite:config             transformOptions: { jsx: { development: false }, sourcemap: true },
  vite:config             yarnPnp: false
  vite:config           }
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-json',
  vite:config           _options: { namedExports: true, stringify: 'auto', minify: true },
  vite:config           load: [AsyncFunction (anonymous)],
  vite:config           resolveId: [AsyncFunction (anonymous)],
  vite:config           transform: [AsyncFunction (anonymous)],
  vite:config           watchChange: [AsyncFunction (anonymous)]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:wasm-helper',
  vite:config           resolveId: {
  vite:config             filter: { id: /^vite\/wasm\-helper\.js$/ },
  vite:config             handler: [Function: handler]
  vite:config           },
  vite:config           load: {
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  vite:config               id: [
  vite:config                 /^vite\/wasm\-helper\.js$/,
  vite:config                 /(?<![?#].*)\.wasm\?init/
  vite:config               ]
  vite:config             },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           },
  vite:config           renderChunk: undefined
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:worker',
  vite:config           buildStart: [Function: buildStart],
  vite:config           load: {
  vite:config             filter: { id: /(?:\?|&)(worker|sharedworker)(?:&|$)/ },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           },
  vite:config           transform: {
  vite:config             filter: { id: /(?:\?|&)worker_file&type=(\w+)(?:&|$)/ },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           },
  vite:config           renderChunk: [Function: renderChunk],
  vite:config           generateBundle: [Function: generateBundle],
  vite:config           watchChange: [Function: watchChange]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:asset',
  vite:config           perEnvironmentStartEndDuringDev: true,
  vite:config           buildStart: [Function: buildStart],
  vite:config           resolveId: {
  vite:config             filter: {
  vite:config               id: [
  vite:config                 /(\?|&)url(?:&|$)/,
  vite:config                 /\.(apng|bmp|png|jpe?g|jfif|pjpeg|pjp|gif|svg|ico|webp|avif|cur|jxl|mp4|webm|ogg|mp3|wav|flac|aac|opus|mov|m4a|vtt|woff2?|eot|ttf|otf|webmanifest|pdf|txt)(\?.*)?$/i
  vite:config               ]
  vite:config             },
  vite:config             handler: [Function: handler]
  vite:config           },
  vite:config           load: {
  vite:config             filter: {
  vite:config               id: {
  vite:config                 include: [
  vite:config                   /(\?|&)raw(?:&|$)/,
  vite:config                   /(\?|&)url(?:&|$)/,
  vite:config                   /\.(apng|bmp|png|jpe?g|jfif|pjpeg|pjp|gif|svg|ico|webp|avif|cur|jxl|mp4|webm|ogg|mp3|wav|flac|aac|opus|mov|m4a|vtt|woff2?|eot|ttf|otf|webmanifest|pdf|txt)(\?.*)?$/i
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  vite:config             },
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  vite:config           },
  vite:config           renderChunk: [Function: renderChunk],
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  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-wasm-fallback',
  vite:config           _options: undefined,
  vite:config           load: [AsyncFunction (anonymous)],
  vite:config           resolveId: [AsyncFunction (anonymous)],
  vite:config           transform: [AsyncFunction (anonymous)],
  vite:config           watchChange: [AsyncFunction (anonymous)]
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  vite:config         { name: 'vite:define', options: [Function: options] },
  vite:config         {
  vite:config           name: 'vite:css-post',
  vite:config           renderStart: [Function: renderStart],
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  vite:config                   /[?&](?:worker|sharedworker|raw|url)\b/
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  vite:config             },
  vite:config             handler: [AsyncFunction: handler]
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  vite:config           renderChunk: [AsyncFunction: renderChunk],
  vite:config           augmentChunkHash: [Function: augmentChunkHash],
  vite:config           generateBundle: [AsyncFunction: generateBundle]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:build-html',
  vite:config           transform: {
  vite:config             filter: { id: /\.html$/ },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           },
  vite:config           generateBundle: [AsyncFunction: generateBundle]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:worker-import-meta-url',
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  vite:config             },
  vite:config             handler: [AsyncFunction: handler]
  vite:config           }
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:asset-import-meta-url',
  vite:config           applyToEnvironment: [Function: applyToEnvironment],
  vite:config           transform: {
  vite:config             filter: {
  vite:config               id: {
  vite:config                 exclude: [
  vite:config                   /^vite\/preload\-helper\.js$/,
  vite:config                   /^C:\\git\\rolldown\-barrel\-treeshake\-repro\\node_modules\\vite\\dist\\client\\client\.mjs$/
  vite:config                 ]
  vite:config               },
  vite:config               code: /\bnew\s+URL\s*\(\s*('[^']+'|"[^"]+"|`[^`]+`)\s*,\s*import\.meta\.url\s*(?:,\s*)?\)/dg
  vite:config             },
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  vite:config           }
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:prepare-out-dir',
  vite:config           options: [Function: options],
  vite:config           renderStart: { order: 'pre', handler: [Function: handler] }
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-dynamic-import-vars',
  vite:config           _options: {
  vite:config             include: undefined,
  vite:config             exclude: [ /node_modules/ ],
  vite:config             resolver: [Function: resolver],
  vite:config             sourcemap: false
  vite:config           }
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-import-glob',
  vite:config           _options: {
  vite:config             root: 'C:/git/rolldown-barrel-treeshake-repro/app',
  vite:config             sourcemap: false,
  vite:config             restoreQueryExtension: false
  vite:config           }
  vite:config         },
  vite:config         {
  vite:config           name: 'vite:build-import-analysis',
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  vite:config           generateBundle: [AsyncFunction: generateBundle]
  vite:config         },
  vite:config         BuiltinPlugin {
  vite:config           enforce: undefined,
  vite:config           name: 'builtin:vite-build-import-analysis',
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  vite:config             preloadCode: `const scriptRel = 'modulepreload';const assetsURL = function(dep) { return "/"+dep };const seen = {};export const __vitePreload = function preload(baseModule, deps, importerUrl) {\n` +        
  vite:config               '\tlet promise = Promise.resolve();\n' +
  vite:config               '\tif (__VITE_IS_MODERN__ && deps && deps.length > 0) {\n' +
  vite:config               '\t\tconst links = document.getElementsByTagName("link");\n' +
  vite:config               '\t\tconst cspNonceMeta = document.querySelector("meta[property=csp-nonce]");\n' +
  vite:config               '\t\tconst cspNonce = cspNonceMeta?.nonce || cspNonceMeta?.getAttribute("nonce");\n' +
  vite:config               '\t\tfunction allSettled(promises) {\n' +
  vite:config               '\t\t\treturn Promise.all(promises.map((p) => Promise.resolve(p).then((value) => ({\n' +
  vite:config               '\t\t\t\tstatus: "fulfilled",\n' +
  vite:config               '\t\t\t\tvalue\n' +
  vite:config               '\t\t\t}), (reason) => ({\n' +
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  vite:config               '\t\t\t\treason\n' +
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vite v8.0.1 building client environment for production...
✓ 6 modules transformed.
computing gzip size...
dist/assets/heavy-consumer-DDXquPRD.js  0.15 kB │ gzip: 0.14 kB
dist/assets/main-BazsL_Cs.js            0.21 kB │ gzip: 0.18 kB
dist/assets/src-Dugf9esm.js             0.93 kB │ gzip: 0.50 kB

✓ built in 51ms

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