Providing build.rollupOptions as an array of RollupOptions objects (i.e. RollupOptions[]) doesn’t work

Describe the bug

According to the documentation for build.rollupOptions it is possible to pass the export of a Rollup config file:

This is the same as options that can be exported from a Rollup config file and will be merged with Vite’s internal Rollup options.

This doesn’t work when the export is a list of rollup options (i.e. RollupOptions[]). From what I can tell, vite just plainly doesn’t ever expect the options provided to be an array; hence, it reports “Unknown input options: 0, 1, 2, 3. Allowed options: acorn, acornInjectPlugins, …” (here, “0, 1, 2, 3” are just the enumerated keys of the object I provided which are just the array indexes of my options). Consequently, the type definitions for vite’s BuildOptions don’t include RollupOptions[] for rollupOptions either. Rollup, however, does allow an array of options (see also: https://github.com/rollup/rollup/blob/e0b10605597ea2f7ee753e6f4e1ae152d19e6508/src/rollup/types.d.ts#L929-L930).

Reproduction

(Note: I’m happy to provide a truly minimal reproduction, but I think this does just fine as the issue doesn’t really seem specific to my project beyond the nature of my build configuration.)

git clone https://github.com/kleinfreund/vue-accessible-color-picker.git
cd vue-accessible-color-picker
git switch migrate-test-suite-to-vitest
npm install

npx vite build

Expected behavior:

The build runs using the provided options just like npx rollup --config does.

Actual behavior:

The build errors (see logs section).

Reproduction

https://github.com/kleinfreund/vue-accessible-color-picker/tree/migrate-test-suite-to-vitest

System Info

System:
    OS: Linux 5.13 Ubuntu 20.04.3 LTS (Focal Fossa)
    Container: Yes
    Shell: 5.8 - /usr/bin/zsh
  Binaries:
    Node: 16.14.0 - /usr/bin/node
    Yarn: 1.22.5 - ~/.yarn/bin/yarn
    npm: 8.5.0 - ~/dev/packages/vue-accessible-color-picker/node_modules/.bin/npm
  npmPackages:
    @vitejs/plugin-vue: ^2.2.0 => 2.2.0 
    vite: ^2.8.3 => 2.8.3

Used Package Manager

npm

Logs

vite:config bundled config file loaded in 135.15ms +0ms
  vite:config using resolved config: {
  vite:config   plugins: [
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm',
  vite:config     'vite:worker',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:asset',
  vite:config     'vite:vue',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:watch-package-data',
  vite:config     'vite:build-html',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:build-import-analysis',
  vite:config     'vite:esbuild-transpile',
  vite:config     'vite:terser',
  vite:config     'vite:reporter',
  vite:config     'vite:load-fallback'
  vite:config   ],
  vite:config   build: {
  vite:config     target: [ 'es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1' ],
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     cssTarget: [ 'es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1' ],
  vite:config     sourcemap: false,
  vite:config     rollupOptions: [ [Object], [Object], [Object], [Object] ],
  vite:config     minify: 'esbuild',
  vite:config     terserOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] }
  vite:config   },
  vite:config   test: { environment: 'jsdom' },
  vite:config   define: { __VUE_OPTIONS_API__: true, __VUE_PROD_DEVTOOLS__: false },
  vite:config   ssr: { external: [ 'vue', '@vue/server-renderer' ] },
  vite:config   configFile: '/home/phil/dev/packages/vue-accessible-color-picker/vite.config.js',
  vite:config   configFileDependencies: [
  vite:config     'rollup-plugin-discard-css.js',
  vite:config     'rollup.config.js',
  vite:config     'vite.config.js'
  vite:config   ],
  vite:config   inlineConfig: {
  vite:config     root: undefined,
  vite:config     base: undefined,
  vite:config     mode: undefined,
  vite:config     configFile: undefined,
  vite:config     logLevel: undefined,
  vite:config     clearScreen: undefined,
  vite:config     build: {}
  vite:config   },
  vite:config   root: '/home/phil/dev/packages/vue-accessible-color-picker',
  vite:config   base: '/',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   publicDir: '/home/phil/dev/packages/vue-accessible-color-picker/public',
  vite:config   cacheDir: '/home/phil/dev/packages/vue-accessible-color-picker/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isProduction: true,
  vite:config   server: {
  vite:config     preTransformRequests: true,
  vite:config     fs: { strict: true, allow: [Array], deny: [Array] }
  vite:config   },
  vite:config   preview: {
  vite:config     port: undefined,
  vite:config     strictPort: undefined,
  vite:config     host: undefined,
  vite:config     https: undefined,
  vite:config     open: undefined,
  vite:config     proxy: undefined,
  vite:config     cors: undefined,
  vite:config     headers: undefined
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'production', DEV: false, PROD: true },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     warnOnce: [Function: warnOnce],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen],
  vite:config     hasErrorLogged: [Function: hasErrorLogged]
  vite:config   },
  vite:config   packageCache: Map(0) { set: [Function (anonymous)] },
  vite:config   createResolver: [Function: createResolver],
  vite:config   optimizeDeps: {
  vite:config     esbuildOptions: { keepNames: undefined, preserveSymlinks: undefined }
  vite:config   },
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: [
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object]
  vite:config     ],
  vite:config     rollupOptions: {}
  vite:config   }
  vite:config } +3ms
vite v2.8.3 building for production...
Unknown input options: 0, 1, 2, 3. Allowed options: acorn, acornInjectPlugins, cache, context, experimentalCacheExpiry, external, inlineDynamicImports, input, makeAbsoluteExternalsRelative, manualChunks, maxParallelFileReads, moduleContext, onwarn, perf, plugins, preserveEntrySignatures, preserveModules, preserveSymlinks, shimMissingExports, strictDeprecations, treeshake, watch
✓ 0 modules transformed.
Could not resolve entry module (index.html).
error during build:
Error: Could not resolve entry module (index.html).
    at error (/home/phil/dev/packages/vue-accessible-color-picker/node_modules/rollup/dist/shared/rollup.js:160:30)
    at ModuleLoader.loadEntryModule (/home/phil/dev/packages/vue-accessible-color-picker/node_modules/rollup/dist/shared/rollup.js:22421:20)
    at async Promise.all (index 0)

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it’s a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[Niputi]

reference https://github.com/vitejs/vite/issues/2039

[bluwy]

Agree with @ydcjeff here. It’s RollupOption without an array according to the types. I’ve checked the code and it would be unintuitive to support an array of options. For now calling Vite with different config files is the way to go.