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Beyond Fast

ViteConf 2023

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Dep Optimization Options


  • Type: string | string[]

By default, Vite will crawl all your .html files to detect dependencies that need to be pre-bundled (ignoring node_modules, build.outDir, __tests__ and coverage). If build.rollupOptions.input is specified, Vite will crawl those entry points instead.

If neither of these fit your needs, you can specify custom entries using this option - the value should be a fast-glob pattern or array of patterns that are relative from Vite project root. This will overwrite default entries inference. Only node_modules and build.outDir folders will be ignored by default when optimizeDeps.entries is explicitly defined. If other folders need to be ignored, you can use an ignore pattern as part of the entries list, marked with an initial !.


  • Type: string[]

Dependencies to exclude from pre-bundling.


CommonJS dependencies should not be excluded from optimization. If an ESM dependency is excluded from optimization, but has a nested CommonJS dependency, the CommonJS dependency should be added to optimizeDeps.include. Example:

export default defineConfig({
  optimizeDeps: {
    include: ['esm-dep > cjs-dep'],


  • Type: string[]

By default, linked packages not inside node_modules are not pre-bundled. Use this option to force a linked package to be pre-bundled.

Experimental: If you're using a library with many deep imports, you can also specify a trailing glob pattern to pre-bundle all deep imports at once. This will avoid constantly pre-bundling whenever a new deep import is used. Give Feedback. For example:

export default defineConfig({
  optimizeDeps: {
    include: ['my-lib/components/**/*.vue'],


  • Type: Omit<EsbuildBuildOptions, | 'bundle' | 'entryPoints' | 'external' | 'write' | 'watch' | 'outdir' | 'outfile' | 'outbase' | 'outExtension' | 'metafile'>

Options to pass to esbuild during the dep scanning and optimization.

Certain options are omitted since changing them would not be compatible with Vite's dep optimization.

  • external is also omitted, use Vite's optimizeDeps.exclude option
  • plugins are merged with Vite's dep plugin


  • Type: boolean

Set to true to force dependency pre-bundling, ignoring previously cached optimized dependencies.


When enabled, it will hold the first optimized deps results until all static imports are crawled on cold start. This avoids the need for full-page reloads when new dependencies are discovered and they trigger the generation of new common chunks. If all dependencies are found by the scanner plus the explicitely defined ones in include, it is better to disable this option to let the browser process more requests in parallel.


  • Deprecated
  • Experimental: Give Feedback
  • Type: boolean | 'build' | 'dev'
  • Default: 'build'

This option is deprecated. As of Vite 5.1, pre-bundling of dependencies during build have been removed. Setting optimizeDeps.disabled to true or 'dev' disables the optimizer, and configured to false or 'build' leaves the optimizer during dev enabled.

To disable the optimizer completely, use optimizeDeps.noDiscovery: true to disallow automatic discovery of dependencies and leave optimizeDeps.include undefined or empty.


Optimizing dependencies during build time was an experimental feature. Projects trying out this strategy also removed @rollup/plugin-commonjs using build.commonjsOptions: { include: [] }. If you did so, a warning will guide you to re-enable it to support CJS only packages while bundling.


  • Experimental
  • Type: string[]

Forces ESM interop when importing these dependencies. Vite is able to properly detect when a dependency needs interop, so this option isn't generally needed. However, different combinations of dependencies could cause some of them to be prebundled differently. Adding these packages to needsInterop can speed up cold start by avoiding full-page reloads. You'll receive a warning if this is the case for one of your dependencies, suggesting to add the package name to this array in your config.

Released under the MIT License. (7b9e927a)