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74 lines
3.0 KiB
Markdown
74 lines
3.0 KiB
Markdown
---
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title: server | Config
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outline: deep
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---
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# server <Deprecated />
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Before Vitest 4, this option was used to define the configuration for the `vite-node` server.
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At the moment, this option allows you to configure the inlining and externalization mechanisms, along with the module runner debugging configuration.
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::: warning
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These options should be used only as the last resort to improve performance by externalizing auto-inlined dependencies or to fix issues by inlining invalid external dependencies.
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Normally, Vitest should do this automatically.
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:::
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## deps
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### external
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- **Type:** `(string | RegExp)[]`
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- **Default:** files inside [`moduleDirectories`](/config/deps#moduledirectories)
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Specifies modules that should not be transformed by Vite and should instead be processed directly by the engine. These modules are imported via native dynamic `import` and bypass both transformation and resolution phases.
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```js [vitest.config.js]
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import { defineConfig } from 'vitest/config'
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export default defineConfig({
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test: {
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server: {
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deps: {
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external: ['react'],
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},
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},
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},
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})
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```
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External modules and their dependencies are not present in the module graph and will not trigger test restarts when they change.
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Typically, packages under `node_modules` are externalized.
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::: tip
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If a string is provided, it is first normalized by prefixing the `/node_modules/` or other [`moduleDirectories`](/config/deps#moduledirectories) segments (for example, `'react'` becomes `/node_modules/react/`), and the resulting string is then matched against the full file path. For example, package `@company/some-name` located inside `packages/some-name` should be specified as `some-name`, and `packages` should be included in `deps.moduleDirectories`.
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If a `RegExp` is provided, it is matched against the full file path.
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:::
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### inline
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- **Type:** `(string | RegExp)[] | true`
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- **Default:** everything that is not externalized
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Specifies modules that should be transformed and resolved by Vite. These modules are run by Vite's [module runner](https://vite.dev/guide/api-environment-runtimes#modulerunner).
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Typically, your source files are inlined.
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::: tip
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If a string is provided, it is first normalized by prefixing the `/node_modules/` or other [`moduleDirectories`](/config/deps#moduledirectories) segments (for example, `'react'` becomes `/node_modules/react/`), and the resulting string is then matched against the full file path. For example, package `@company/some-name` located inside `packages/some-name` should be specified as `some-name`, and `packages` should be included in `deps.moduleDirectories`.
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If a `RegExp` is provided, it is matched against the full file path.
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:::
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### fallbackCJS
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- **Type:** `boolean`
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- **Default:** `false`
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When a dependency is a valid ESM package, try to guess the cjs version based on the path. This might be helpful, if a dependency has the wrong ESM file.
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This might potentially cause some misalignment if a package has different logic in ESM and CJS mode.
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