chore: support workspaces

docs/config/index.md

@@ -113,19 +113,16 @@ Handling for dependencies resolution.
 - **Version:** Since Vitest 0.29.0
 - **See also:** [Dep Optimization Options](https://vitejs.dev/config/dep-optimization-options.html)
 
-::: warning
-This feature is temporarily disabled since Vitest 0.30.0.
-:::
-
 Enable dependency optimization. If you have a lot of tests, this might improve their performance.
 
 For `jsdom` and `happy-dom` environments, when Vitest will encounter the external library, it will be bundled into a single file using esbuild and imported as a whole module. This is good for several reasons:
 
 - Importing packages with a lot of imports is expensive. By bundling them into one file we can save a lot of time
 - Importing UI libraries is expensive because they are not meant to run inside Node.js
 - Your `alias` configuration is now respected inside bundled packages
+- Code in your tests is running closer to how it's running in the browser
 
-You can opt-out of this behavior for certain packages with `exclude` option. You can read more about available options in [Vite](https://vitejs.dev/config/dep-optimization-options.html) docs.
+Be aware that only packages in `deps.experimentalOptimizer.include` option are bundled (some plugins populate this automatically, like Svelte). You can read more about available options in [Vite](https://vitejs.dev/config/dep-optimization-options.html) docs.
 
 This options also inherits your `optimizeDeps` configuration. If you redefine `include`/`exclude`/`entries` option in `deps.experimentalOptimizer` it will overwrite your `optimizeDeps` when running tests.
 

packages/vitest/src/node/plugins/index.ts

@@ -139,6 +139,8 @@ export async function VitestPlugin(options: UserConfig = {}, ctx = new Vitest('t
         const optimizer = preOptions.deps?.experimentalOptimizer
         const [major, minor] = viteVersion.split('.').map(Number)
         const allowed = major >= 5 || (major === 4 && minor >= 3)
+        if (!allowed && optimizer?.enabled === true)
+          console.warn(`Vitest: "deps.experimentalOptimizer" is only available in Vite >= 4.3.0, current Vite version: ${viteVersion}`)
         if (!allowed || optimizer?.enabled !== true) {
           optimizeConfig.cacheDir = undefined
           optimizeConfig.optimizeDeps = {
@@ -155,6 +157,7 @@ export async function VitestPlugin(options: UserConfig = {}, ctx = new Vitest('t
             ...optimizer,
             noDiscovery: true,
             disabled: false,
+            entries: [],
             exclude: ['vitest', ...builtinModules, ...(optimizer.exclude || viteConfig.optimizeDeps?.exclude || [])],
             include: (optimizer.include || viteConfig.optimizeDeps?.include || []).filter((n: string) => n !== 'vitest'),
           }

packages/vitest/src/node/plugins/workspace.ts

@@ -1,5 +1,7 @@
+import { builtinModules } from 'node:module'
 import { dirname, relative } from 'pathe'
 import type { UserConfig as ViteConfig, Plugin as VitePlugin } from 'vite'
+import { version as viteVersion } from 'vite'
 import { configDefaults } from '../../defaults'
 import { generateScopedClassName } from '../../integrations/css/css-modules'
 import { deepMerge } from '../../utils/base'
@@ -116,6 +118,35 @@ export function WorkspaceVitestPlugin(project: WorkspaceProject, options: Worksp
           }
         }
 
+        const optimizeConfig: Partial<ViteConfig> = {}
+        const optimizer = testConfig.deps?.experimentalOptimizer
+        const [major, minor] = viteVersion.split('.').map(Number)
+        const allowed = major >= 5 || (major === 4 && minor >= 3)
+        if (!allowed && optimizer?.enabled === true)
+          console.warn(`Vitest: "deps.experimentalOptimizer" is only available in Vite >= 4.3.0, current Vite version: ${viteVersion}`)
+        if (!allowed || optimizer?.enabled !== true) {
+          optimizeConfig.cacheDir = undefined
+          optimizeConfig.optimizeDeps = {
+            // experimental in Vite >2.9.2, entries remains to help with older versions
+            disabled: true,
+            entries: [],
+          }
+        }
+        else {
+          const cacheDir = testConfig.cache !== false ? testConfig.cache?.dir : null
+          optimizeConfig.cacheDir = cacheDir ?? 'node_modules/.vitest'
+          optimizeConfig.optimizeDeps = {
+            ...viteConfig.optimizeDeps,
+            ...optimizer,
+            noDiscovery: true,
+            disabled: false,
+            entries: [],
+            exclude: ['vitest', ...builtinModules, ...(optimizer.exclude || viteConfig.optimizeDeps?.exclude || [])],
+            include: (optimizer.include || viteConfig.optimizeDeps?.include || []).filter((n: string) => n !== 'vitest'),
+          }
+        }
+        Object.assign(config, optimizeConfig)
+
         return config
       },
       async configureServer(server) {