fix: resolving dep optimizer issues with workspace

We now use a different cache directory per project in the workspace this way we don't wind up accidentally deleting the cache directory from one project as the next one starts running.

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

@@ -1,4 +1,5 @@
 import fs from 'node:fs'
+import crypto from 'node:crypto'
 import { findUp } from 'find-up'
 import { resolve } from 'pathe'
 import { loadConfigFromFile } from 'vite'
@@ -20,8 +21,11 @@ export class VitestCache {
     return this.stats.getStats(key)
   }
 
-  static resolveCacheDir(root: string, dir: string | undefined) {
-    return resolve(root, slash(dir || 'node_modules/.vitest'))
+  static resolveCacheDir(root: string, dir: string | undefined, projectName: string | undefined) {
+    const baseDir = slash(dir || 'node_modules/.vitest')
+    return projectName
+      ? resolve(root, baseDir, crypto.createHash('md5').update(projectName, 'utf-8').digest('hex'))
+      : resolve(root, baseDir)
   }
 
   static async clearCache(options: CliOptions) {
@@ -38,11 +42,12 @@ export class VitestCache {
       : undefined
 
     const cache = config?.test?.cache
+    const projectName = config?.test?.name
 
     if (cache === false)
       throw new Error('Cache is disabled')
 
-    const cachePath = VitestCache.resolveCacheDir(root, cache?.dir)
+    const cachePath = VitestCache.resolveCacheDir(root, cache?.dir, projectName)
 
     let cleared = false
 

packages/vitest/src/node/config.ts

@@ -319,7 +319,7 @@ export function resolveConfig(
 
   resolved.cache ??= { dir: '' }
   if (resolved.cache)
-    resolved.cache.dir = VitestCache.resolveCacheDir(resolved.root, resolved.cache.dir)
+    resolved.cache.dir = VitestCache.resolveCacheDir(resolved.root, resolved.cache.dir, resolved.name)
 
   resolved.sequence ??= {} as any
   if (!resolved.sequence?.sequencer) {

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

@@ -2,6 +2,7 @@ import { searchForWorkspaceRoot, version as viteVersion } from 'vite'
 import type { DepOptimizationOptions, ResolvedConfig, UserConfig as ViteConfig } from 'vite'
 import { dirname } from 'pathe'
 import type { DepsOptimizationOptions, InlineConfig } from '../../types'
+import { VitestCache } from '../cache'
 
 export function resolveOptimizerConfig(_testOptions: DepsOptimizationOptions | undefined, viteOptions: DepOptimizationOptions | undefined, testConfig: InlineConfig) {
   const testOptions = _testOptions || {}
@@ -22,7 +23,8 @@ export function resolveOptimizerConfig(_testOptions: DepsOptimizationOptions | u
     }
   }
   else {
-    const cacheDir = testConfig.cache !== false ? testConfig.cache?.dir : null
+    const root = testConfig.root ?? process.cwd()
+    const cacheDir = testConfig.cache !== false ? testConfig.cache?.dir : undefined
     const currentInclude = (testOptions.include || viteOptions?.include || [])
     const exclude = [
       'vitest',
@@ -34,7 +36,8 @@ export function resolveOptimizerConfig(_testOptions: DepsOptimizationOptions | u
     exclude.push(...runtime)
 
     const include = (testOptions.include || viteOptions?.include || []).filter((n: string) => !exclude.includes(n))
-    newConfig.cacheDir = cacheDir ?? 'node_modules/.vitest'
+
+    newConfig.cacheDir = cacheDir ?? VitestCache.resolveCacheDir(root, cacheDir, testConfig.name)
     newConfig.optimizeDeps = {
       ...viteOptions,
       ...testOptions,