feat: allow inline workspace config

packages/vitest/src/config.ts

@@ -31,8 +31,8 @@ export function defineProject<T extends UserProjectConfigExport>(config: T): T {
   return config
 }
 
-type Workspace = (string | (UserProjectConfigExport & { extends?: string }))
+export type UserConfigWorkspaceDefinition = (string | (UserProjectConfigExport & { extends?: string }))
 
-export function defineWorkspace(config: Workspace[]): Workspace[] {
+export function defineWorkspace(config: UserConfigWorkspaceDefinition[]): UserConfigWorkspaceDefinition[] {
   return config
 }

packages/vitest/src/node/config.ts

@@ -301,7 +301,7 @@ export function resolveConfig(
     }
   }
 
-  if (resolved.workspace) {
+  if (typeof resolved.workspace === 'string' && typeof options.workspace === 'string') {
     // if passed down from the CLI and it's relative, resolve relative to CWD
     resolved.workspace = options.workspace && options.workspace[0] === '.'
       ? resolve(process.cwd(), options.workspace)

packages/vitest/src/node/core.ts

@@ -215,9 +215,11 @@ export class Vitest {
     if (!workspaceConfigPath)
       return [await this.createCoreProject()]
 
-    const workspaceModule = await this.runner.executeFile(workspaceConfigPath) as {
-      default: ReturnType<typeof defineWorkspace>
-    }
+    const workspaceModule = typeof workspaceConfigPath === 'string'
+      ? await this.runner.executeFile(workspaceConfigPath) as {
+        default: ReturnType<typeof defineWorkspace>
+      }
+      : { default: workspaceConfigPath }
 
     if (!workspaceModule.default || !Array.isArray(workspaceModule.default))
       throw new Error(`Workspace config file ${workspaceConfigPath} must export a default array of project paths.`)
@@ -309,17 +311,20 @@ export class Vitest {
       return acc
     }, {} as UserConfig)
 
+    const configPath = typeof workspaceConfigPath === 'string'
+      ? workspaceConfigPath
+      : (this.server.config.configFile || this.config.root)
     const projects = filteredWorkspaces.map(async (workspacePath) => {
       // don't start a new server, but reuse existing one
       if (
         this.server.config.configFile === workspacePath
       )
         return this.createCoreProject()
-      return initializeProject(workspacePath, this, { workspaceConfigPath, test: cliOverrides })
+      return initializeProject(workspacePath, this, { workspaceConfigPath: configPath, test: cliOverrides })
     })
 
     projectsOptions.forEach((options, index) => {
-      projects.push(initializeProject(index, this, mergeConfig(options, { workspaceConfigPath, test: cliOverrides }) as any))
+      projects.push(initializeProject(index, this, mergeConfig(options, { workspaceConfigPath: configPath, test: cliOverrides }) as any))
     })
 
     if (!projects.length)

packages/vitest/src/types/config.ts

@@ -6,6 +6,7 @@ import type { ViteNodeServerOptions } from 'vite-node'
 import type { BuiltinReporterOptions, BuiltinReporters } from '../node/reporters'
 import type { TestSequencerConstructor } from '../node/sequencers/types'
 import type { ChaiConfig } from '../integrations/chai/config'
+import type { UserConfigWorkspaceDefinition } from '../config'
 import type { CoverageOptions, ResolvedCoverageOptions } from './coverage'
 import type { JSDOMOptions } from './jsdom-options'
 import type { HappyDOMOptions } from './happy-dom-options'
@@ -345,9 +346,9 @@ export interface InlineConfig {
   poolMatchGlobs?: [string, Exclude<Pool, 'browser'>][]
 
   /**
-   * Path to a workspace configuration file
+   * Workspace configuration or a path to a workspace configuration file
    */
-  workspace?: string
+  workspace?: string | UserConfigWorkspaceDefinition[]
 
   /**
    * Update snapshot