fix: allow module in --config (#8864)

Author: sheremet-va

packages/vitest/src/node/create.ts

@@ -8,6 +8,7 @@ import type { VitestRunMode } from './types/config'
 import { resolve } from 'node:path'
 import { deepClone, slash } from '@vitest/utils/helpers'
 import * as find from 'empathic/find'
+import { resolveModule } from 'local-pkg'
 import { mergeConfig } from 'vite'
 import { configFiles } from '../constants'
 import { Vitest } from './core'
@@ -27,7 +28,7 @@ export async function createVitest(
     = options.config === false
       ? false
       : options.config
-        ? resolve(root, options.config)
+        ? (resolveModule(options.config, { paths: [root] }) ?? resolve(root, options.config))
         : find.any(configFiles, { cwd: root })
 
   options.config = configPath

pnpm-lock.yaml

@@ -0,0 +1 @@
+export default {}

test/config/deps/test-dep-config/index.js

@@ -0,0 +1,6 @@
+{
+  "name": "@test/test-dep-config",
+  "type": "module",
+  "private": true,
+  "main": "./index.js"
+}

test/config/deps/test-dep-config/package.json

@@ -6,6 +6,7 @@
     "test": "vitest --typecheck.enabled"
   },
   "devDependencies": {
+    "@test/test-dep-config": "link:./deps/test-dep-config",
     "@vitest/browser-playwright": "workspace:*",
     "@vitest/browser-preview": "workspace:*",
     "@vitest/browser-webdriverio": "workspace:*",

test/config/package.json

@@ -0,0 +1,13 @@
+import { resolve } from 'pathe'
+import { expect, test } from 'vitest'
+import { createVitest } from 'vitest/node'
+
+test('can pass down the config as a module', async () => {
+  const vitest = await createVitest('test', {
+    config: '@test/test-dep-config',
+  })
+
+  expect(vitest.vite.config.configFile).toBe(
+    resolve(import.meta.dirname, '../deps/test-dep-config/index.js'),
+  )
+})