fix: replace root when resolving dependency

packages/vite-node/src/client.ts

@@ -4,7 +4,7 @@ import vm from 'vm'
 import { dirname, extname, isAbsolute, resolve } from 'pathe'
 import { isNodeBuiltin } from 'mlly'
 import createDebug from 'debug'
-import { isPrimitive, normalizeModuleId, normalizeRequestId, slash, toFilePath } from './utils'
+import { isPrimitive, mergeSlashes, normalizeModuleId, normalizeRequestId, slash, toFilePath } from './utils'
 import type { ModuleCache, ViteNodeRunnerOptions } from './types'
 
 const debugExecute = createDebug('vite-node:client:execute')
@@ -135,7 +135,7 @@ export class ViteNodeRunner {
         if (importer && importer.startsWith('mock:'))
           importer = importer.slice(5)
         const { id } = await this.options.resolveId(dep, importer) || {}
-        dep = id && isAbsolute(id) ? `/@fs/${id}` : id || dep
+        dep = id && isAbsolute(id) ? mergeSlashes(`/@fs/${id}`) : id || dep
       }
 
       return dep

packages/vite-node/src/utils.ts

@@ -8,6 +8,10 @@ export function slash(str: string) {
   return str.replace(/\\/g, '/')
 }
 
+export function mergeSlashes(str: string) {
+  return str.replace(/\/\//g, '/')
+}
+
 export function normalizeRequestId(id: string, base?: string): string {
   if (base && id.startsWith(base))
     id = `/${id.slice(base.length)}`

packages/vitest/src/runtime/mocker.ts

@@ -100,7 +100,7 @@ export class VitestMocker {
   }
 
   public resolveDependency(dep: string) {
-    return normalizeRequestId(dep).replace(/^\/@fs\//, isWindows ? '' : '/')
+    return normalizeRequestId(dep.replace(this.root, '')).replace(/^\/@fs\//, isWindows ? '' : '/')
   }
 
   public normalizePath(path: string) {

test/core/src/dynamic-import.ts

@@ -0,0 +1,4 @@
+export async function dynamicImport(name: string) {
+  const pkg = await import(name)
+  return pkg
+}

test/core/test/mock-internals.test.ts

@@ -2,6 +2,7 @@ import childProcess, { exec } from 'child_process'
 import timers from 'timers'
 import { expect, test, vi } from 'vitest'
 import { execDefault, execHelloWorld, execImportAll } from '../src/exec'
+import { dynamicImport } from '../src/dynamic-import'
 
 vi.mock('child_process')
 vi.mock('timers') // node built in inside __mocks__
@@ -20,3 +21,10 @@ test('node internal is mocked', () => {
 test('builtin is mocked with __mocks__ folder', () => {
   expect(timers.clearInterval()).toBe('foo')
 })
+
+test('mocked dynamically imported packages', async () => {
+  const mod = await dynamicImport('timers')
+  expect(mod).toHaveProperty('default')
+  expect(mod.default).toHaveProperty('clearInterval')
+  expect(mod.default.clearInterval()).toBe('foo')
+})