fix: prevent hang when process is mocked (#5430)

Author: AriPerkkio

packages/vitest/package.json

@@ -159,7 +159,7 @@
     "std-env": "^3.5.0",
     "strip-literal": "^2.0.0",
     "tinybench": "^2.5.1",
-    "tinypool": "^0.8.2",
+    "tinypool": "^0.8.3",
     "vite": "^5.0.0",
     "vite-node": "workspace:*",
     "why-is-node-running": "^2.2.2"

packages/vitest/src/runtime/workers/utils.ts

@@ -6,6 +6,10 @@ import type { WorkerRpcOptions } from './types'
 
 const REGEXP_WRAP_PREFIX = '$$vitest:'
 
+// Store global APIs in case process is overwritten by tests
+const processSend = process.send?.bind(process)
+const processOn = process.on?.bind(process)
+
 export function createThreadsRpcOptions({ port }: WorkerContext): WorkerRpcOptions {
   return {
     post: (v) => { port.postMessage(v) },
@@ -17,9 +21,9 @@ export function createForksRpcOptions(nodeV8: typeof import('v8')): WorkerRpcOpt
   return {
     serialize: nodeV8.serialize,
     deserialize: v => nodeV8.deserialize(Buffer.from(v)),
-    post(v) { process.send!(v) },
+    post(v) { processSend!(v) },
     on(fn) {
-      process.on('message', (message: any, ...extras: any) => {
+      processOn('message', (message: any, ...extras: any) => {
         // Do not react on Tinypool's internal messaging
         if ((message as TinypoolWorkerMessage)?.__tinypool_worker_message__)
           return

pnpm-lock.yaml

@@ -0,0 +1,7 @@
+import { expect, it, vi } from 'vitest'
+
+vi.stubGlobal('process', { badMock: true })
+
+it('should not hang', () => {
+  expect(1).toBe(1)
+})

test/core/test/mocked-process.test.ts

@@ -14,7 +14,8 @@ import virtualFile2 from '\0vitest-custom-virtual-file-2'
 
 // Browser mode crashes with dynamic files. Enable this when browser mode works.
 // To keep istanbul report consistent between browser and node, skip dynamic tests when istanbul is used.
-const skipDynamicFiles = '__vitest_browser__' in globalThis || globalThis.process?.env.COVERAGE_PROVIDER === 'istanbul' || !globalThis.process?.env.COVERAGE_PROVIDER
+const provider = globalThis.process?.env.COVERAGE_PROVIDER
+const skipDynamicFiles = '__vitest_browser__' in globalThis || provider === 'istanbul' || !provider
 
 const { pythagoras } = await (() => {
   if ('__vitest_browser__' in globalThis)
@@ -78,7 +79,7 @@ test('decorators', () => {
 })
 
 // Istanbul fails to follow source maps on windows
-test.skipIf(globalThis.process?.env.COVERAGE_PROVIDER === 'istanbul')('pre-transpiled code with source maps to original', async () => {
+test.runIf(provider === 'v8' || provider === 'custom')('pre-transpiled code with source maps to original', async () => {
   const transpiled = await import('../src/transpiled.js')
 
   transpiled.hello()