fix: define process variable and using import.meta.env together did not work

packages/vite-node/src/client.ts

@@ -6,7 +6,7 @@ import { fileURLToPath, pathToFileURL } from 'node:url'
 import vm from 'node:vm'
 import { resolve } from 'pathe'
 import createDebug from 'debug'
-import { VALID_ID_PREFIX, cleanUrl, isInternalRequest, isNodeBuiltin, isPrimitive, normalizeModuleId, normalizeRequestId, slash, toFilePath } from './utils'
+import { VALID_ID_PREFIX, cleanUrl, createImportMetaEnvProxy, isInternalRequest, isNodeBuiltin, isPrimitive, normalizeModuleId, normalizeRequestId, slash, toFilePath } from './utils'
 import type { HotContext, ModuleCache, ViteNodeRunnerOptions } from './types'
 import { extractSourceMap } from './source-map'
 
@@ -32,6 +32,8 @@ const clientStub = {
   removeStyle: () => {},
 }
 
+const env = createImportMetaEnvProxy()
+
 export const DEFAULT_REQUEST_STUBS: Record<string, Record<string, unknown>> = {
   '/@vite/client': clientStub,
   '@vite/client': clientStub,
@@ -299,7 +301,7 @@ export class ViteNodeRunner {
     const modulePath = cleanUrl(moduleId)
     // disambiguate the `<UNIT>:/` on windows: see nodejs/node#31710
     const href = pathToFileURL(modulePath).href
-    const meta = { url: href }
+    const meta = { url: href, env }
     const exports = Object.create(null)
     Object.defineProperty(exports, Symbol.toStringTag, {
       value: 'Module',

packages/vite-node/src/utils.ts

@@ -199,3 +199,32 @@ function traverseBetweenDirs(
     longerDir = dirname(longerDir)
   }
 }
+
+export function createImportMetaEnvProxy() {
+  // packages/vitest/src/node/plugins/index.ts:146
+  const booleanKeys = [
+    'DEV',
+    'PROD',
+    'SSR',
+  ]
+  return new Proxy(process.env, {
+    get(_, key) {
+      if (typeof key !== 'string')
+        return undefined
+      if (booleanKeys.includes(key))
+        return !!process.env[key]
+      return process.env[key]
+    },
+    set(_, key, value) {
+      if (typeof key !== 'string')
+        return true
+
+      if (booleanKeys.includes(key))
+        process.env[key] = value ? '1' : ''
+      else
+        process.env[key] = value
+
+      return true
+    },
+  })
+}

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

@@ -23,7 +23,7 @@ export function SsrReplacerPlugin(): Plugin {
         const startIndex = env.index!
         const endIndex = startIndex + env[0].length
 
-        s.overwrite(startIndex, endIndex, 'process.env')
+        s.overwrite(startIndex, endIndex, '__vite_ssr_import_meta__.env')
       }
 
       if (s) {

test/core/test/env.test.ts

@@ -47,3 +47,18 @@ test('custom env', () => {
 test('ignores import.meta.env in string literals', () => {
   expect('import.meta.env').toBe('import' + '.meta.env')
 })
+
+test('define process and using import.meta.env together', () => {
+  const process = {}
+  expect(process).toMatchObject({})
+  expect(import.meta.env.MODE).toEqual('test')
+})
+
+test('PROD, DEV, SSR should be boolean', () => {
+  expect(typeof import.meta.env.PROD).toEqual('boolean')
+  expect(typeof import.meta.env.DEV).toEqual('boolean')
+  expect(typeof import.meta.env.SSR).toEqual('boolean')
+
+  import.meta.env.SSR = false
+  expect(import.meta.env.SSR).toEqual(false)
+})