fix: fix default import.meta.env.PROD: false (#5561)

Author: hi-ogawa

packages/vitest/src/runtime/setup-common.ts

@@ -30,7 +30,11 @@ function setupDefines(defines: Record<string, any>) {
 function setupEnv(env: Record<string, any>) {
   if (typeof process === 'undefined')
     return
-  for (const key in env)
+  // same boolean-to-string assignment as VitestPlugin.configResolved
+  const { PROD, DEV, ...restEnvs } = env
+  process.env.PROD = PROD ? '1' : ''
+  process.env.DEV = DEV ? '1' : ''
+  for (const key in restEnvs)
     process.env[key] = env[key]
 }
 

test/core/test/env.test.ts

@@ -55,9 +55,20 @@ test('define process and using import.meta.env together', () => {
 })
 
 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')
+  expect(import.meta.env.PROD).toBe(false)
+  expect(import.meta.env.DEV).toBe(true)
+  expect(process.env.PROD).toBe('')
+  expect(process.env.DEV).toBe('1')
+
+  // see https://github.com/vitest-dev/vitest/issues/5562
+  if (process.execArgv.includes('--experimental-vm-modules')) {
+    expect(import.meta.env.SSR).toBe(false)
+    expect(process.env.SSR).toBe(undefined)
+  }
+  else {
+    expect(import.meta.env.SSR).toBe(true)
+    expect(process.env.SSR).toBe('1')
+  }
 
   import.meta.env.SSR = false
   expect(import.meta.env.SSR).toEqual(false)