fix!: make NODE_ENV more predictable (#10996)

Author: benmccann

Diff for: playground/ssr-vue/server.js

@@ -4,7 +4,7 @@ import path from 'node:path'
 import { fileURLToPath } from 'node:url'
 import express from 'express'
 
-const isTest = process.env.NODE_ENV === 'test' || !!process.env.VITE_TEST_BUILD
+const isTest = process.env.VITEST
 
 export async function createServer(
   root = process.cwd(),

Diff for: playground/vitestGlobalSetup.ts

@@ -9,6 +9,10 @@ const DIR = path.join(os.tmpdir(), 'vitest_playwright_global_setup')
 let browserServer: BrowserServer | undefined
 
 export async function setup(): Promise<void> {
+  process.env.NODE_ENV = process.env.VITE_TEST_BUILD
+    ? 'production'
+    : 'development'
+
   browserServer = await chromium.launchServer({
     headless: !process.env.VITE_DEBUG_SERVE,
     args: process.env.CI