fix(vite-node): expose all envs from .env file, not just with a prefix VITE_ (#6017)

Author: sheremet-va

Diff for: packages/vite-node/src/cli.ts

@@ -1,7 +1,7 @@
 import { resolve } from 'node:path'
 import cac from 'cac'
 import c from 'picocolors'
-import { createServer } from 'vite'
+import { createServer, loadEnv } from 'vite'
 import { version } from '../package.json'
 import { ViteNodeServer } from './server'
 import { ViteNodeRunner } from './client'
@@ -95,6 +95,12 @@ async function run(files: string[], options: CliOptions = {}) {
   })
   await server.pluginContainer.buildStart({})
 
+  const env = loadEnv(server.config.mode, server.config.envDir, '')
+
+  for (const key in env) {
+    process.env[key] ??= env[key]
+  }
+
   const node = new ViteNodeServer(server, serverOptions)
 
   installSourcemapsSupport({

Diff for: test/vite-node/.env.local

@@ -0,0 +1 @@
+MY_TEST_ENV=hello

Diff for: test/vite-node/src/cli-print-env.js

@@ -0,0 +1,2 @@
+// eslint-disable-next-line no-console
+console.log(JSON.stringify(process.env, null, 2))

Diff for: test/vite-node/test/cli.test.ts

@@ -39,6 +39,12 @@ it('script args in -- after', async () => {
   expect(parseResult(cli1.stdout)).include('--version').include('--help')
 })
 
+it('exposes .env variables', async () => {
+  const { stdout } = await runViteNodeCli(resolve(__dirname, '../src/cli-print-env.js'))
+  const env = JSON.parse(stdout)
+  expect(env.MY_TEST_ENV).toBe('hello')
+})
+
 it.each(['index.js', 'index.cjs', 'index.mjs'])('correctly runs --watch %s', async (file) => {
   const entryPath = resolve(__dirname, '../src/watch', file)
   const { viteNode } = await runViteNodeCli('--watch', entryPath)