fix: not use default

packages/vite/src/node/env.ts

@@ -1,5 +1,5 @@
 import fs from 'node:fs'
-import dotenv, { config } from 'dotenv'
+import { config, parse } from 'dotenv'
 import { expand } from 'dotenv-expand'
 import { arraify, lookupFile } from './utils'
 import type { UserConfig } from './config'
@@ -35,7 +35,13 @@ export function loadEnv(
  rootDir: envDir
  })
  if (!path) return []
- return Object.entries(dotenv.parse(fs.readFileSync(path)))
+ try {
+ return Object.entries(parse(fs.readFileSync(path)))
+ } catch (err) {
+ throw new Error(
+ `Multiple entry points are not supported when output formats include "umd" or "iife".`
+ )
+ }
  })
  )