fix(vite): ignore and warn if vite config file exists (#21588)

packages/vite/src/client.ts

@@ -21,6 +21,7 @@ import { createViteLogger } from './utils/logger'
 
 export async function buildClient (ctx: ViteBuildContext) {
   const clientConfig: ViteConfig = vite.mergeConfig(ctx.config, {
+    configFile: false,
     base: ctx.nuxt.options.dev
       ? joinURL(ctx.nuxt.options.app.baseURL.replace(/^\.\//, '/') || '/', ctx.nuxt.options.app.buildAssetsDir)
       : './',

packages/vite/src/server.ts

@@ -18,6 +18,7 @@ export async function buildServer (ctx: ViteBuildContext) {
   const helper = ctx.nuxt.options.nitro.imports !== false ? '' : 'globalThis.'
   const entry = ctx.nuxt.options.ssr ? ctx.entry : await resolvePath(resolve(ctx.nuxt.options.appDir, 'entry-spa'))
   const serverConfig: ViteConfig = vite.mergeConfig(ctx.config, {
+    configFile: false,
     base: ctx.nuxt.options.dev
       ? joinURL(ctx.nuxt.options.app.baseURL.replace(/^\.\//, '/') || '/', ctx.nuxt.options.app.buildAssetsDir)
       : undefined,

packages/vite/src/vite.ts

@@ -1,6 +1,6 @@
 import { existsSync } from 'node:fs'
 import * as vite from 'vite'
-import { dirname, join, resolve } from 'pathe'
+import { basename, dirname, join, resolve } from 'pathe'
 import type { Nuxt, ViteConfig } from '@nuxt/schema'
 import { addVitePlugin, isIgnored, logger, resolvePath } from '@nuxt/kit'
 import replace from '@rollup/plugin-replace'
@@ -8,6 +8,7 @@ import { sanitizeFilePath } from 'mlly'
 import { withoutLeadingSlash } from 'ufo'
 import { filename } from 'pathe/utils'
 import { resolveTSConfig } from 'pkg-types'
+import { consola } from 'consola'
 import { buildClient } from './client'
 import { buildServer } from './server'
 import virtual from './plugins/virtual'
@@ -25,6 +26,13 @@ export interface ViteBuildContext {
 }
 
 export async function bundle (nuxt: Nuxt) {
+  // https://github.com/vitejs/vite/blob/8fe69524d25d45290179175ba9b9956cbce87a91/packages/vite/src/node/constants.ts#L38
+  const viteConfigPrefix = resolve(nuxt.options.rootDir, 'vite.config')
+  const viteConfigFile = await resolvePath(viteConfigPrefix).catch(() => null)
+  if (viteConfigFile && viteConfigFile !== viteConfigPrefix) {
+    consola.warn(`Using \`${basename(viteConfigFile)}\` is not supported together with Nuxt. Use \`options.vite\` instead. You can read more in \`https://nuxt.com/docs/api/configuration/nuxt-config#vite\`.`)
+  }
+
   const useAsyncEntry = nuxt.options.experimental.asyncEntry ||
     (nuxt.options.vite.devBundler === 'vite-node' && nuxt.options.dev)
   const entry = await resolvePath(resolve(nuxt.options.appDir, useAsyncEntry ? 'entry.async' : 'entry'))