perf(nuxt): import defineNuxtConfig from nuxt/config (#7485)

packages/nuxt/config.cjs

@@ -0,0 +1,7 @@
+function defineNuxtConfig (config) {
+  return config
+}
+
+module.exports = {
+  defineNuxtConfig
+}

packages/nuxt/config.d.ts

@@ -0,0 +1,4 @@
+import { NuxtConfig } from '@nuxt/schema'
+export { NuxtConfig } from '@nuxt/schema'
+
+export declare function defineNuxtConfig(config: NuxtConfig): NuxtConfig

packages/nuxt/config.mjs

@@ -0,0 +1,5 @@
+function defineNuxtConfig (config) {
+  return config
+}
+
+export { defineNuxtConfig }

packages/nuxt/package.json

@@ -12,6 +12,11 @@
   },
   "exports": {
     ".": "./dist/index.mjs",
+    "./config": {
+      "import": "./config.mjs",
+      "require": "./config.cjs",
+      "types": "./config.d.ts"
+    },
     "./app": "./dist/app/index.mjs",
     "./package.json": "./package.json"
   },
@@ -24,7 +29,8 @@
     "app.d.ts",
     "bin",
     "types.d.ts",
-    "dist"
+    "dist",
+    "config.*"
   ],
   "scripts": {
     "prepack": "unbuild"

packages/nuxt/src/core/nuxt.ts

@@ -234,9 +234,10 @@ export async function loadNuxt (opts: LoadNuxtOptions): Promise<Nuxt> {
   return nuxt
 }
 
+/** @deprecated Use import { defineNuxtConfig } from  'nuxt/config' */
 export function defineNuxtConfig (config: NuxtConfig): NuxtConfig {
   return config
 }
 
-// For a convenience import together with `defineNuxtConfig`
+/** @deprecated Use import type { NuxtConfig } from  'nuxt/config' */
 export type { NuxtConfig }

playground/nuxt.config.ts

@@ -1,3 +1,3 @@
-import { defineNuxtConfig } from 'nuxt'
+import { defineNuxtConfig } from 'nuxt/config'
 
 export default defineNuxtConfig({})