From 39747ce095c4b17e8a36381a91d34e6e2f889cb9 Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@roe.dev>
Date: Mon, 6 Feb 2023 15:25:24 -0800
Subject: [PATCH] perf(vite): use stub entry in vite server build when `ssr:
 false ` (#18782)

---
 packages/nuxt/src/app/entry-spa.ts |  1 +
 packages/vite/src/server.ts        | 11 ++++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)
 create mode 100644 packages/nuxt/src/app/entry-spa.ts

diff --git a/packages/nuxt/src/app/entry-spa.ts b/packages/nuxt/src/app/entry-spa.ts
new file mode 100644
index 000000000..ead516c97
--- /dev/null
+++ b/packages/nuxt/src/app/entry-spa.ts
@@ -0,0 +1 @@
+export default () => {}
diff --git a/packages/vite/src/server.ts b/packages/vite/src/server.ts
index 085db8f5d..13d27690b 100644
--- a/packages/vite/src/server.ts
+++ b/packages/vite/src/server.ts
@@ -2,7 +2,7 @@ import { resolve } from 'pathe'
 import * as vite from 'vite'
 import vuePlugin from '@vitejs/plugin-vue'
 import viteJsxPlugin from '@vitejs/plugin-vue-jsx'
-import { logger, resolveModule } from '@nuxt/kit'
+import { logger, resolveModule, resolvePath } from '@nuxt/kit'
 import { joinURL, withoutLeadingSlash, withTrailingSlash } from 'ufo'
 import type { ViteBuildContext, ViteOptions } from './vite'
 import { cacheDirPlugin } from './plugins/cache-dir'
@@ -14,8 +14,9 @@ import { transpile } from './utils/transpile'
 export async function buildServer (ctx: ViteBuildContext) {
   const _resolve = (id: string) => resolveModule(id, { paths: ctx.nuxt.options.modulesDir })
   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: vite.InlineConfig = vite.mergeConfig(ctx.config, {
-    entry: ctx.entry,
+    entry,
     base: ctx.nuxt.options.dev
       ? joinURL(ctx.nuxt.options.app.baseURL.replace(/^\.\//, '/') || '/', ctx.nuxt.options.app.buildAssetsDir)
       : undefined,
@@ -47,7 +48,7 @@ export async function buildServer (ctx: ViteBuildContext) {
       'typeof XMLHttpRequest': '"undefined"'
     },
     optimizeDeps: {
-      entries: [ctx.entry]
+      entries: ctx.nuxt.options.ssr ? [ctx.entry] : []
     },
     resolve: {
       alias: {
@@ -82,9 +83,9 @@ export async function buildServer (ctx: ViteBuildContext) {
     build: {
       sourcemap: ctx.nuxt.options.sourcemap.server ? ctx.config.build?.sourcemap ?? true : false,
       outDir: resolve(ctx.nuxt.options.buildDir, 'dist/server'),
-      ssr: ctx.nuxt.options.ssr ?? true,
+      ssr: true,
       rollupOptions: {
-        input: ctx.entry,
+        input: entry,
         external: ['#internal/nitro', ...ctx.nuxt.options.experimental.externalVue ? ['vue', 'vue-router'] : []],
         output: {
           entryFileNames: 'server.mjs',