refactor(vite): reuse logics and improve code splitting

packages/vite/src/dev-bundler.ts

@@ -1,11 +1,17 @@
 import { pathToFileURL } from 'node:url'
 import { existsSync } from 'node:fs'
 import { builtinModules } from 'node:module'
-import { isAbsolute, resolve } from 'pathe'
+import { isAbsolute, normalize, resolve } from 'pathe'
 import * as vite from 'vite'
-import { ExternalsOptions, isExternal as _isExternal, ExternalsDefaults } from 'externality'
+import { isExternal } from 'externality'
 import { genDynamicImport, genObjectFromRawEntries } from 'knitwork'
-import { hashId, uniq } from './utils'
+import fse from 'fs-extra'
+import { debounce } from 'perfect-debounce'
+import { isIgnored, logger } from '@nuxt/kit'
+import { hashId, isCSS, uniq } from './utils'
+import { createIsExternal } from './utils/external'
+import { writeManifest } from './manifest'
+import { ViteBuildContext } from './vite'
 
 export interface TransformChunk {
   id: string,
@@ -23,29 +29,7 @@ export interface SSRTransformResult {
 
 export interface TransformOptions {
   viteServer: vite.ViteDevServer
-}
-
-function isExternal (opts: TransformOptions, id: string) {
-  // Externals
-  const ssrConfig = (opts.viteServer.config as any).ssr
-
-  const externalOpts: ExternalsOptions = {
-    inline: [
-      /virtual:/,
-      /\.ts$/,
-      ...ExternalsDefaults.inline,
-      ...ssrConfig.noExternal
-    ],
-    external: [
-      ...ssrConfig.external,
-      /node_modules/
-    ],
-    resolve: {
-      type: 'module',
-      extensions: ['.ts', '.js', '.json', '.vue', '.mjs', '.jsx', '.tsx', '.wasm']
-    }
-  }
-  return _isExternal(id, opts.viteServer.config.root, externalOpts)
+  isExternal(id: string): ReturnType<typeof isExternal>
 }
 
 async function transformRequest (opts: TransformOptions, id: string) {
@@ -74,7 +58,7 @@ async function transformRequest (opts: TransformOptions, id: string) {
   // Vite will add ?v=123 to bypass browser cache
   // Remove for externals
   const withoutVersionQuery = id.replace(/\?v=\w+$/, '')
-  if (await isExternal(opts, withoutVersionQuery)) {
+  if (await opts.isExternal(withoutVersionQuery)) {
     const path = builtinModules.includes(withoutVersionQuery.split('node:').pop())
       ? withoutVersionQuery
       : isAbsolute(withoutVersionQuery) ? pathToFileURL(withoutVersionQuery).href : withoutVersionQuery
@@ -245,3 +229,36 @@ async function __instantiateModule__(url, urlStack) {
     ids: chunks.map(i => i.id)
   }
 }
+
+export async function initViteDevBundler (ctx: ViteBuildContext, onBuild: () => Promise<any>) {
+  const viteServer = ctx.ssrServer
+  const options: TransformOptions = {
+    viteServer,
+    isExternal: createIsExternal(viteServer, ctx.nuxt.options.rootDir)
+  }
+
+  // Build and watch
+  const _doBuild = async () => {
+    const start = Date.now()
+    const { code, ids } = await bundleRequest(options, resolve(ctx.nuxt.options.appDir, 'entry'))
+    await fse.writeFile(resolve(ctx.nuxt.options.buildDir, 'dist/server/server.mjs'), code, 'utf-8')
+    // Have CSS in the manifest to prevent FOUC on dev SSR
+    await writeManifest(ctx, ids.filter(isCSS).map(i => i.slice(1)))
+    const time = (Date.now() - start)
+    logger.success(`Vite server built in ${time}ms`)
+    await onBuild()
+  }
+  const doBuild = debounce(_doBuild)
+
+  // Initial build
+  await _doBuild()
+
+  // Watch
+  viteServer.watcher.on('all', (_event, file) => {
+    file = normalize(file) // Fix windows paths
+    if (file.indexOf(ctx.nuxt.options.buildDir) === 0 || isIgnored(file)) { return }
+    doBuild()
+  })
+  // ctx.nuxt.hook('builder:watch', () => doBuild())
+  ctx.nuxt.hook('app:templatesGenerated', () => doBuild())
+}

packages/vite/src/server.ts

@@ -1,22 +1,16 @@
 import { resolveTSConfig } from 'pkg-types'
-import { resolve, normalize } from 'pathe'
+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, isIgnored } from '@nuxt/kit'
-import fse from 'fs-extra'
-import { debounce } from 'perfect-debounce'
+import { logger, resolveModule } from '@nuxt/kit'
 import { joinURL, withoutLeadingSlash, withTrailingSlash } from 'ufo'
 import { ViteBuildContext, ViteOptions } from './vite'
 import { wpfs } from './utils/wpfs'
 import { cacheDirPlugin } from './plugins/cache-dir'
-import { prepareDevServerEntry } from './vite-node'
-import { isCSS } from './utils'
-import { bundleRequest } from './dev-bundler'
-import { writeManifest } from './manifest'
 
 export async function buildServer (ctx: ViteBuildContext) {
-  const _resolve = id => resolveModule(id, { paths: ctx.nuxt.options.modulesDir })
+  const _resolve = (id: string) => resolveModule(id, { paths: ctx.nuxt.options.modulesDir })
   const serverConfig: vite.InlineConfig = vite.mergeConfig(ctx.config, {
     base: ctx.nuxt.options.dev
       ? joinURL(ctx.nuxt.options.app.baseURL.replace(/^\.\//, '/') || '/', ctx.nuxt.options.app.buildAssetsDir)
@@ -149,31 +143,8 @@ export async function buildServer (ctx: ViteBuildContext) {
 
   if (ctx.nuxt.options.experimental.viteNode) {
     logger.info('Vite server using experimental `vite-node`...')
-    await prepareDevServerEntry(ctx)
+    await import('./vite-node').then(r => r.initViteNodeServer(ctx))
   } else {
-    // Build and watch
-    const _doBuild = async () => {
-      const start = Date.now()
-      const { code, ids } = await bundleRequest({ viteServer }, resolve(ctx.nuxt.options.appDir, 'entry'))
-      await fse.writeFile(resolve(ctx.nuxt.options.buildDir, 'dist/server/server.mjs'), code, 'utf-8')
-      // Have CSS in the manifest to prevent FOUC on dev SSR
-      await writeManifest(ctx, ids.filter(isCSS).map(i => i.slice(1)))
-      const time = (Date.now() - start)
-      logger.success(`Vite server built in ${time}ms`)
-      await onBuild()
-    }
-    const doBuild = debounce(_doBuild)
-
-    // Initial build
-    await _doBuild()
-
-    // Watch
-    viteServer.watcher.on('all', (_event, file) => {
-      file = normalize(file) // Fix windows paths
-      if (file.indexOf(ctx.nuxt.options.buildDir) === 0 || isIgnored(file)) { return }
-      doBuild()
-    })
-    // ctx.nuxt.hook('builder:watch', () => doBuild())
-    ctx.nuxt.hook('app:templatesGenerated', () => doBuild())
+    await import('./dev-bundler').then(r => r.initViteDevBundler(ctx, onBuild))
   }
 }

packages/vite/src/utils/external.ts

@@ -0,0 +1,23 @@
+import { ExternalsOptions, ExternalsDefaults, isExternal } from 'externality'
+import { ViteDevServer } from 'vite'
+
+export function createIsExternal (viteServer: ViteDevServer, rootDir: string) {
+  const externalOpts: ExternalsOptions = {
+    inline: [
+      /virtual:/,
+      /\.ts$/,
+      ...ExternalsDefaults.inline,
+      ...viteServer.config.ssr.noExternal as string[]
+    ],
+    external: [
+      ...viteServer.config.ssr.external,
+      /node_modules/
+    ],
+    resolve: {
+      type: 'module',
+      extensions: ['.ts', '.js', '.json', '.vue', '.mjs', '.jsx', '.tsx', '.wasm']
+    }
+  }
+
+  return (id:string) => isExternal(id, rootDir, externalOpts)
+}

packages/vite/src/vite-node.ts

@@ -5,11 +5,11 @@ import fse from 'fs-extra'
 import { resolve } from 'pathe'
 import { addServerMiddleware } from '@nuxt/kit'
 import type { Plugin as VitePlugin, ViteDevServer } from 'vite'
-import { ExternalsOptions, isExternal, ExternalsDefaults } from 'externality'
 import { resolve as resolveModule } from 'mlly'
 import { distDir } from './dirs'
 import type { ViteBuildContext } from './vite'
 import { isCSS } from './utils'
+import { createIsExternal } from './utils/external'
 
 // TODO: Remove this in favor of registerViteNodeMiddleware
 // after Nitropack or h3 fixed for adding middlewares after setup
@@ -72,27 +72,11 @@ function createViteNodeMiddleware (ctx: ViteBuildContext) {
         web: []
       }
     })
-    const externalOpts: ExternalsOptions = {
-      inline: [
-        /virtual:/,
-        /\.ts$/,
-        ...ExternalsDefaults.inline,
-        ...viteServer.config.ssr.noExternal as string[]
-      ],
-      external: [
-        ...viteServer.config.ssr.external,
-        /node_modules/
-      ],
-      resolve: {
-        type: 'module',
-        extensions: ['.ts', '.js', '.json', '.vue', '.mjs', '.jsx', '.tsx', '.wasm']
-      }
-    }
-    const rootDir = ctx.nuxt.options.rootDir
+    const isExternal = createIsExternal(viteServer, ctx.nuxt.options.rootDir)
     node.shouldExternalize = async (id: string) => {
-      const result = await isExternal(id, rootDir, externalOpts)
+      const result = await isExternal(id)
       if (result?.external) {
-        return resolveModule(result.id, { url: rootDir })
+        return resolveModule(result.id, { url: ctx.nuxt.options.rootDir })
       }
       return false
     }
@@ -110,7 +94,7 @@ function createViteNodeMiddleware (ctx: ViteBuildContext) {
   return app.nodeHandler
 }
 
-export async function prepareDevServerEntry (ctx: ViteBuildContext) {
+export async function initViteNodeServer (ctx: ViteBuildContext) {
   let entryPath = resolve(ctx.nuxt.options.appDir, 'entry.async.mjs')
   if (!fse.existsSync(entryPath)) {
     entryPath = resolve(ctx.nuxt.options.appDir, 'entry.async')