feat(vite): experimental vite-node support (#2795)

Co-authored-by: Pooya Parsa <pyapar@gmail.com>

package.json

@@ -30,6 +30,7 @@
     "jiti": "^1.13.0",
     "nitropack-dev": "link:../nitropack",
     "nuxt3": "workspace:./packages/nuxt3",
+    "vite": "^2.8.4",
     "unbuild": "^0.7.0"
   },
   "devDependencies": {

packages/nitro/src/runtime/app/render.ts

@@ -15,12 +15,12 @@ const getClientManifest = cachedImport(() => import('#build/dist/server/client.m
 const getSSRApp = !process.env.NUXT_NO_SSR && cachedImport(() => import('#build/dist/server/server.mjs'))
 
 const getSSRRenderer = cachedResult(async () => {
-  // Load client manifest
-  const clientManifest = await getClientManifest()
-  if (!clientManifest) { throw new Error('client.manifest is not available') }
   // Load server bundle
   const createSSRApp = await getSSRApp()
   if (!createSSRApp) { throw new Error('Server bundle is not available') }
+  // Load client manifest
+  const clientManifest = await getClientManifest()
+  if (!clientManifest) { throw new Error('client.manifest is not available') }
   // Create renderer
   const { renderToString } = await import('#nitro-renderer')
   return createRenderer((createSSRApp), { clientManifest, renderToString, publicPath: buildAssetsURL() }).renderToString

packages/schema/src/config/experimental.ts

@@ -3,5 +3,11 @@ export default {
    * Set to true to generate an async entrypoint for the Vue bundle (for module federation support).
    * @version 3
    */
-  asyncEntry: false
+  asyncEntry: false,
+
+  /**
+   * Use vite-node for on-demand server chunk loading
+   * @version 3
+   */
+  viteNode: process.env.EXPERIMENTAL_VITE_NODE ? true : false
 }

packages/vite/build.config.ts

@@ -3,7 +3,8 @@ import { defineBuildConfig } from 'unbuild'
 export default defineBuildConfig({
   declaration: true,
   entries: [
-    'src/index'
+    'src/index',
+    { input: 'src/runtime/', outDir: 'dist/runtime', format: 'esm' }
   ],
   dependencies: [
     'vue'

packages/vite/package.json

@@ -43,7 +43,8 @@
     "rollup-plugin-visualizer": "^5.6.0",
     "ufo": "^0.7.11",
     "unplugin": "^0.4.0",
-    "vite": "^2.8.6"
+    "vite": "^2.8.6",
+    "vite-node": "^0.6.0"
   },
   "peerDependencies": {
     "vue": "3.2.31"

packages/vite/src/client.ts

@@ -12,6 +12,7 @@ import type { ViteBuildContext, ViteOptions } from './vite'
 import { writeManifest } from './manifest'
 import { devStyleSSRPlugin } from './plugins/dev-ssr-css'
 import { DynamicBasePlugin, RelativeAssetPlugin } from './plugins/dynamic-base'
+import { viteNodePlugin } from './vite-node'
 
 export async function buildClient (ctx: ViteBuildContext) {
   const clientConfig: vite.InlineConfig = vite.mergeConfig(ctx.config, {
@@ -44,7 +45,8 @@ export async function buildClient (ctx: ViteBuildContext) {
       devStyleSSRPlugin({
         rootDir: ctx.nuxt.options.rootDir,
         buildAssetsURL: joinURL(ctx.nuxt.options.app.baseURL, ctx.nuxt.options.app.buildAssetsDir)
-      })
+      }),
+      viteNodePlugin(ctx)
     ],
     server: {
       middlewareMode: true
@@ -59,6 +61,7 @@ export async function buildClient (ctx: ViteBuildContext) {
   await ctx.nuxt.callHook('vite:extendConfig', clientConfig, { isClient: true, isServer: false })
 
   const viteServer = await vite.createServer(clientConfig)
+  ctx.clientServer = viteServer
   await ctx.nuxt.callHook('vite:serverCreated', viteServer)
 
   const viteMiddleware: Connect.NextHandleFunction = (req, res, next) => {

packages/vite/src/runtime/server.mjs

@@ -0,0 +1,54 @@
+import { promises as fs } from 'fs'
+import { fileURLToPath } from 'url'
+import { ViteNodeRunner } from 'vite-node/client'
+import { dirname, join } from 'pathe'
+
+const entry = '__NUXT_SERVER_ENTRY__'
+const url = '__NUXT_SERVER_FETCH_URL__'
+const base = '__NUXT_SERVER_BASE__'
+
+const runner = new ViteNodeRunner({
+  root: process.cwd(),
+  base,
+  async fetchModule (id) {
+    return await $fetch(url, {
+      method: 'POST',
+      body: { id }
+    })
+  }
+})
+
+const IS_CSS_RE = /\.(css|postcss|sass|scss|less|stylus|styl)(\?[^.]+)?$/
+function isCSS (file) {
+  return IS_CSS_RE.test(file)
+}
+
+async function writeManifest (extraEntries) {
+  const dir = dirname(fileURLToPath(import.meta.url))
+
+  const entries = [
+    '@vite/client',
+    'entry.mjs',
+    ...extraEntries
+  ]
+
+  const clientManifest = {
+    publicPath: '',
+    all: entries,
+    initial: entries,
+    async: [],
+    modules: {}
+  }
+
+  await fs.writeFile(join(dir, 'client.manifest.json'), JSON.stringify(clientManifest, null, 2), 'utf8')
+  await fs.writeFile(join(dir, 'client.manifest.mjs'), 'export default ' + JSON.stringify(clientManifest, null, 2), 'utf8')
+}
+
+export default (async () => {
+  const { default: render } = await runner.executeFile(entry)
+  const result = await render()
+  const modules = Array.from(runner.moduleCache.keys())
+  // Write CSS modules intro manifest to prevent FOUC
+  await writeManifest(modules.filter(i => isCSS(i)).map(i => i.slice(1)))
+  return result
+})()

packages/vite/src/server.ts

@@ -1,4 +1,4 @@
-import { join, resolve, normalize } from 'pathe'
+import { resolve, join, normalize } from 'pathe'
 import * as vite from 'vite'
 import vuePlugin from '@vitejs/plugin-vue'
 import viteJsxPlugin from '@vitejs/plugin-vue-jsx'
@@ -9,10 +9,11 @@ import { withoutTrailingSlash } from 'ufo'
 import { ViteBuildContext, ViteOptions } from './vite'
 import { wpfs } from './utils/wpfs'
 import { cacheDirPlugin } from './plugins/cache-dir'
+import { prepareDevServerEntry } from './vite-node'
 import { DynamicBasePlugin } from './plugins/dynamic-base'
+import { isCSS, isDirectory, readDirRecursively } from './utils'
 import { bundleRequest } from './dev-bundler'
 import { writeManifest } from './manifest'
-import { isCSS, isDirectory, readDirRecursively } from './utils'
 
 export async function buildServer (ctx: ViteBuildContext) {
   const _resolve = id => resolveModule(id, { paths: ctx.nuxt.options.modulesDir })
@@ -85,7 +86,7 @@ export async function buildServer (ctx: ViteBuildContext) {
     const clientDist = resolve(ctx.nuxt.options.buildDir, 'dist/client')
 
     // Remove public files that have been duplicated into buildAssetsDir
-    // TODO: Add option to configure this behaviour in vite
+    // TODO: Add option to configure this behavior in vite
     const publicDir = join(ctx.nuxt.options.srcDir, ctx.nuxt.options.dir.public)
     let publicFiles: string[] = []
     if (await isDirectory(publicDir)) {
@@ -128,6 +129,8 @@ export async function buildServer (ctx: ViteBuildContext) {
 
   // Start development server
   const viteServer = await vite.createServer(serverConfig)
+  ctx.ssrServer = viteServer
+
   await ctx.nuxt.callHook('vite:serverCreated', viteServer)
 
   // Close server on exit
@@ -136,28 +139,33 @@ export async function buildServer (ctx: ViteBuildContext) {
   // Initialize plugins
   await viteServer.pluginContainer.buildStart({})
 
-  // 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()
+  if (ctx.nuxt.options.experimental.viteNode) {
+    logger.info('Using experimental vite-node server...')
+    await prepareDevServerEntry(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 = pDebounce(_doBuild, 100)
+
+    // 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) { return }
+      doBuild()
+    })
+    // ctx.nuxt.hook('builder:watch', () => doBuild())
+    ctx.nuxt.hook('app:templatesGenerated', () => doBuild())
   }
-  const doBuild = pDebounce(_doBuild, 100)
-
-  // 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) { return }
-    doBuild()
-  })
-  // ctx.nuxt.hook('builder:watch', () => doBuild())
-  ctx.nuxt.hook('app:templatesGenerated', () => doBuild())
 }

packages/vite/src/vite-node.ts

@@ -0,0 +1,87 @@
+import { IncomingMessage } from 'http'
+import { ViteNodeServer } from 'vite-node/server'
+import fse from 'fs-extra'
+import { resolve } from 'pathe'
+import { addServerMiddleware } from '@nuxt/kit'
+import type { Connect, Plugin as VitePlugin } from 'vite'
+import { distDir } from './dirs'
+import type { ViteBuildContext } from './vite'
+
+// TODO: Remove this in favor of registerViteNodeMiddleware
+// after Nitropack or h3 fixed for adding middlewares after setup
+export function viteNodePlugin (ctx: ViteBuildContext): VitePlugin {
+  return {
+    name: 'nuxt:vite-node-server',
+    enforce: 'pre',
+    configureServer (server) {
+      server.middlewares.use('/__nuxt_vite_node__', createViteNodeMiddleware(ctx))
+    }
+  }
+}
+
+export function registerViteNodeMiddleware (ctx: ViteBuildContext) {
+  addServerMiddleware({
+    route: '/__nuxt_vite_node__/',
+    handle: createViteNodeMiddleware(ctx)
+  })
+}
+
+function createViteNodeMiddleware (ctx: ViteBuildContext): Connect.NextHandleFunction {
+  let node: ViteNodeServer | undefined
+  return async (req, res, next) => {
+    if (!node && ctx.ssrServer) {
+      node = new ViteNodeServer(ctx.ssrServer, {
+        deps: {
+          inline: [
+            ...ctx.nuxt.options.build.transpile as string[]
+          ]
+        }
+      })
+    }
+    if (!node) {
+      return next()
+    }
+
+    const body = await getBodyJson(req) || {}
+    const { id } = body
+    if (!id) {
+      res.statusCode = 400
+      res.end()
+    } else {
+      res.write(JSON.stringify(await node.fetchModule(id)))
+      res.end()
+    }
+  }
+}
+
+export async function prepareDevServerEntry (ctx: ViteBuildContext) {
+  const entryPath = resolve(ctx.nuxt.options.appDir, 'entry.async')
+  const raw = await fse.readFile(resolve(distDir, 'runtime/server.mjs'), 'utf-8')
+  const host = ctx.nuxt.options.server.host || 'localhost'
+  const port = ctx.nuxt.options.server.port || '3000'
+  const protocol = ctx.nuxt.options.server.https ? 'https' : 'http'
+  const code = raw
+    .replace('__NUXT_SERVER_FETCH_URL__', `${protocol}://${host}:${port}/__nuxt_vite_node__/`)
+    .replace('__NUXT_SERVER_ENTRY__', entryPath)
+    .replace('__NUXT_SERVER_BASE__', ctx.ssrServer.config.base || '/_nuxt/')
+  await fse.writeFile(
+    resolve(ctx.nuxt.options.buildDir, 'dist/server/server.mjs'),
+    code,
+    'utf-8'
+  )
+}
+
+function getBodyJson (req: IncomingMessage) {
+  return new Promise<any>((resolve, reject) => {
+    let body = ''
+    req.on('data', (chunk) => { body += chunk })
+    req.on('error', reject)
+    req.on('end', () => {
+      try {
+        resolve(JSON.parse(body) || {})
+      } catch (e) {
+        reject(e)
+      }
+    })
+  })
+}

packages/vite/src/vite.ts

@@ -20,6 +20,8 @@ export interface ViteOptions extends InlineConfig {
 export interface ViteBuildContext {
   nuxt: Nuxt
   config: ViteOptions
+  clientServer?: vite.ViteDevServer
+  ssrServer?: vite.ViteDevServer
 }
 
 export async function bundle (nuxt: Nuxt) {

playground/app.vue

@@ -1,6 +1,6 @@
 <template>
   <div class="app">
-    <img src="~/assets/logo.svg" class="h-20 mb-4">
+    <img src="./assets/logo.svg" class="h-20 mb-4">
     <h1 class="greeting">
       {{ hello }}, <br>Nuxt 3!
     </h1>

yarn.lock

@@ -3387,6 +3387,7 @@ __metadata:
     unbuild: latest
     unplugin: ^0.4.0
     vite: ^2.8.6
+    vite-node: ^0.6.0
     vue: 3.2.31
   peerDependencies:
     vue: 3.2.31
@@ -13386,7 +13387,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"kolorist@npm:^1.5.0":
+"kolorist@npm:^1.5.0, kolorist@npm:^1.5.1":
   version: 1.5.1
   resolution: "kolorist@npm:1.5.1"
   checksum: c113be08834fc03a24699612141c79879fceba9ff9765ad500507fb594ee4fa3465a3453ea90bbc9b0dd82f7ba5dbd79814da28e9ebaf8da27266a0088ba2714
@@ -21677,6 +21678,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"vite-node@npm:^0.6.0":
+  version: 0.6.0
+  resolution: "vite-node@npm:0.6.0"
+  dependencies:
+    kolorist: ^1.5.1
+    minimist: ^1.2.5
+    mlly: ^0.4.3
+    pathe: ^0.2.0
+    vite: ^2.8.4
+  bin:
+    vite-node: vite-node.mjs
+  checksum: 0440416b788c083af43a128242a1e5bb28ffde00867707a4251902aae223cb730c8ec6d4fc1901a00aef551d3c8f5676f4705a361584c0f5876eae952389b4c2
+  languageName: node
+  linkType: hard
+
 "vite-plugin-vue2@npm:^1.9.3":
   version: 1.9.3
   resolution: "vite-plugin-vue2@npm:1.9.3"
@@ -21708,9 +21724,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"vite@npm:^2.7.10, vite@npm:^2.8.2, vite@npm:^2.8.6":
-  version: 2.8.6
-  resolution: "vite@npm:2.8.6"
+"vite@npm:^2.8.4":
+  version: 2.8.4
+  resolution: "vite@npm:2.8.4"
   dependencies:
     esbuild: ^0.14.14
     fsevents: ~2.3.2
@@ -21733,7 +21749,7 @@ __metadata:
       optional: true
   bin:
     vite: bin/vite.js
-  checksum: 4b02d133892c98362c10214b7ad518d74b59745889197a2ba0b63260ed083fcef75a447e8fb58dbd2af8747386274b36017983d93031254df6ead38701950dcc
+  checksum: 0531ea17d354c35026c87e732d28c777492cc5165c4abdaa507c4894535ecbbfcf447fa3f270bbb160cd7cba8ad319cc86a221be18b2ccd40d8be139f9d7381d
   languageName: node
   linkType: hard