perf(dev): improve cold start of dev server

knip.json

@@ -11,6 +11,7 @@
     },
     "packages/nuxt-cli/playground": {
       "ignoreDependencies": [
+        "@nuxt/test-utils",
         "nuxt"
       ]
     },
@@ -21,6 +22,7 @@
         "clipboardy",
         "consola",
         "defu",
+        "exsolve",
         "fuse.js",
         "giget",
         "h3",

packages/nuxi/bin/nuxi.mjs

@@ -6,6 +6,7 @@ import { runMain } from '../dist/index.mjs'
 globalThis.__nuxt_cli__ = {
   startTime: Date.now(),
   entry: fileURLToPath(import.meta.url),
+  devEntry: fileURLToPath(new URL('../dist/dev/index.mjs', import.meta.url)),
 }
 
 runMain()

packages/nuxi/build.config.ts

@@ -27,7 +27,10 @@ export default defineBuildConfig({
       exportConditions: ['production', 'node'],
     },
   },
-  entries: ['src/index'],
+  entries: [
+    'src/index',
+    'src/dev/index.ts',
+  ],
   externals: [
     '@nuxt/test-utils',
     'fsevents',

packages/nuxi/package.json

@@ -50,6 +50,7 @@
     "clipboardy": "^4.0.0",
     "consola": "^3.4.2",
     "defu": "^6.1.4",
+    "exsolve": "^1.0.5",
     "fuse.js": "^7.1.0",
     "giget": "^2.0.0",
     "h3": "^1.15.3",

packages/nuxi/src/commands/build.ts

@@ -37,7 +37,7 @@ export default defineCommand({
 
     const cwd = resolve(ctx.args.cwd || ctx.args.rootDir)
 
-    await showVersions(cwd)
+    showVersions(cwd)
 
     const kit = await loadKit(cwd)
 

packages/nuxi/src/commands/dev-child.ts

@@ -1,15 +1,8 @@
-import type { NuxtDevContext, NuxtDevIPCMessage } from '../utils/dev'
-
 import process from 'node:process'
-
 import { defineCommand } from 'citty'
-import defu from 'defu'
 import { resolve } from 'pathe'
 import { isTest } from 'std-env'
 
-import { _getDevServerDefaults, _getDevServerOverrides, createNuxtDevServer } from '../utils/dev'
-import { overrideEnv } from '../utils/env'
-import { logger } from '../utils/logger'
 import { cwdArgs, dotEnvArgs, envNameArgs, legacyRootDirArgs, logLevelArgs } from './_shared'
 
 export default defineCommand({
@@ -23,80 +16,20 @@ export default defineCommand({
     ...envNameArgs,
     ...dotEnvArgs,
     ...legacyRootDirArgs,
+    clear: {
+      type: 'boolean',
+      description: 'Clear console on restart',
+      negativeDescription: 'Disable clear console on restart',
+    },
   },
   async run(ctx) {
     if (!process.send && !isTest) {
-      logger.warn('`nuxi _dev` is an internal command and should not be used directly. Please use `nuxi dev` instead.')
+      console.warn('`nuxi _dev` is an internal command and should not be used directly. Please use `nuxi dev` instead.')
     }
 
-    // Prepare
-    overrideEnv('development')
     const cwd = resolve(ctx.args.cwd || ctx.args.rootDir)
 
-    // Get dev context info
-    const devContext: NuxtDevContext = JSON.parse(process.env.__NUXT_DEV__ || 'null') || {}
-
-    // IPC Hooks
-    function sendIPCMessage<T extends NuxtDevIPCMessage>(message: T) {
-      if (process.send) {
-        process.send(message)
-      }
-      else {
-        logger.info(
-          'Dev server event:',
-          Object.entries(message)
-            .map(e => `${e[0]}=${JSON.stringify(e[1])}`)
-            .join(' '),
-        )
-      }
-    }
-
-    process.once('unhandledRejection', (reason) => {
-      sendIPCMessage({ type: 'nuxt:internal:dev:rejection', message: reason instanceof Error ? reason.toString() : 'Unhandled Rejection' })
-      process.exit()
-    })
-
-    const devServerOverrides = _getDevServerOverrides({
-      public: devContext.public,
-    })
-
-    const devServerDefaults = _getDevServerDefaults({
-      hostname: devContext.hostname,
-      https: devContext.proxy?.https,
-    }, devContext.publicURLs)
-
-    // Init Nuxt dev
-    const nuxtDev = await createNuxtDevServer({
-      cwd,
-      overrides: defu(ctx.data?.overrides, devServerOverrides),
-      defaults: devServerDefaults,
-      logLevel: ctx.args.logLevel as 'silent' | 'info' | 'verbose',
-      clear: !!ctx.args.clear,
-      dotenv: { cwd, fileName: ctx.args.dotenv },
-      envName: ctx.args.envName,
-      port: process.env._PORT ?? undefined,
-      devContext,
-    })
-
-    nuxtDev.on('loading:error', (_error) => {
-      sendIPCMessage({ type: 'nuxt:internal:dev:loading:error', error: {
-        message: _error.message,
-        stack: _error.stack,
-        name: _error.name,
-        code: _error.code,
-      } })
-    })
-    nuxtDev.on('loading', (message) => {
-      sendIPCMessage({ type: 'nuxt:internal:dev:loading', message })
-    })
-    nuxtDev.on('restart', () => {
-      sendIPCMessage({ type: 'nuxt:internal:dev:restart' })
-    })
-    nuxtDev.on('ready', (payload) => {
-      sendIPCMessage({ type: 'nuxt:internal:dev:ready', port: payload.port })
-    })
-
-    // Init server
-    await nuxtDev.init()
+    const { initialize } = await import('../dev')
+    await initialize({ cwd, args: ctx.args }, ctx)
   },
 })