feat: improve dev experience (#89)

packages/cli/build.config.ts

@@ -7,6 +7,6 @@ export default <BuildConfig>{
     'src/index'
   ],
   externals: [
-    'nuxt3'
+    '@nuxt/kit'
   ]
 }

packages/cli/package.json

@@ -17,9 +17,17 @@
     "dist"
   ],
   "devDependencies": {
+    "@nuxt/kit": "^0.4.0",
+    "@types/clear": "^0",
+    "@types/debounce-promise": "^3",
     "@types/mri": "^1.1.0",
+    "chokidar": "^3.5.1",
+    "clear": "^0.1.0",
     "colorette": "^1.2.2",
-    "listhen": "^0.2.3",
+    "debounce-promise": "^3.1.2",
+    "deep-object-diff": "^1.1.0",
+    "flat": "^5.0.2",
+    "listhen": "^0.2.4",
     "mri": "^1.1.6",
     "unbuild": "^0.1.12",
     "v8-compile-cache": "^2.3.0"

packages/cli/src/commands/build.ts

@@ -1,11 +1,13 @@
-import { buildNuxt, loadNuxt } from '../utils/nuxt'
+
+import { resolve } from 'path'
+import { requireModule } from '../utils/cjs'
 
 export async function invoke (args) {
-  const nuxt = await loadNuxt({
-    rootDir: args._[0],
-    for: 'build'
-  })
+  const rootDir = resolve(args._[0] || '.')
 
+  const { loadNuxt, buildNuxt } = requireModule('@nuxt/kit', rootDir)
+
+  const nuxt = await loadNuxt({ rootDir })
   await buildNuxt(nuxt)
 }
 

packages/cli/src/commands/dev.ts

@@ -1,20 +1,73 @@
-import { createServer } from '../utils/server'
-import { buildNuxt, loadNuxt } from '../utils/nuxt'
+import { resolve } from 'path'
+import chokidar from 'chokidar'
+import debounce from 'debounce-promise'
+import { createServer, createLoadingHandler } from '../utils/server'
+import { showBanner } from '../utils/banner'
+import { requireModule } from '../utils/cjs'
+import { error, info } from '../utils/log'
+import { diff, printDiff } from '../utils/diff'
 
 export async function invoke (args) {
   const server = createServer()
-  const listenPromise = server.listen({ clipboard: true })
+  const listener = await server.listen({ clipboard: true, open: true })
 
-  const nuxt = await loadNuxt({
-    rootDir: args._[0],
-    for: 'dev'
+  const rootDir = resolve(args._[0] || '.')
+
+  const { loadNuxt, buildNuxt } = requireModule('@nuxt/kit', rootDir)
+
+  const watcherFiles = new Set()
+  const watcher = chokidar.watch([rootDir], { ignoreInitial: true, depth: 0 })
+
+  let currentNuxt
+  const load = async () => {
+    try {
+      const newNuxt = await loadNuxt({ rootDir, dev: true, ready: false })
+      watcherFiles.add(newNuxt.options.watch)
+
+      let configChanges
+      if (currentNuxt) {
+        configChanges = diff(currentNuxt.options, newNuxt.options, [
+          'generate.staticAssets.version',
+          'env.NITRO_PRESET'
+        ])
+        server.setApp(createLoadingHandler('Restarting...', 1))
+        await currentNuxt.close()
+        currentNuxt = newNuxt
+      } else {
+        currentNuxt = newNuxt
+      }
+
+      showBanner(true)
+      listener.showURL()
+
+      if (configChanges) {
+        if (configChanges.length) {
+          info('Nuxt config updated:')
+          printDiff(configChanges)
+        } else {
+          info('Restarted nuxt due to config changes')
+        }
+      }
+
+      await currentNuxt.ready()
+      await buildNuxt(currentNuxt)
+      server.setApp(currentNuxt.server.app)
+    } catch (err) {
+      error('Cannot load nuxt.', err)
+      server.setApp(createLoadingHandler(
+        'Error while loading nuxt. Please check console and fix errors.'
+      ))
+    }
+  }
+
+  const dLoad = debounce(load, 250)
+  watcher.on('all', (_event, file) => {
+    if (watcherFiles.has(file) || file.includes('nuxt.config')) {
+      dLoad()
+    }
   })
 
-  server.setApp(nuxt.server.app)
-
-  await buildNuxt(nuxt)
-
-  await listenPromise
+  await load()
 }
 
 export const meta = {

packages/cli/src/index.ts

@@ -1,9 +1,10 @@
 import 'v8-compile-cache'
 import mri from 'mri'
-import { red, cyan, green } from 'colorette'
-import { version } from '../package.json'
+import { red, cyan } from 'colorette'
 import { commands } from './commands'
 import { showHelp } from './utils/help'
+import { showBanner } from './utils/banner'
+import { error } from './utils/log'
 
 async function _main () {
   const _argv = process.argv.slice(2)
@@ -11,7 +12,7 @@ async function _main () {
   // @ts-ignore
   let command = args._.shift() || 'usage'
 
-  console.log(green(`Nuxt CLI v${version}`))
+  showBanner(command === 'dev')
 
   if (!(command in commands)) {
     console.log('\n' + red('Invalid command ' + command))
@@ -36,10 +37,13 @@ async function _main () {
 }
 
 function onFatalError (err) {
-  console.error(err)
+  error(err)
   process.exit(1)
 }
 
+process.on('unhandledRejection', err => error('[unhandledRejection]', err))
+process.on('uncaughtException', err => error('[uncaughtException]', err))
+
 export function main () {
   _main().catch(onFatalError)
 }

packages/cli/src/utils/banner.ts

@@ -0,0 +1,8 @@
+import clear from 'clear'
+import { green } from 'colorette'
+import { version } from '../../package.json'
+
+export function showBanner (_clear: boolean) {
+  if (_clear) { clear() }
+  console.log(green(`Nuxt CLI v${version}`))
+}

packages/cli/src/utils/cjs.ts

@@ -0,0 +1,16 @@
+export function resolveModule (id, paths?) {
+  return require.resolve(id, {
+    paths: [].concat(
+      // @ts-ignore
+      global.__NUXT_PREPATHS__,
+      paths,
+      process.cwd(),
+      // @ts-ignore
+      global.__NUXT_PATHS__
+    ).filter(Boolean)
+  })
+}
+
+export function requireModule (id, paths?) {
+  return require(resolveModule(id, paths))
+}

packages/cli/src/utils/diff.ts

@@ -0,0 +1,31 @@
+import flatten from 'flat'
+import { detailedDiff } from 'deep-object-diff'
+import { green, red, blue, cyan } from 'colorette'
+
+function normalizeDiff (diffObj, type, ignore) {
+  return Object.entries(flatten(diffObj))
+    .map(([key, value]) => ({ key, value, type }))
+    .filter(item => !ignore.includes(item.key) && typeof item.value !== 'function')
+}
+
+export function diff (a, b, ignore) {
+  const _diff: any = detailedDiff(a, b)
+  return [].concat(
+    normalizeDiff(_diff.added, 'added', ignore),
+    normalizeDiff(_diff.deleted, 'deleted', ignore),
+    normalizeDiff(_diff.updated, 'updated', ignore)
+  )
+}
+
+const typeMap = {
+  added: green('added'),
+  deleted: red('deleted'),
+  updated: blue('updated')
+}
+
+export function printDiff (diff) {
+  for (const item of diff) {
+    console.log('  ', typeMap[item.type] || item.type, cyan(item.key), item.value ? `~> ${cyan(item.value)}` : '')
+  }
+  console.log()
+}

packages/cli/src/utils/log.ts

@@ -0,0 +1,5 @@
+import { red, yellow, cyan } from 'colorette'
+
+export const error = (...args) => console.error(red('[error]'), ...args)
+export const warn = (...args) => console.warn(yellow('[warn]'), ...args)
+export const info = (...args) => console.info(cyan('[info]'), ...args)

packages/cli/src/utils/nuxt.ts

@@ -1,13 +0,0 @@
-export function getNuxtPkg () {
-  return Promise.resolve(require('nuxt3'))
-}
-
-export async function loadNuxt (opts) {
-  const { loadNuxt } = await getNuxtPkg()
-  return loadNuxt(opts)
-}
-
-export async function buildNuxt (nuxt) {
-  const { build } = await getNuxtPkg()
-  return build(nuxt)
-}

packages/cli/src/utils/server.ts

@@ -1,10 +1,7 @@
 import type { RequestListener } from 'http'
 
 export function createServer () {
-  const listener = createDynamicFunction <RequestListener>((_req, res) => {
-    res.setHeader('Content-Type', 'text/html; charset=UTF-8')
-    res.end('<!DOCTYPE html><html><head><meta http-equiv="refresh" content="1"><head><body>...')
-  })
+  const listener = createDynamicFunction(createLoadingHandler('Loading...', 1))
 
   async function listen (opts) {
     const { listen } = await import('listhen')
@@ -17,6 +14,15 @@ export function createServer () {
   }
 }
 
+export function createLoadingHandler (message: string, retryAfter = 60): RequestListener {
+  return (_req, res) => {
+    res.setHeader('Content-Type', 'text/html; charset=UTF-8')
+    res.statusCode = 503 /* Service Unavailable */
+    res.setHeader('Retry-After', retryAfter)
+    res.end(`<!DOCTYPE html><html><head><meta http-equiv="refresh" content="${retryAfter || 60}"><head><body>${message}`)
+  }
+}
+
 function createDynamicFunction<T extends (...args) => any>(initialValue: T) {
   let fn: T = initialValue
   return {

packages/kit/build.config.ts

@@ -13,5 +13,9 @@ export default <BuildConfig>{
     },
     'src/index'
   ],
-  externals: ['webpack']
+  externals: [
+    'webpack',
+    'nuxt',
+    'nuxt3'
+  ]
 }

packages/kit/src/config/load.ts

@@ -1,4 +1,5 @@
 import { resolve } from 'path'
+import { existsSync } from 'fs'
 import defu from 'defu'
 import { applyDefaults } from 'untyped'
 import * as rc from 'rc9'
@@ -22,7 +23,7 @@ export function loadNuxtConfig (opts: LoadNuxtConfigOptions): NuxtOptions {
 
   let nuxtConfig: any = {}
 
-  if (nuxtConfigFile) {
+  if (nuxtConfigFile && existsSync(nuxtConfigFile)) {
     nuxtConfig = requireModule(nuxtConfigFile, { clearCache: true })
     nuxtConfig = { ...nuxtConfig }
     nuxtConfig._nuxtConfigFile = nuxtConfigFile

packages/kit/src/config/schema/_common.ts

@@ -500,7 +500,12 @@ export default {
    * ```
    */
   watch: {
-    $resolve: (val, get) => [].concat(val, get('_nuxtConfigFiles')).filter(Boolean)
+    $resolve: (val, get) => {
+      const rootDir = get('rootDir')
+      return Array.from(new Set([].concat(val, get('_nuxtConfigFiles'))
+        .filter(Boolean).map(p => resolve(rootDir, p))
+      ))
+    }
   },
 
   /**

packages/kit/src/nuxt.ts

@@ -1,9 +1,12 @@
 import { getContext } from 'unctx'
 import type { Nuxt } from './types/nuxt'
 import type { NuxtConfig } from './types/config'
+import type { LoadNuxtConfigOptions } from './config/load'
+import { requireModule } from './utils/cjs'
 
 /** Direct access to the Nuxt context - see https://github.com/unjs/unctx. */
 export const nuxtCtx = getContext<Nuxt>('nuxt')
+
 /**
  * Get access to Nuxt (if run within the Nuxt context) - see https://github.com/unjs/unctx.
  *
@@ -27,3 +30,45 @@ export const useNuxt = nuxtCtx.use
 export function defineNuxtConfig (config: NuxtConfig) {
   return config
 }
+
+export interface LoadNuxtOptions extends LoadNuxtConfigOptions {
+  rootDir: string
+  dev?: boolean
+  config?: NuxtConfig
+  version?: 2 | 3
+  configFile?: string
+  ready?: boolean
+}
+
+export async function loadNuxt (opts: LoadNuxtOptions): Promise<Nuxt> {
+  // Nuxt 3
+  if (opts.version !== 2) {
+    const { loadNuxt } = requireModule('nuxt3', { paths: opts.rootDir })
+    const nuxt = await loadNuxt(opts)
+    return nuxt
+  }
+
+  // Compat
+  // @ts-ignore
+  const { loadNuxt } = requireModule('nuxt', { paths: opts.rootDir })
+  const nuxt = await loadNuxt({
+    rootDir: opts.rootDir,
+    for: opts.dev ? 'dev' : 'build',
+    configOverrides: opts.config,
+    ready: opts.ready
+  })
+  return nuxt as Nuxt
+}
+
+export function buildNuxt (nuxt: Nuxt): Promise<any> {
+  // Nuxt 3
+  if (nuxt.options._majorVersion === 3) {
+    const { build } = requireModule('nuxt3', { paths: nuxt.options.rootDir })
+    return build(nuxt)
+  }
+
+  // Compat
+  // @ts-ignore
+  const { build } = requireModule('nuxt', { paths: nuxt.options.rootDir })
+  return build(nuxt)
+}

packages/kit/src/types/nuxt.ts

@@ -16,6 +16,9 @@ export interface Nuxt {
   hook: Nuxt['hooks']['hook']
   callHook: Nuxt['hooks']['callHook']
 
+  ready: () => Promise<void>
+  close: () => Promise<void>
+
   /** The production or development server */
   server?: any
 }

packages/kit/src/utils/cjs.ts

@@ -5,7 +5,7 @@ import jiti from 'jiti'
 const _require = jiti(process.cwd())
 
 export interface ResolveModuleOptions {
-  paths?: string[]
+  paths?: string | string[]
 }
 
 export interface RequireModuleOptions extends ResolveModuleOptions {
@@ -82,7 +82,14 @@ export function requireModulePkg (id: string, opts: RequireModuleOptions = {}) {
 /** Resolve the path of a module. */
 export function resolveModule (id: string, opts: ResolveModuleOptions = {}) {
   return _require.resolve(id, {
-    paths: opts.paths
+    paths: [].concat(
+      // @ts-ignore
+      global.__NUXT_PREPATHS__,
+      opts.paths,
+      process.cwd(),
+      // @ts-ignore
+      global.__NUXT_PATHS__
+    ).filter(Boolean)
   })
 }
 

packages/nuxt3/src/builder.ts

@@ -43,7 +43,9 @@ export class Builder {
 async function _build (builder: Builder) {
   const { nuxt } = builder
 
-  await fsExtra.emptyDir(nuxt.options.buildDir)
+  if (!nuxt.options.dev) {
+    await fsExtra.emptyDir(nuxt.options.buildDir)
+  }
   await generate(builder)
 
   if (nuxt.options.dev) {

packages/nuxt3/src/nuxt.ts

@@ -1,16 +1,20 @@
 import Hookable from 'hookable'
-import { loadNuxtConfig, LoadNuxtConfigOptions, Nuxt, NuxtOptions, installModule, NuxtConfig } from '@nuxt/kit'
+import { loadNuxtConfig, LoadNuxtOptions, Nuxt, NuxtOptions, installModule, ModuleContainer } from '@nuxt/kit'
 import { initNitro } from './nitro'
 
 export function createNuxt (options: NuxtOptions): Nuxt {
   const hooks = new Hookable() as any as Nuxt['hooks']
 
-  return {
+  const nuxt: Nuxt = {
     options,
     hooks,
     callHook: hooks.callHook,
-    hook: hooks.hook
+    hook: hooks.hook,
+    ready: () => initNuxt(nuxt),
+    close: () => Promise.resolve(hooks.callHook('close', nuxt))
   }
+
+  return nuxt
 }
 
 async function initNuxt (nuxt: Nuxt) {
@@ -21,7 +25,7 @@ async function initNuxt (nuxt: Nuxt) {
   await initNitro(nuxt)
 
   // Init user modules
-  await nuxt.callHook('modules:before', nuxt)
+  await nuxt.callHook('modules:before', { nuxt } as ModuleContainer)
   const modulesToInstall = [
     ...nuxt.options.buildModules,
     ...nuxt.options.modules,
@@ -32,25 +36,13 @@ async function initNuxt (nuxt: Nuxt) {
     await installModule(nuxt, m)
   }
 
-  await nuxt.callHook('modules:done', nuxt)
+  await nuxt.callHook('modules:done', { nuxt } as ModuleContainer)
 
   await nuxt.callHook('ready', nuxt)
 }
 
-export interface LoadNuxtOptions extends LoadNuxtConfigOptions {
-  for?: 'dev' | 'build'
-  rootDir?: string
-  config?: NuxtConfig
-}
-
-export async function loadNuxt (loadOpts: LoadNuxtOptions = {}): Promise<Nuxt> {
-  const options = loadNuxtConfig({
-    config: {
-      dev: loadOpts.for === 'dev',
-      ...loadOpts.config
-    },
-    ...loadOpts
-  })
+export async function loadNuxt (opts: LoadNuxtOptions): Promise<Nuxt> {
+  const options = loadNuxtConfig(opts)
 
   // Temp
   const { appDir } = await import('@nuxt/app/meta')
@@ -60,7 +52,9 @@ export async function loadNuxt (loadOpts: LoadNuxtOptions = {}): Promise<Nuxt> {
 
   const nuxt = createNuxt(options)
 
-  await initNuxt(nuxt)
+  if (opts.ready !== false) {
+    await nuxt.ready()
+  }
 
   return nuxt
 }

packages/vite/src/vite.ts

@@ -104,7 +104,12 @@ async function buildServer (ctx: ViteBuildContext) {
       outDir: 'dist/server',
       ssr: true,
       rollupOptions: {
-        input: resolve(ctx.nuxt.options.buildDir, './entry.server.js')
+        input: resolve(ctx.nuxt.options.buildDir, './entry.server.js'),
+        onwarn (warning, rollupWarn) {
+          if (!['UNUSED_EXTERNAL_IMPORT'].includes(warning.code)) {
+            rollupWarn(warning)
+          }
+        }
       }
     }
   } as vite.InlineConfig)

yarn.lock

@@ -2158,6 +2158,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/clear@npm:^0":
+  version: 0.1.1
+  resolution: "@types/clear@npm:0.1.1"
+  checksum: ded7ef18386cb110b1293e91640b11a03c1006a9c2c04336fad39b55a7bfff8f700468748432a3e6614cbeaaed8efc0d4608d003372784128129c230ac061cf3
+  languageName: node
+  linkType: hard
+
 "@types/connect@npm:*":
   version: 3.4.34
   resolution: "@types/connect@npm:3.4.34"
@@ -2167,6 +2174,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/debounce-promise@npm:^3":
+  version: 3.1.3
+  resolution: "@types/debounce-promise@npm:3.1.3"
+  checksum: cdd735adf58d7c724cf3be35e799a657e0b9e71690fc2c64c660de1f8ba0f57fde3244ca515ae9c448ea47c293eef5b414e7f8aa1b2d782b78db8af0ca811ee6
+  languageName: node
+  linkType: hard
+
 "@types/debounce@npm:^1.2.0":
   version: 1.2.0
   resolution: "@types/debounce@npm:1.2.0"
@@ -4188,6 +4202,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"clear@npm:^0.1.0":
+  version: 0.1.0
+  resolution: "clear@npm:0.1.0"
+  checksum: 5bb327928ac437961b25b51c8ab637b9c6dd74e53ff1d76928c71900f27ef8774da778da81b6cc7d9aba3467da508be9bbd4968a347ba6467761643111d34948
+  languageName: node
+  linkType: hard
+
 "cli-cursor@npm:^3.1.0":
   version: 3.1.0
   resolution: "cli-cursor@npm:3.1.0"
@@ -4968,6 +4989,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"debounce-promise@npm:^3.1.2":
+  version: 3.1.2
+  resolution: "debounce-promise@npm:3.1.2"
+  checksum: 7ae406b3daf581a9cb541d10400c2843057da57506737a36ca9b2e303b5515b0f786d392c678ef1fcfead4a2cf6075dbb16d9897166692cb3956a2ad835be5a4
+  languageName: node
+  linkType: hard
+
 "debounce@npm:^1.2.1":
   version: 1.2.1
   resolution: "debounce@npm:1.2.1"
@@ -5064,6 +5092,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"deep-object-diff@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "deep-object-diff@npm:1.1.0"
+  checksum: 2667c43932d14c908d03f813cd2846a626bda1d320f8f1dee3c7bd00ff8058713bb8f5d995fabd617e09229cf64bf16e53579233e29da870fd27bde23d5f5b20
+  languageName: node
+  linkType: hard
+
 "deepmerge@npm:^4.2.2":
   version: 4.2.2
   resolution: "deepmerge@npm:4.2.2"
@@ -6332,7 +6367,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"flat@npm:^5.0.0":
+"flat@npm:^5.0.0, flat@npm:^5.0.2":
   version: 5.0.2
   resolution: "flat@npm:5.0.2"
   bin:
@@ -8749,6 +8784,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"listhen@npm:^0.2.4":
+  version: 0.2.4
+  resolution: "listhen@npm:0.2.4"
+  dependencies:
+    clipboardy: ^2.3.0
+    colorette: ^1.2.2
+    get-port-please: ^2.1.0
+    http-shutdown: ^1.2.2
+    open: ^8.0.5
+    selfsigned: ^1.10.8
+  checksum: e297ecd7215f907b26ffbd5df03fbb25d92ef01a5d3f92e1134d0c599d76f98ab150453103c05800f23564df56d3aa7097dd01d3b6383990089f4c46bc51d754
+  languageName: node
+  linkType: hard
+
 "load-json-file@npm:^1.0.0":
   version: 1.1.0
   resolution: "load-json-file@npm:1.1.0"
@@ -9996,9 +10045,17 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "nuxt-cli@workspace:packages/cli"
   dependencies:
+    "@nuxt/kit": ^0.4.0
+    "@types/clear": ^0
+    "@types/debounce-promise": ^3
     "@types/mri": ^1.1.0
+    chokidar: ^3.5.1
+    clear: ^0.1.0
     colorette: ^1.2.2
-    listhen: ^0.2.3
+    debounce-promise: ^3.1.2
+    deep-object-diff: ^1.1.0
+    flat: ^5.0.2
+    listhen: ^0.2.4
     mri: ^1.1.6
     unbuild: ^0.1.12
     v8-compile-cache: ^2.3.0