feat: experimental dll support

`.cache/` should be git ignored in projects.
disabled by default. Can be enabled using `options.build.dll: true`

lib/builder/builder.js

@@ -10,11 +10,12 @@ import Tapable from 'tappable'
 import MFS from 'memory-fs'
 import webpackDevMiddleware from 'webpack-dev-middleware'
 import webpackHotMiddleware from 'webpack-hot-middleware'
-import { r, wp, wChunk, createRoutes, parallel, relativeTo, isPureObject } from 'utils'
+import { r, wp, wChunk, createRoutes, sequence, relativeTo, isPureObject } from 'utils'
 import Debug from 'debug'
 import Glob from 'glob'
 import clientWebpackConfig from './webpack/client.config.js'
 import serverWebpackConfig from './webpack/server.config.js'
+import dllWebpackConfig from './webpack/dll.config.js'
 import vueLoaderConfig from './webpack/vue-loader.config'
 import styleLoader from './webpack/style-loader'
 
@@ -66,6 +67,29 @@ export default class Builder extends Tapable {
     })
   }
 
+  vendor () {
+    return [
+      'vue',
+      'vue-router',
+      'vue-meta',
+      'core-js',
+      'regenerator-runtime',
+      'es6-promise',
+      'babel-runtime',
+      'vuex'
+    ].concat(this.options.build.vendor).filter(v => v)
+  }
+
+  vendorEntries () {
+    // Used for dll
+    const vendor = this.vendor()
+    const vendorEntries = {}
+    vendor.forEach(v => {
+      vendorEntries[v] = [ v ]
+    })
+    return vendorEntries
+  }
+
   forGenerate () {
     this.isStatic = true
   }
@@ -361,6 +385,11 @@ export default class Builder extends Tapable {
       }
     })
 
+    // Make a dll plugin after compile to make next dev builds faster
+    if (this.options.build.dll && this.options.dev) {
+      compilersOptions.push(dllWebpackConfig.call(this, clientConfig))
+    }
+
     // Simulate webpack multi compiler interface
     // Separate compilers are simpler, safer and faster
     this.compiler = { compilers: [] }
@@ -377,7 +406,7 @@ export default class Builder extends Tapable {
     // Initialize compilers
     compilersOptions.forEach(compilersOption => {
       const compiler = webpack(compilersOption)
-      if (sharedFS) {
+      if (sharedFS && !compiler.name.includes('-dll')) {
         compiler.outputFileSystem = sharedFS
       }
       compiler.cache = sharedCache
@@ -398,6 +427,9 @@ export default class Builder extends Tapable {
       if (stats.hasErrors()) {
         return
       }
+
+      // console.log(stats.toString({ chunks: true }))
+
       // Reload renderer if available
       if (this.nuxt.renderer) {
         this.nuxt.renderer.loadResources(sharedFS || fs)
@@ -414,12 +446,21 @@ export default class Builder extends Tapable {
     await this.applyPluginsAsync('compile', { builder: this, compiler: this.compiler })
 
     // Start Builds
-    await parallel(this.compiler.compilers, compiler => new Promise((resolve, reject) => {
+    await sequence(this.compiler.compilers, compiler => new Promise((resolve, reject) => {
       if (this.options.dev) {
         // --- Dev Build ---
         if (compiler.options.name === 'client') {
           // Client watch is started by dev-middleware
           resolve()
+        } else if (compiler.options.name.includes('-dll')) {
+          // DLL builds should run once
+          compiler.run((err, stats) => {
+            if (err) {
+              return reject(err)
+            }
+            debug('[DLL] updated')
+            resolve()
+          })
         } else {
           // Build and watch for changes
           compiler.watch(this.options.watchers.webpack, (err) => {
@@ -440,7 +481,7 @@ export default class Builder extends Tapable {
           if (err) return console.error(err) // eslint-disable-line no-console
 
           // Show build stats for production
-          console.log(stats.toString(this.webpackStats))// eslint-disable-line no-console
+          console.log(stats.toString(this.webpackStats)) // eslint-disable-line no-console
 
           /* istanbul ignore if */
           if (stats.hasErrors()) {

lib/builder/webpack/base.config.js

@@ -12,10 +12,11 @@ import { isUrl, urlJoin } from 'utils'
 | webpack config files
 |--------------------------------------------------------------------------
 */
-export default function webpackBaseConfig ({ isClient, isServer }) {
+export default function webpackBaseConfig (name) {
   const nodeModulesDir = join(__dirname, '..', 'node_modules')
 
   const config = {
+    name,
     devtool: this.options.dev ? 'cheap-module-source-map' : 'nosources-source-map',
     entry: {
       app: null
@@ -63,7 +64,7 @@ export default function webpackBaseConfig ({ isClient, isServer }) {
         {
           test: /\.vue$/,
           loader: 'vue-loader',
-          options: this.vueLoader({ isClient, isServer })
+          options: this.vueLoader()
         },
         {
           test: /\.js$/,

lib/builder/webpack/client.config.js

@@ -7,8 +7,13 @@ import ProgressBarPlugin from 'progress-bar-webpack-plugin'
 import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer'
 import MinifyPlugin from 'babel-minify-webpack-plugin'
 import { resolve } from 'path'
+import { existsSync } from 'fs'
+import Debug from 'debug'
 import base from './base.config.js'
 
+const debug = Debug('nuxt:build')
+debug.color = 2 // Force green color
+
 /*
 |--------------------------------------------------------------------------
 | Webpack Client Config
@@ -20,29 +25,16 @@ import base from './base.config.js'
 |--------------------------------------------------------------------------
 */
 export default function webpackClientConfig () {
-  let config = base.call(this, { isClient: true })
-
-  config.name = 'client'
+  let config = base.call(this, 'client')
 
   // App entry
   config.entry.app = resolve(this.options.buildDir, 'client.js')
 
-  // Add vendors
-  // This vendors should explicitly extracted
-  // Even if not used in 50% of the chunks!
-  const vendor = [
-    'vue',
-    'vue-router',
-    'vue-meta',
-    'core-js',
-    'regenerator-runtime',
-    'es6-promise',
-    'babel-runtime',
-    'vuex'
-  ].concat(this.options.build.vendor).filter(v => v)
-
   // Extract vendor chunks for better caching
   const _this = this
+  const totalPages = _this.routes ? _this.routes.length : 0
+  const vendor = this.vendor()
+
   config.plugins.push(
     new webpack.optimize.CommonsChunkPlugin({
       name: 'common',
@@ -56,13 +48,11 @@ export default function webpackClientConfig () {
         }
 
         // Extract all explicit vendor modules
+        // Vendor should explicitly extracted even if not used in 50% of the chunks!
         if (module.context && vendor.some(v => module.context.includes(v))) {
           return true
         }
 
-        // Total pages
-        const totalPages = _this.routes ? _this.routes.length : 0
-
         // A module is extracted into the vendor chunk when...
         return (
           // If it's inside node_modules
@@ -157,6 +147,27 @@ export default function webpackClientConfig () {
       new webpack.HotModuleReplacementPlugin(),
       new webpack.NoEmitOnErrorsPlugin()
     )
+
+    // DllReferencePlugin
+    // https://github.com/webpack/webpack/tree/master/examples/dll-user
+    if (this.options.build.dll) {
+      const _dlls = []
+      const vendorEntries = this.vendorEntries()
+      const dllDir = resolve(this.options.cacheDir, config.name + '-dll')
+      Object.keys(vendorEntries).forEach(v => {
+        const dllManifestFile = resolve(dllDir, v + '-manifest.json')
+        if (existsSync(dllManifestFile)) {
+          _dlls.push(v)
+          config.plugins.push(
+            new webpack.DllReferencePlugin({
+              // context: this.options.rootDir,
+              manifest: dllManifestFile // Using full path to allow finding .js dll file
+            })
+          )
+        }
+      })
+      debug('[DLL] ' + _dlls.join(','))
+    }
   }
 
   // --------------------------------------

lib/builder/webpack/dll.config.js

@@ -0,0 +1,46 @@
+import webpack from 'webpack'
+import { resolve } from 'path'
+import ClientConfig from './client.config'
+
+/*
+|--------------------------------------------------------------------------
+| Webpack Dll Config
+| https://github.com/webpack/webpack/tree/master/examples/dll
+|--------------------------------------------------------------------------
+*/
+export default function webpackDllConfig (_refConfig) {
+  const refConfig = _refConfig || new ClientConfig()
+
+  const name = refConfig.name + '-dll'
+  const dllDir = resolve(this.options.cacheDir, name)
+
+  let config = {
+    name,
+    entry: this.vendorEntries(),
+    // context: this.options.rootDir,
+    resolve: refConfig.resolve,
+    target: refConfig.target,
+    resolveLoader: refConfig.resolveLoader,
+    module: refConfig.module,
+    plugins: []
+  }
+
+  config.output = {
+    path: dllDir,
+    filename: '[name]_[hash].js',
+    library: '[name]_[hash]'
+  }
+
+  config.plugins.push(
+    new webpack.DllPlugin({
+      // The path to the manifest file which maps between
+      // modules included in a bundle and the internal IDs
+      // within that bundle
+      path: resolve(dllDir, '[name]-manifest.json'),
+
+      name: '[name]_[hash]'
+    })
+  )
+
+  return config
+}

lib/builder/webpack/server.config.js

@@ -12,9 +12,7 @@ import base from './base.config.js'
 |--------------------------------------------------------------------------
 */
 export default function webpackServerConfig () {
-  let config = base.call(this, { isServer: true })
-
-  config.name = 'server'
+  let config = base.call(this, 'server')
 
   // env object defined in nuxt.config.js
   let env = {}

lib/builder/webpack/vue-loader.config.js

@@ -1,4 +1,4 @@
-export default function vueLoader ({ isClient }) {
+export default function vueLoader () {
   // https://vue-loader.vuejs.org/en
   const config = {
     postcss: this.options.build.postcss,

lib/common/options.js

@@ -33,7 +33,8 @@ Options.from = function (_options) {
   options.rootDir = hasValue(options.rootDir) ? options.rootDir : process.cwd()
   options.srcDir = hasValue(options.srcDir) ? resolve(options.rootDir, options.srcDir) : options.rootDir
   options.modulesDir = resolve(options.rootDir, hasValue(options.modulesDir) ? options.modulesDir : 'node_modules')
-  options.buildDir = join(options.rootDir, options.buildDir)
+  options.buildDir = resolve(options.rootDir, options.buildDir)
+  options.cacheDir = resolve(options.rootDir, options.cacheDir)
 
   // If app.html is defined, set the template path to the user template
   options.appTemplatePath = resolve(options.buildDir, 'views/app.template.html')
@@ -162,9 +163,11 @@ Options.defaults = {
   dev: process.env.NODE_ENV !== 'production',
   debug: undefined, // Will be equal to dev if not provided
   buildDir: '.nuxt',
+  cacheDir: '.cache',
   nuxtAppDir: resolve(__dirname, '../lib/app/'), // Relative to dist
   build: {
     analyze: false,
+    dll: false,
     extractCSS: false,
     cssSourceMap: undefined,
     ssr: undefined,
@@ -266,7 +269,9 @@ Options.defaults = {
     }
   },
   watchers: {
-    webpack: {},
+    webpack: {
+      ignored: /-dll/
+    },
     chokidar: {}
   }
 }