feat(build): auto generate vendor chunk

Add `--vendor-chunk` option to `ng build/serve`.

Enabling vendor chunk can help with rebuild speeds. My tests on a medium project show a 34% improvement on rebuild.

This option is enabled by default on `ng serve` and `ng build`. To disable
it, use `--no-vendor-chunk` flag.

Partially address #1980

BREAKING CHANGE: `ng build/serve` now generated `vendor.bundle.js` by
default.

Author: filipesilva

packages/angular-cli/commands/build.ts

@@ -12,6 +12,7 @@ export interface BuildOptions {
   baseHref?: string;
   aot?: boolean;
   sourcemap?: boolean;
+  vendorChunk?: boolean;
 }
 
 const BuildCommand = Command.extend({
@@ -33,7 +34,8 @@ const BuildCommand = Command.extend({
     { name: 'suppress-sizes', type: Boolean, default: false },
     { name: 'base-href',      type: String,  default: null, aliases: ['bh'] },
     { name: 'aot',            type: Boolean, default: false },
-    { name: 'sourcemap',      type: Boolean, default: true, aliases: ['sm'] }
+    { name: 'sourcemap',      type: Boolean, default: true, aliases: ['sm'] },
+    { name: 'vendor-chunk',   type: Boolean, default: true }
   ],
 
   run: function (commandOptions: BuildOptions) {

packages/angular-cli/commands/serve.ts

@@ -28,6 +28,7 @@ export interface ServeTaskOptions {
   aot?: boolean;
   sourcemap?: boolean;
   open?: boolean;
+  vendorChunk?: boolean;
 }
 
 const ServeCommand = Command.extend({
@@ -83,6 +84,7 @@ const ServeCommand = Command.extend({
     { name: 'ssl-cert',             type: String,  default: 'ssl/server.crt' },
     { name: 'aot',                  type: Boolean, default: false },
     { name: 'sourcemap',            type: Boolean, default: true, aliases: ['sm'] },
+    { name: 'vendor-chunk',         type: Boolean, default: true },
     {
       name: 'open',
       type: Boolean,

packages/angular-cli/models/webpack-build-common.ts

@@ -1,6 +1,7 @@
 import * as webpack from 'webpack';
 import * as path from 'path';
 import {GlobCopyWebpackPlugin} from '../plugins/glob-copy-webpack-plugin';
+import {packageChunkSort} from '../utilities/package-chunk-sort';
 import {BaseHrefWebpackPlugin} from '@angular-cli/base-href-webpack';
 
 const HtmlWebpackPlugin = require('html-webpack-plugin');
@@ -12,7 +13,8 @@ export function getWebpackCommonConfig(
   environment: string,
   appConfig: any,
   baseHref: string,
-  sourcemap: boolean
+  sourcemap: boolean,
+  vendorChunk: boolean
 ) {
 
   const appRoot = path.resolve(projectRoot, appConfig.root);
@@ -23,6 +25,7 @@ export function getWebpackCommonConfig(
   const scripts = appConfig.scripts
                 ? appConfig.scripts.map((script: string) => path.resolve(appRoot, script))
                 : [];
+  const extraPlugins: any[] = [];
 
   let entry: { [key: string]: string[] } = {
     main: [appMain]
@@ -32,6 +35,14 @@ export function getWebpackCommonConfig(
   if (appConfig.styles.length > 0) { entry['styles'] = styles; }
   if (appConfig.scripts.length > 0) { entry['scripts'] = scripts; }
 
+  if (vendorChunk) {
+    extraPlugins.push(new webpack.optimize.CommonsChunkPlugin({
+      name: 'vendor',
+      chunks: ['main'],
+      minChunks: (module: any) => module.userRequest && !module.userRequest.includes(appRoot)
+    }));
+  }
+
   return {
     devtool: sourcemap ? 'source-map' : 'eval',
     resolve: {
@@ -91,7 +102,7 @@ export function getWebpackCommonConfig(
       new HtmlWebpackPlugin({
         template: path.resolve(appRoot, appConfig.index),
         filename: path.resolve(appConfig.outDir, appConfig.index),
-        chunksSortMode: 'dependency'
+        chunksSortMode: packageChunkSort(['inline', 'styles', 'scripts', 'vendor', 'main'])
       }),
       new BaseHrefWebpackPlugin({
         baseHref: baseHref
@@ -104,10 +115,6 @@ export function getWebpackCommonConfig(
           .replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&')),
         path.resolve(appRoot, appConfig.environments[environment])
       ),
-      new webpack.optimize.CommonsChunkPlugin({
-        // Optimizing ensures loading order in index.html
-        name: ['styles', 'scripts', 'main'].reverse()
-      }),
       new webpack.optimize.CommonsChunkPlugin({
         minChunks: Infinity,
         name: 'inline'
@@ -121,8 +128,8 @@ export function getWebpackCommonConfig(
         options: {
           postcss: [ autoprefixer() ]
         },
-      }),
-    ],
+      })
+    ].concat(extraPlugins),
     node: {
       fs: 'empty',
       global: true,

packages/angular-cli/models/webpack-config.ts

@@ -25,6 +25,7 @@ export class NgCliWebpackConfig {
     baseHref?: string,
     isAoT = false,
     sourcemap = true,
+    vendorChunk = false,
   ) {
     const config: CliConfig = CliConfig.fromProject();
     const appConfig = config.config.apps[0];
@@ -36,7 +37,8 @@ export class NgCliWebpackConfig {
       environment,
       appConfig,
       baseHref,
-      sourcemap
+      sourcemap,
+      vendorChunk
     );
     let targetConfigPartial = this.getTargetConfig(this.ngCliProject.root, appConfig);
     const typescriptConfigPartial = isAoT

packages/angular-cli/tasks/build-webpack-watch.ts

@@ -25,7 +25,8 @@ export default Task.extend({
       outputDir,
       runTaskOptions.baseHref,
       runTaskOptions.aot,
-      runTaskOptions.sourcemap
+      runTaskOptions.sourcemap,
+      runTaskOptions.vendorChunk
     ).config;
     const webpackCompiler: any = webpack(config);
 

packages/angular-cli/tasks/build-webpack.ts

@@ -24,7 +24,8 @@ export default <any>Task.extend({
       outputDir,
       runTaskOptions.baseHref,
       runTaskOptions.aot,
-      runTaskOptions.sourcemap
+      runTaskOptions.sourcemap,
+      runTaskOptions.vendorChunk
     ).config;
 
     const webpackCompiler: any = webpack(config);

packages/angular-cli/tasks/serve-webpack.ts

@@ -27,7 +27,8 @@ export default Task.extend({
       undefined,
       undefined,
       commandOptions.aot,
-      commandOptions.sourcemap
+      commandOptions.sourcemap,
+      commandOptions.vendorChunk
     ).config;
 
     // This allows for live reload of page when changes are made to repo.

packages/angular-cli/utilities/package-chunk-sort.ts

@@ -0,0 +1,17 @@
+export function packageChunkSort(packages: string[]) {
+  return function sort(left: any, right: any) {
+    let leftIndex = packages.indexOf(left.names[0]);
+    let rightindex = packages.indexOf(right.names[0]);
+
+    if ( leftIndex < 0 || rightindex < 0) {
+      // Unknown packages are loaded last
+      return 1;
+    }
+
+    if (leftIndex > rightindex) {
+      return 1;
+    }
+
+    return -1;
+  };
+}

tests/e2e/tests/build/vendor-chunk.ts

@@ -0,0 +1,11 @@
+import {ng} from '../../utils/process';
+import {expectFileToExist} from '../../utils/fs';
+import {expectToFail} from '../../utils/utils';
+
+
+export default function() {
+  return ng('build')
+    .then(() => expectFileToExist('dist/vendor.bundle.js'))
+    .then(() => ng('build', '--no-vendor-chunk'))
+    .then(() => expectToFail(() => expectFileToExist('dist/vendor.bundle.js')));
+}