使用webpack优化Angular 2应用程序构建持续时间

Question

我构建了一个Angular 2应用程序并将其与webpack捆绑在一起.目前,我的应用程序仍然很小,但webpack任务已经需要大约10秒钟.是否可以优化我的webpack配置或TypeSript编译选项以改进编译和打包持续时间？

这是我使用的webpack配置:

var webpack = require('webpack');
var LiveReloadPlugin = require('webpack-livereload-plugin');

module.exports = {
  entry: __dirname + '/assets/app/app.ts',
  output: {
    filename: 'myApp.bundle.js',
    path: __dirname + '/build/'
  },
  // Turn on sourcemaps
  devtool: 'source-map',
  resolve: {
    extensions: ['.ts', '.js']
  },
  plugins: [
    new LiveReloadPlugin({
      appendScriptTag: true
    }),
    // Fixes angular 2 warning
    new webpack.ContextReplacementPlugin(
      /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
      __dirname
    )
  ],
  module: {
    rules: [{
        enforce: 'pre',
        test: /\.js$/,
        loader: "source-map-loader"
      },
      {
        enforce: 'pre',
        test: /\.tsx?$/,
        use: "ts-loader"
      }
    ]
  }
}

和tsconfig:

{
  "compilerOptions": {
    "target": "ES5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "pretty": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "noUnusedLocals": false,
    "removeComments": true,
    "skipLibCheck": true,
    "strictNullChecks": false,
    "baseUrl": "./src",
    "typeRoots": ["node_modules/@types"],
    "types": [
      "core-js",
      "systemjs"
    ],
    "outDir": "./build"
  },
  "exclude": [
    "node_modules"
  ]
}

更新 (请参阅我对固定webpack.config的回答)

我尝试通过在单独的构建中编译角度来构建@jpwiddy建议的DLL webpack插件,以便在开发期间仅重建应用程序代码并获得相当长的编译时间.

但是,在检查输出JS之后,文件大小完全相同,并且内部仍然存在角度代码.

这是角度源的新webpack配置文件:

var webpack = require('webpack');

module.exports = {
  entry: {
      angular:[
        '@angular/platform-browser',
        '@angular/platform-browser-dynamic',
        '@angular/core',
        '@angular/common',
        '@angular/compiler',
        '@angular/http',
        '@angular/router',
        '@angular/forms'        
    ]
  },
  output: {
    filename: 'ng2.dll.js',
    path: __dirname + '/build/',
    library: 'ng2'
  },
  plugins: [
    // Fixes angular 2 warning
    new webpack.ContextReplacementPlugin(
      /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
      __dirname
    ),
    new webpack.DllPlugin({ 
        name: 'ng2', 
        path: __dirname + '/build/ng2.json'
    })
  ]
}

并为应用程序更新了webpack配置:

var webpack = require('webpack');
var LiveReloadPlugin = require('webpack-livereload-plugin');

module.exports = {
  entry: __dirname + '/assets/app/app.ts',
  output: {
    filename: 'myApp.bundle.js',
    path: __dirname + '/build/'
  },
  // Turn on sourcemaps
  devtool: 'source-map',
  resolve: {
    extensions: ['.ts', '.js']
  },
  plugins: [
    new LiveReloadPlugin({
      appendScriptTag: true
    }),
    // Fixes angular 2 warning
    new webpack.ContextReplacementPlugin(
      /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
      __dirname
    ),
    new webpack.DllReferencePlugin({
      context: __dirname + '/build/',
      manifest: require(__dirname + '/build/ng2.json')
    })
  ],
  module: {
    rules: [{
        enforce: 'pre',
        test: /\.js$/,
        loader: "source-map-loader"
      },
      {
        enforce: 'pre',
        test: /\.tsx?$/,
        use: "ts-loader"
      }
    ]
  }
}

这是我在我的应用程序JS输出中找到的角度代码之一:

_TsEmitterVisitor.prototype.visitBuiltintType = function (type, ctx) {
    var typeStr;
    switch (type.name) {
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].Bool:
            typeStr = 'boolean';
            break;
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].Dynamic:
            typeStr = 'any';
            break;
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].Function:
            typeStr = 'Function';
            break;
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].Number:
            typeStr = 'number';
            break;
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].Int:
            typeStr = 'number';
            break;
        case __WEBPACK_IMPORTED_MODULE_2__output_ast__["R" /* BuiltinTypeName */].String:
            typeStr = 'string';
            break;
        default:
            throw new Error("Unsupported builtin type " + type.name);
    }
    ctx.print(typeStr);
    return null;
 };

我是否错过了新配置中的某些内容以防止webpack包含输出中的角度源？

谢谢

Answer 1

我设法使用全新的模块webpack-dll-bundles-plugin（在后台使用DllPlugin和DllReferencePlugin）修复我的配置，这正是我正在寻找的：在他自己的包中隔离 Angular 2 的构建，并避免重建我的每次我想重建我的应用程序代码（例如使用观察者）时，都会使用整个捆绑包。

我的重建时间从 10 秒减少到 1 秒。

这是我的新 webpack 配置：

var webpack = require('webpack');
var LiveReloadPlugin = require('webpack-livereload-plugin');
const DllBundlesPlugin = require('webpack-dll-bundles-plugin').DllBundlesPlugin;

module.exports = {
  entry: __dirname + '/assets/app/app.ts',
  output: {
    filename: 'myApp.bundle.js',
    path: __dirname + '/build/'
  },
  // Turn on sourcemaps
  devtool: 'source-map',
  resolve: {
    extensions: ['.ts', '.js']
  },
  plugins: [
    new LiveReloadPlugin({
      appendScriptTag: true
    }),
    // Fixes angular 2 warning
    new webpack.ContextReplacementPlugin(
      /angular(\\|\/)core(\\|\/)(esm(\\|\/)src|src)(\\|\/)linker/,
      __dirname
    ),
    new DllBundlesPlugin({
        bundles: {
          vendor: [
            '@angular/platform-browser',
            '@angular/platform-browser-dynamic',
            '@angular/core',
            '@angular/common',
            '@angular/forms',
            '@angular/http',
            '@angular/router',
            'rxjs',
          ]
        },
        dllDir:  __dirname + '/build/',
        webpackConfig: {}
      })
  ],
  module: {
    rules: [{
        enforce: 'pre',
        test: /\.js$/,
        loader: "source-map-loader"
      },
      {
        enforce: 'pre',
        test: /\.tsx?$/,
        use: "ts-loader"
      }
    ]
  }
}