Angular2之aot编译及Rollup优化

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最近开发的一款移动应用用了Angular2框架,直接ng build的话动不动程序就要好几M,于是采取Angular2的aot编译及Rollup优化压缩程序。

过程遇坑无数,说多了都是泪,现在问题解决了就小结下与大家分享:

  • 新建一个项目
ng new myapp
  • 复制src/tsconfig.json到根目录下,重命名为tsconfig-aot.json并编辑:
{  "compilerOptions": {    "target": "es5",    "module": "es2015",    "moduleResolution": "node",    "sourceMap": true,    "emitDecoratorMetadata": true,    "experimentalDecorators": true,    "lib": ["es2015", "dom"],    "noImplicitAny": true,    "suppressImplicitAnyIndexErrors": true,    "typeRoots": [      "node_modules/@types/"    ]  },  "files": [    "src/app/app.module.ts",    "src/main-aot.ts"  ],  "angularCompilerOptions": {    "genDir": "aot",    "skipMetadataEmit" : true  }}
  • 复制src/main.ts文件重命名为main-aot.ts,把它改为AOT编译:
import { platformBrowser }    from '@angular/platform-browser';import { AppModuleNgFactory } from '../aot/src/app/app.module.ngfactory';platformBrowser().bootstrapModuleFactory(AppModuleNgFactory);
  • 接下来安装少量新的npm依赖(有时报错可分开安装):
npm install @angular/compiler-cli @angular/platform-server --save
  • Rollup 工具安装
npm install rollup rollup-plugin-node-resolve rollup-plugin-commonjs rollup-plugin-uglify --save-dev
  • 接下来,在项目根目录新建一个配置文件rollup-config.js,来告诉Rollup如何处理应用。
import nodeResolve from 'rollup-plugin-node-resolve';import commonjs    from 'rollup-plugin-commonjs';import uglify      from 'rollup-plugin-uglify';export default {  entry: 'src/main.js',  dest: 'src/build.js', // output a single application bundle  sourceMap: false,  format: 'iife',  onwarn: function(warning) {    // Skip certain warnings    // should intercept ... but doesn't in some rollup versions    if ( warning.code === 'THIS_IS_UNDEFINED' ) { return; }    // console.warn everything else    console.warn( warning.message );  },  plugins: [      nodeResolve({jsnext: true, module: true}),      commonjs({        include: 'node_modules/rxjs/**',      }),      uglify()  ]};
  • 更便利的脚本,在package.json中添加:
"build:aot": "ngc -p tsconfig-aot.json && rollup -c rollup-config.js","serve:aot": "lite-server -c bs-config.aot.json",
  • 打开终端尝试下(顺利的话会在aot文件下生成dist/build.js):
npm run build:aot
  • 然后重点来了,在根目录下创建copy-dist-files.js文件:
var fs = require('fs');var resources = [  'node_modules/core-js/client/shim.min.js',  'node_modules/zone.js/dist/zone.min.js',  'src/styles.css'];resources.map(function(f) {  var path = f.split('/');  var t = 'aot/' + path[path.length-1];  fs.createReadStream(f).pipe(fs.createWriteStream(t));});

终端运行:

node copy-dist-files

会得到项目所需的3文件,之前就是一直欠缺里面的两个js文件导致一直出错(当然手动引入也是可以的)!

  • 最后在aot目录下补上index.html整个项目就算优化完成了,只需保留几个引入的文件即可,赶紧在服务器下试一试吧~
<!DOCTYPE html><html>  <head>    <base href="/">    <title>myAPP</title>    <meta name="viewport" content="width=device-width, initial-scale=1">    <link rel="stylesheet" href="styles.css">    <script src="shim.min.js"></script>    <script src="zone.min.js"></script>  </head>  <body>    <my-app>Loading...</my-app>  </body>  <script src="dist/build.js"></script></html>
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