anchor.diff:    It sees that you're importing `@angular/core` so it adds that to its dependency list for potential inclusion in the bundle.
     It opens the `@angular/core` file and follows _its_ network of `import` statements until it has built the complete dependency graph from `main.ts` down.
     
  -  这里，Webpack看到我们正在导入*@angular/core*，于是就这个文件加入到它的依赖列表里，为(有可能)把该文件打进包中做准备。
  -  它打开*@angular/core*并追踪由_该文件的_`import`语句构成的网络，直到构建出从`app.ts`往下的整个依赖图谱。
  +  这里，Webpack看到我们正在导入`@angular/core`，于是就这个文件加入到它的依赖列表里，为(有可能)把该文件打进包中做准备。
  +  它打开`@angular/core`并追踪由_该文件的_`import`语句构成的网络，直到构建出从`main.ts`往下的整个依赖图谱。
     
     Then it **outputs** these files to the `app.js` _bundle file_ designated in configuration:
     
  
positive.code:     [配置Webpack](#configure-webpack)
  
      * [Polyfills](#polyfills)
      * [Common configuration](#common-configuration)
        
        [公共配置](#common-configuration)
  
negative.code:   
    Change the configuration so that it has two entry points, `main.ts` and `vendor.ts`:
    
    所以要修改配置，以获得两个入口点：`main.ts`和`vendor.ts`：
  
  .code-example
    code-example(language="javascript").
  