Webpack无法在Angular CLI中解析Bootstrap

Question

我正面临着bootstrap模块的web-pack编译问题。我是Angular开发的新手。当我运行 ng serve 命令时，我面临以下问题。

当我从styles数组中的angular-cli.json中删除bootstrap css时，它就像魅力一样。

    ERROR in multi ./src/node_modules/bootstrap/dist/css/bootstrap.min.css ./src/styles.css
Module not found: Error: Can't resolve 'C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css' in 'C:\Angular Code\First App\my-first-app\node_modules\@angular\cli\models\webpack-configs'
resolve 'C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css' in 'C:\Angular Code\First App\my-first-app\node_modules\@angular\cli\models\webpack-configs'
  using description file: C:\Angular Code\First App\my-first-app\node_modules\@angular\cli\package.json (relative path: ./models/webpack-configs)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: C:\Angular Code\First App\my-first-app\node_modules\@angular\cli\package.json (relative path: ./models/webpack-configs)
    using description file: C:\Angular Code\First App\my-first-app\package.json (relative path: ./src/node_modules/bootstrap/dist/css/bootstrap.min.css)
      no extension
        Field 'browser' doesn't contain a valid alias configuration
        C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css doesn't exist
      .ts
        Field 'browser' doesn't contain a valid alias configuration
        C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css.ts doesn't exist
      .js
        Field 'browser' doesn't contain a valid alias configuration
        C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css.js doesn't exist
      as directory
        C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css doesn't exist
[C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css]
[C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css.ts]
[C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css.js]
[C:\Angular Code\First App\my-first-app\src\node_modules\bootstrap\dist\css\bootstrap.min.css]
 @ multi ./src/node_modules/bootstrap/dist/css/bootstrap.min.css ./src/styles.css