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# Webpack

Learn how to include Bootstrap in your project using Webpack 3.

## Installing Bootstrap

Install bootstrap as a Node.js module using npm.

## Importing JavaScript

Import Bootstrap’s JavaScript by adding this line to your app’s entry point (usually `index.js` or `app.js`):

    import 'bootstrap';

Alternatively, you may import plugins individually as needed:

    import 'bootstrap/js/dist/util';
    import 'bootstrap/js/dist/dropdown';
    ...

Bootstrap is dependent on jQuery and Popper, these are defined as `peerDependencies`, this means that you will have to make sure to add both of them to your `package.json` using `npm install --save jquery popper.js`.

Notice that if you chose to import plugins individually, you must also install exports-loader

## Importing Styles

### Importing Precompiled Sass

To enjoy the full potential of Bootstrap and customize it to your needs, use the source files as a part of your project’s bundling process.

First, create your own `_custom.scss` and use it to override the built-in custom variables. Then, use your main sass file to import your custom variables, followed by Bootstrap:

    @import "custom";
    @import "~bootstrap/scss/bootstrap";

For Bootstrap to compile, make sure you install and use the required loaders: sass-loader, postcss-loader with Autoprefixer. With minimal setup, your webpack config should include this rule or similar:

      ...
      {
        test: /\.(scss)$/,
        use: [{
          loader: 'style-loader', // inject CSS to page
        }, {
          loader: 'css-loader', // translates CSS into CommonJS modules
        }, {
          loader: 'postcss-loader', // Run post css actions
          options: {
            plugins: function () { // post css plugins, can be exported to postcss.config.js
              return [
                require('precss'),
                require('autoprefixer')
              ];
            }
          }
        }, {
          loader: 'sass-loader' // compiles Sass to CSS
        }]
      },
      ...

### Importing Compiled CSS

Alternatively, you may use Bootstrap’s ready-to-use css by simply adding this line to your project’s entry point:

    import 'bootstrap/dist/css/bootstrap.min.css';

In this case you may use your existing rule for `css` without any special modifications to webpack config except you don’t need `sass-loader` just style-loader and css-loader.

      ...
      module: {
        rules: [
          {
            test: /\.css$/,
            use: ['style-loader', 'css-loader']
          }
        ]
      }
      ...