Bootstrap 6 with Webpack

Workflow

• Step 1: Set up npm and install dependencies
• Step 2: Create the project structure
• Step 3: Configure Webpack (boilerplate + dev server)
• Step 4: Set up loaders and import Bootstrap
• Step 5: Verify
• Step 6 (optional): Production optimizations

Step 1: Set up npm and install dependencies

1. Create the project and initialize npm:
   sh

   mkdir my-project && cd my-project
   npm init -y

2. Install Webpack and its tooling:
   sh

   npm i --save-dev webpack webpack-cli webpack-dev-server html-webpack-plugin

3. Install Bootstrap and its optional peer dependencies (omit

   @floating-ui/dom

   if not using menus/popovers/tooltips; omit

   vanilla-calendar-pro

   if not using the datepicker):
   sh

   npm i --save bootstrap@6.0.0-alpha.1 @floating-ui/dom vanilla-calendar-pro

4. Install the loaders and Sass/Autoprefixer needed to bundle Bootstrap's CSS:
   sh

   npm i --save-dev autoprefixer css-loader postcss-loader sass sass-loader style-loader

Step 2: Create the project structure

mkdir {src,src/js,src/scss}
touch src/index.html src/js/main.js src/scss/styles.scss webpack.config.js

my-project/
├── src/
│   ├── js/
│   │   └── main.js
│   ├── scss/
│   │   └── styles.scss
│   └── index.html
├── package-lock.json
├── package.json
└── webpack.config.js

Step 3: Configure Webpack

1. webpack.config.js

   — entry, output, and dev server:
   js

   'use strict'
   
   const path = require('path')
   const HtmlWebpackPlugin = require('html-webpack-plugin')
   
   module.exports = {
     mode: 'development',
     entry: './src/js/main.js',
     output: {
       filename: 'main.js',
       path: path.resolve(__dirname, 'dist')
     },
     devServer: {
       static: path.resolve(__dirname, 'dist'),
       port: 8080,
       hot: true
     },
     plugins: [
       new HtmlWebpackPlugin({ template: './src/index.html' })
     ]
   }

2. src/index.html

   :
   html

   <!doctype html>
   <html lang="en">
     <head>
       <meta charset="utf-8">
       <meta name="viewport" content="width=device-width, initial-scale=1">
       <title>Bootstrap w/ Webpack</title>
     </head>
     <body>
       <div class="container py-4 px-3 mx-auto">
         <h1>Hello, Bootstrap and Webpack!</h1>
         <button class="btn-solid theme-primary">Primary button</button>
       </div>
     </body>
   </html>

3. package.json

   — add scripts:
   json

   {
     "scripts": {
       "start": "webpack serve",
       "build": "webpack build --mode=production",
       "test": "echo \"Error: no test specified\" && exit 1"
     }
   }

4. Start Webpack:
   sh

   npm start

Step 4: Set up loaders and import Bootstrap

1. Add the

   module.rules

   loader chain to

   webpack.config.js

   (order matters:

   sass-loader

   compiles,

   postcss-loader

   runs Autoprefixer,

   css-loader

   resolves imports,

   style-loader

   injects CSS):
   js

   'use strict'
   
   const path = require('path')
   const autoprefixer = require('autoprefixer')
   const HtmlWebpackPlugin = require('html-webpack-plugin')
   
   module.exports = {
     mode: 'development',
     entry: './src/js/main.js',
     output: {
       filename: 'main.js',
       path: path.resolve(__dirname, 'dist')
     },
     devServer: {
       static: path.resolve(__dirname, 'dist'),
       port: 8080,
       hot: true
     },
     plugins: [
       new HtmlWebpackPlugin({ template: './src/index.html' })
     ],
     module: {
       rules: [
         {
           test: /\.(scss)$/,
           use: [
             { loader: 'style-loader' },
             { loader: 'css-loader' },
             {
               loader: 'postcss-loader',
               options: {
                 postcssOptions: {
                   plugins: [
                     autoprefixer
                   ]
                 }
               }
             },
             { loader: 'sass-loader' }
           ]
         }
       ]
     }
   }

2. src/scss/styles.scss

   — import the source Sass with

   @use

   (never

   @import

   ):
   scss

   // Import all of Bootstrap's CSS
   @use "bootstrap/scss/bootstrap";

   To customize, override Bootstrap's CSS token maps (

   $root-tokens

   ,

   $*-tokens

   ) — see Customize › Sass. Token names are written unprefixed in Sass; Bootstrap's dist/CDN CSS adds the

   --bs-

   prefix via PostCSS, so compiling the source yourself keeps them unprefixed.

3. src/js/main.js

   — load the CSS and import Bootstrap's JS. Floating UI and Vanilla Calendar Pro are imported automatically through Bootstrap:
   js

   // Import our custom CSS, then all of Bootstrap’s JS
   import '../scss/styles.scss'
   import * as bootstrap from 'bootstrap'

   Import only the plugins you need to keep bundle sizes down:
   js

   import { Tooltip, Toast, Popover } from 'bootstrap'

Step 5: Verify

1. Run

   npm start

   and open

   http://localhost:8080

   — the

   .container

   and

   .btn-solid.theme-primary

   button should be styled.
2. Confirm the console is free of module-resolution or loader errors.
3. Trigger a JS component (tooltip/dialog) to confirm the JS bundle works.
4. Bootstrap 6 requires a browser that supports

   oklch()

   and

   color-mix()

   .

Step 6 (optional): Production optimizations

• Extract CSS to a file (for strict CSP or to avoid a large JS bundle): install

  mini-css-extract-plugin

  , replace

  style-loader

  with

  miniCssExtractPlugin.loader

  , add the plugin, then link the generated

  dist/main.css

  from your HTML.
• Extract inline SVGs: Bootstrap's CSS references SVGs via inline

  data:

  URIs. If your CSP blocks

  data:

  images, add a Webpack asset-module rule matching

  mimetype: 'image/svg+xml'

  /

  scheme: 'data'

  with

  type: 'asset/resource'

  to emit them as files.