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Important: This is still the readme of shakacode/bootstrap-sass-loader, the Bootstrap 3 (!) Sass package. Since this package for Bootstrap 4 is based on bootstrap-sass-loader most of the readme should be up to date nonetheless.

Make sure to load a version of Bootstrap 4 (e. g. "bootstrap": "twbs/bootstrap#v4-dev") instead of Bootstrap 3 Sass ("bootstrap-sass": "~3.3.1").


Bootstrap configuration and loading package for webpack, using the npm packages bootstrap-sass and sass-loader.

Install from bootstrap-sass-loader on npm.

If you're looking for the less version, see bootstrap-webpack. This project is based on that version for less, with some minor differences, the main one being how the configuration file specifies two sass files for customization.

In a nutshell:

  1. You've got the sass-loader to process Sass files to CSS.
  2. The npm bootstrap-sass package places the bootstrap files in /node_modules/bootstrap-sass/assets.
  3. You could simply create your own sass file to pick up bootstrap from this location, and you could require the js files here for the Bootstrap JavaScript code. See the sass-loader for instructions on configuring the directories.
  4. Or you could use this loader and load a js file that configures Bootstrap.

You can find an example of using this:


Note, bootstrap-sass must be installed locally inside of ../node_modules or a parent directories node_modules directory relative to the loaded config file.

Bootstrap Version

The version of sass-bootstrap used is listed in peerDependencies, so you should be able to use whichever version you like.

Simply specify that version of bootstrap-sass in your package.json, like this:

"bootstrap-sass": "~3.3.1"


1.a Complete Bootstrap

To use the complete bootstrap package including styles and scripts with the default settings:


The disadvantage to using this setup is that you can't:

  1. Customize the bootstrap variables: Bootstrap Customization
  2. You can't use the bootstrap variables for your own sass stylesheets.

1.b Customized Bootstrap

  1. Copy the file bootstrap-sass.config.js to your project. You will specify the file path in the require statement.
  2. Open that file to customize the location of a file for any Bootstrap variable overrides (preBootstrapCustomizations and bootstrapCustomizations, and your main Sass file that can depend on Bootstrap variables, plus your customizations. Any of these 3 files are optional. You may also remove any Sass or Js modules that you don't need.

Next, you should specify this as an entry point:

module.exports = {
  entry: [

Or a dependency within a file, like you'd specify other webpack dependencies:



Here's a sample configuration file. The file included in the bootstrap-sass-loader git repo has many more options. The two customization files, bootstrapCustomizations and mainSass are optional.

module.exports = {
  bootstrapCustomizations: "./bootstrap-customizations.scss",
  mainSass: "./main.scss", // path to your main SASS file (optional)
  verbose: true, // print out your custom files used
  debug: false, // print out the full generated scss file
  styleLoader: "style-loader!css-loader!sass-loader", // see example for the ExtractTextPlugin
  scripts: {
    // add every bootstrap script you need
    'transition': true
  styles: {
    // add every bootstrap style you need
    "mixins": true,

    "normalize": true,
    "print": true,

    "scaffolding": true,
    "type": true,

Font Configuration

Bootstrap use some fonts. You need to configure the correct loaders in your webpack.config.js.

Take a look at example which uses custom fonts with the bootstrap-sass-loader. You'll need to create define a font-face like this:

@font-face {
  font-family: 'OpenSans-Light';
  src: url('assets/fonts/OpenSans-Light.ttf') format('truetype');

Example Loaders Configuration:

module.exports = {
  module: {
    loaders: [
      // **IMPORTANT** This is needed so that each bootstrap js file required by
      // bootstrap-webpack has access to the jQuery object
      { test: /bootstrap\/js\//, loader: 'imports?jQuery=jquery' },

      // Needed for the css-loader when [bootstrap-webpack](
      // loads bootstrap's css.
      { test: /\.woff(\?v=\d+\.\d+\.\d+)?$/,   loader: "url?limit=10000&mimetype=application/font-woff" },
      { test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/,  loader: "url?limit=10000&mimetype=application/font-woff" },
      { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,    loader: "url?limit=10000&mimetype=application/octet-stream" },
      { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,    loader: "file" },
      { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,    loader: "url?limit=10000&mimetype=image/svg+xml" }

extract-text-plugin Notes

  • If you don't run webpack like this, you might get a very obscure error:
PATH=$(npm bin):$PATH webpack --config webpack.rails.config.js

Alternate, you can put $(npm bin) in your path. Basically if you run type webpack and the path is your global one, then you may have issues.

  • You can configure the output file of the created CSS file by using a relative path to the output directory. For example:
  plugins: [
    new ExtractTextPlugin("../stylesheets/bootstrap-and-customizations.css")

Based on:

Known Issues

  1. Automatic Dependency loading is currently problematic. If you "touch" either of the customization files listed in your config file (bootstrapCustomizations, mainSass), then that will trigger a rebuild of the Sass files. This is a known issue with the sass-loader. I work around this issue by "touching" one of the 3 sass config files.

Testing Changes in the Bootstrap Sass Loader

  1. See this article Debugging NodeJs and Webpack Loaders
  2. Clone both this project and
  3. Use the npm link command per step #1 (see article)
  4. Be sure to run npm i bootstrap-sass in the directory where you have the bootstrap-sass-loader. This is because the location of bootstap-sass is found relative to the bootstrap-sass-loader and if you linked it and it's not not there, then you'll bet this error: "Error: Could not find path to bootstrap-sass. Check to see that it's in a parent directory of config file containing node_modules/bootstrap-sass".

Then in the bootstrap-sass-loader-example project:

  1. Make some changes in the loader, put in some print statements maybe, then run gulp webpack to invoke the loader.
  2. Then run gulp build and open the resulting file dist/index.html in the browser.
  3. Run gulp test to confirm the changes work.

Pull requests are welcome!

For more info see: and

Code Inspection and ESLint

  1. If using Webstorm import the inspection file in /jetbrains-inspection and inspect all files
  2. Command line: eslint .

Publishing to NPM

  1. Install the release-it npm program
  2. Merge fixes to master
  3. Run command release-it
  4. Take defaults, except for last one to publish changes (answer Y)

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