Drupal Bootstrap Webpack

This is an example of using webpack in Drupal theme. Specifically, this repository contains the generic starterkit of the Drupal Bootstrap theme and the SASS based assets from drupal-bootstrap-styles. It is modified to work with webpack. The detailed change list is below (to-do).

This starterkit is taken from version 8.x-3.23 of the bootstrap theme. I'll try to keep this updated but changes should not be significant.

Usage

1. Download this theme into your themes/custom directory. You could do a git clone as well but that probably doesn't make much sense. Extract the archive and rename the directory to whatever you wish.

$ wget https://github.com/hussainweb/drupal-bootstrap-webpack/archive/master.zip
$ unzip master.zip
$ mv drupal-bootstrap-webpack mytheme

2. Next, rename various instances of THEMENAME in filenames and config files to match your theme name (e.g. mytheme). You may also use a script for that purpose.

$ cd mytheme
$ ./set-theme-name.sh mytheme

3. Run npm install.
4. Start working on your theme. The SCSS files are in assets/scss and JavaScript files are in assets/js directories. You may modify other directories as you wish. More details about the SCSS files are present in its own README file.
5. Run npm run dev to run webpack in development mode. You may also watch for changes using npm run watch. For production mode, run npm run production.

Additional notes

You do not need to follow all the steps from the official sub-theming guide. This template already takes care of getting the drupal-bootstrap-styles and putting them in the correct location for you. You only need to follow the steps above.

Customizing the Bootstrap Framework

The files in the assets directory are structured in a which makes it easy to select and load only those parts of Bootstrap framework which you actually need. The entrypoint for webpack is assets/js/index.js which gives an example of loading bootstrap itself and other resources you need. There is also an example of adding your own Drupal behaviors.

The above index.js loads the style.scss which is responsible for loading all the required CSS. Bootstrap specific styles are defined in bootstrap.scss. This loads the entire framework but you are free to remove any components that you don't need by removing or commenting out the appropriate line.

Changes from the starterkit and drupal-bootstrap-styles

This template differs from the generic starterkit in these ways:

1. The THEMENAME.libraries.yml refers to the final location of built files. By default, the files are output in build directory, not css directory.
2. The bootstrap theme sub-theming documentation mentions storing the Bootstrap SASS source in your sub-theme. This is not required when using this template as the source is pulled using npm and references are stored in the _drupal-bootstrap.scss file.
3. The SCSS files themselves use the bootstrap-sass package installed by npm and does not expect it to be present in any specific path. For this reason, the SCSS files present in the assets/sass directory will refer to bootstrap framework files using the syntax ~bootstrap-sass/<path> rather than ../bootstrap/<path>.