Bundle Sass into a CSS file and ES modules into a JS file
Last updated 10 months ago by jacksonrayhamilton .
MIT · Repository · Bugs · Original npm · Tarball · package.json
$ cnpm install bundlifier 
SYNC missed versions from official npm registry.


Compile your Sass to a CSS file and combine your ES modules into a JS file, with source maps, and optionally minify them, using a single command: bundlify!


You can use either Yarn or NPM to install Bundlifier. Presumably, you will use Bundlifier to build a front-end web project. Therefore, it’s recommended that you install bundlifier as a devDependency using either of the following commands:

yarn add -D bundlifier
npm i -D bundlifier

Installing bundlifier as a devDependency is best because the version of the tool will be controlled for your project.

You can also install the program globally for your own miscellaneous or experimental uses:

yarn global add bundlifier
npm i -g bundlifier


Organize your source files into a “client” directory in your project. The bundled files will be written to a “public” directory. You can serve the “public” directory via your favorite web server.

├── client/  (source files)
│   ├── main.scss
│   └── main.mjs
└── public/  (output files)
    ├── bundle.css
    ├── bundle.css.map
    ├── bundle.js
    ├── bundle.js.map
    └── service-worker.js

Just run npx bundlifier (or drop the “npx” if installed globally) to compile your code. That’s it!

You can continuously rebuild the files when they change by running npx bundlifier -w. (That’s the shorthand for bundlifier --watch.)

You can minify the files by running npx bundlifier -m. (That’s the shorthand for bundlifier --minify.)

You could encapsulate these commands into package.json scripts to make them easy to re-run:

  "scripts": {
    "build": "bundlifier -m",
    "dev": "bundlifier -w"

And you could run them like this:

yarn build
yarn dev
npm run build
npm run dev

You can customize the input/output names/directories of the processed files by saving a bundlifier.json file in your project directory:

  "sass": {"client/main.scss": "public/bundle.css"},
  "es": {"client/main.mjs": "public/bundle.js"}

You can specify an alternate config file by running bundlify -c <config file>. (That’s the shorthand for bundlify --config.) This might be useful when scripting development/production deploys.

Babel Support

Bundlifier uses Babel to automatically transpile the latest JavaScript syntax for backwards-compatibility with older browsers.

To enable additional transformations, add a .babelrc file to your project and install the relevant Babel packages.

For instance, to compile JSX for use with the React library, create a .babelrc file like this one:

  "presets": ["@babel/react"]

And install the relevant packages:

yarn add -D @babel/core @babel/preset-react
npm i -D @babel/core @babel/preset-react

Service Worker Support

Service workers allow for advanced caching optimizations, enabling applications to work offline in some cases. Bundlifier makes it easy to integrate service worker caching into your application.

Simply add "sw": true to bundlifier.json, and then (when building with the --minify flag), all your CSS, JS, and other assets will be stored in an offline cache, and will be loaded from there on subsequent page loads, and will be updated lazily.

  "sw": true

You can also supply an object with any of the following options to improve your caching strategy:

  • precached: Specify an array of globs for files for which changes to those files should be indicated in a payload in the service worker file, thus avoiding round trips to check for updates to the files. Generated bundle files (e.g. bundle.css and bundle.js) are automatically precached.

  • cachedForever: Specify an array of regular expression strings for files which, once downloaded, should always be served from the cache (never invalidated).

  "sw": {
    "precached": ["public/*.{jpg,png}"],
    "cachedForever": ["^https://fonts.(?:googleapis|gstatic).com/.*"]

Note that service workers may be disabled by the browser unless the site is served via HTTPS. Make sure to install an SSL certificate locally or in production.


Bundlifier assumes you write your stylesheets in Sass. It will compile your Sass into CSS, and it will add vendor prefixes to your CSS properties with Autoprefixer to ensure that your styles work in older browsers.

Bundlifier assumes you write your JavaScript using ES modules. Under the hood, it combines your graph of modules into a single file using Rollup. You can also import modules from your node_modules directory using Node.js’s module resolution rules. You can import JSON files, too. Edge JavaScript features will be transpiled with Babel to ensure that your program runs in older browsers.

For CSS and JS, source maps will be generated which correctly link back to the original files.

Service worker support is provided by Workbox.

I created Bundlifier to do most of the heavy lifting involved in building a typical web application. I wanted to encapsulate what would normally be hundreds of lines of configuration in Brunch, Grunt, Gulp, Webpack, NPM scripts, et al, into a single command, that just worked.

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