Loader for Webpack to deduplicate, minify and compress CSS as much as possible.

Getting Started

To begin you'll need to install quark-loader

npm install --save-dev quark-loader

Add the loader to your webpack config.

file.js

import file from 'file.js';

Chain the quark-loader with css-loader and the style-loader to immediately minimize and apply all styles to the DOM.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader'
          },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              localIdentName: '[hash:base64:3]',
              importLoaders: 3,
            },
          },
          {
            loader: 'quark-loader',
            options: {
              compress: true,
            },
          },
        ],
      },
    ],
  },
};

You can also use the quark-loader with sass-loader. For example

module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: 'style-loader'
          },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              localIdentName: '[hash:base64:3]',
              importLoaders: 3,
            },
          },
          {
            loader: 'quark-loader',
            options: {
              compress: true,
            },
          },
          {
            loader: 'sass-loader',
          },
        ],
      },
    ],
  },

How it works

quark-loader process the CSS files and replaced our style with a reference to our declarations. In this way, we can remove repetitive styles from our CSS and make it minimum.

style.css

.a {
  top: 100px;
}
.b {
  top: 100px;
}
.c {
  top: 100px;
}
.d {
  top: 100px;
}

Let's review what we get at the end

Extracted CSS file

.t7E {
	top: 100px;
}
.BOO {
}
._1dA {
}
._1rC {
}
._3e1 {
}

Without CSS extraction

exports.locals = {
	"top--100px": "t7E",
	"a": "BOO t7E",
	"b": "_1dA t7E",
	"c": "_1rC t7E",
	"d": "_3e1 t7E"
};

Tutorials

Using Quark-Loader to minimize css files