mini css extract plugin with code examples

The Mini CSS Extract plugin is a powerful tool for Web Developers who want to optimize their CSS files and make their websites more efficient. It allows you to extract CSS code from your JavaScript bundles and combine them into CSS files. This way, your website's style information is separated from the application logic, which will help your site load faster and perform better.

In this article, we'll explore what Mini CSS Extract plugin is and how to use it effectively with code examples.

What is Mini CSS Extract Plugin?

Mini CSS Extract plugin is a Webpack plugin that allows you to extract CSS code from your JavaScript bundles and combine them into CSS files. It is a lightweight alternative to the Extract Text Plugin, with the same functionality, without the overhead of the extra dependencies.

This means that instead of having to load your style information along with your JavaScript files, your website can now load CSS files separately. This reduces the load time of your web page, thereby enhancing its user experience.

How to use Mini CSS Extract Plugin?

To use the Mini CSS Extract plugin, you need to add it to your Webpack configuration file. Here's how:

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  //...
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin(),
  ],
};

This configuration tells Webpack to use the Mini CSS Extract plugin to extract CSS code from your JavaScript bundles. It also specifies how the extracted CSS code should be compiled using the CSS loader.

The MiniCssExtractPlugin needs to be included in the plugins array of your Webpack configuration. This will tell Webpack to create a CSS file for each entry point of your application.

In the next section, we'll look at how to use the Mini CSS Extract plugin in your CSS files.

Using Mini CSS Extract Plugin in CSS Files

To use the Mini CSS Extract plugin in your CSS files, you simply need to reference it using the @import statement. Once you have included the plugin, you can use it to combine all your CSS files into a single file.

Here's an example showing how to use the Mini CSS Extract plugin in your CSS files:

@import '~mini-css-extract-plugin/dist/loader';
@import './main.css';
@import './reset.css';

In this example, we're importing the Mini CSS Extract loader using the tilde (~) operator, followed by the paths to our CSS files. The main.css and reset.css files are then combined into a single CSS file using the Mini CSS Extract plugin.

Now, when you run your Webpack build, the Mini CSS Extract plugin will generate a file named main.css, containing both your main.css and reset.css styles.

Using Mini CSS Extract Plugin in Production

When using the Mini CSS Extract plugin in production, there are a few things to keep in mind. First, you need to specify the output filename for your CSS file using the filename option of the plugin.

plugins: [
    new MiniCssExtractPlugin({
        filename: 'main.[contenthash].css',
    }),
],

The contenthash ensures that the filename is unique for each content change, which is important for caching.

Second, you should only apply the Mini CSS Extract plugin in production, not development. Otherwise, your development workflow could be slowed down by the additional step of extracting the CSS.

const isProduction = process.env.NODE_ENV === 'production';

module.exports = {
  //...
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          isProduction ? MiniCssExtractPlugin.loader : 'style-loader',
          'css-loader',
        ],
      },
    ],
  },
  plugins: [
    isProduction && new MiniCssExtractPlugin({
      filename: 'main.[contenthash].css',
    }),
  ].filter(Boolean),
};

In this example, we've created a isProduction variable to check whether we're in production mode. If we're in development, we use the style-loader to inject the CSS into the DOM as usual. If we're in production, we use the Mini CSS Extract plugin.

Conclusion

The Mini CSS Extract plugin is a powerful tool for optimizing your website's CSS. It separates the style information from the logic, making your site load faster and perform better.

In this article, we've explored what the Mini CSS Extract plugin is and how to use it effectively with code examples. By following the guidelines we've laid out, you'll be able to use this plugin to enhance the user experience of your website.

Sure! Here's some additional information on the topics covered in the article.

Using Mini CSS Extract Plugin in CSS Modules

When using CSS Modules, you can still use the Mini CSS Extract plugin to extract the CSS code into separate files. You just need to modify your Webpack configuration to use the localIdentName option of the css-loader.

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  //...
  module: {
    rules: [
      {
        test: /\.module\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[local]--[hash:base64:5]',
              },
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin(),
  ],
};

Here, we've added the module option to the css-loader configuration, with a custom localIdentName option. This will create a unique class name based on the original class name and a hash, making it easy to use CSS Modules while still being able to extract the CSS.

Using Mini CSS Extract Plugin with Image URLs

If you're using the Mini CSS Extract plugin with image URLs in your CSS, you need to make sure that the URLs are correctly updated after the extraction.

.background {
  background-image: url('/assets/background.jpg');
}

After using the Mini CSS Extract plugin, the URL will be invalid, because the CSS file will be located in a different directory. To fix this, you can use the publicPath option of the plugin to specify the path to the assets directory.

plugins: [
  new MiniCssExtractPlugin({
    filename: 'main.[contenthash].css',
    publicPath: '/assets/',
  }),
],

This will tell the plugin to prefix all asset URLs with /assets/, making them correct after the extraction.

Using Mini CSS Extract Plugin with PurgeCSS

If you're using PurgeCSS to remove unused CSS code from your files, you can use the Mini CSS Extract plugin to extract your CSS code and then apply PurgeCSS to the resulting file.

const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const PurgecssPlugin = require('purgecss-webpack-plugin');
const glob = require('glob');

module.exports = {
  //...
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
        ],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin(),
    new PurgecssPlugin({
      paths: glob.sync(`${PATHS.src}/**/*`, { nodir: true }),
    }),
  ],
};

Here, we're using the glob package to find all files in our source directory (PATHS.src) and its subdirectories. We're then passing this list of file paths to the PurgeCSS plugin, which will remove any unused CSS code from the compiled CSS file.

Conclusion

The Mini CSS Extract plugin is a powerful tool for optimizing your website's CSS. By separating your style information from the application logic, your site can load faster and perform better. With the tips and code examples we've provided, you'll be able to use this plugin effectively in your own Webpack projects.

Popular questions

Here are five questions about Mini CSS Extract Plugin with code examples and their answers:

  1. What is the purpose of the Mini CSS Extract plugin?
    Answer: The Mini CSS Extract plugin allows you to extract CSS code from your JavaScript bundles and combine them into CSS files, separating style information from the application logic and improving website loading times.

  2. How do you add the Mini CSS Extract plugin to your Webpack configuration file?
    Answer: You can add the Mini CSS Extract plugin to your Webpack configuration file by including it in the plugins array, like this: new MiniCssExtractPlugin().

  3. How can you use the Mini CSS Extract plugin in CSS files?
    Answer: You can use the Mini CSS Extract plugin in CSS files by referencing it with the @import statement and then combining your CSS files into a single file using the Mini CSS Extract plugin. For example: @import '~mini-css-extract-plugin/dist/loader'; @import './main.css'; @import './reset.css';.

  4. How can you use the Mini CSS Extract plugin in production?
    Answer: In production, you should specify the output filename for your CSS file using the filename option of the plugin. You should also make sure that you only apply the Mini CSS Extract plugin in production, not development. For example:

    new MiniCssExtractPlugin({
      filename: 'main.[contenthash].css',
    }),
    
  5. How can you use the Mini CSS Extract plugin with PurgeCSS?
    Answer: You can use the Mini CSS Extract plugin with PurgeCSS by first extracting your CSS code using the plugin and then applying PurgeCSS to the resulting file. For example:

    new PurgecssPlugin({
      paths: glob.sync(`${PATHS.src}/**/*`, { nodir: true }),
    }),
    

Tag

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Have an amazing zeal to explore, try and learn everything that comes in way. Plan to do something big one day! TECHNICAL skills Languages - Core Java, spring, spring boot, jsf, javascript, jquery Platforms - Windows XP/7/8 , Netbeams , Xilinx's simulator Other - Basic’s of PCB wizard
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