grunt-contrib-cssmin

What is grunt-contrib-cssmin?

The grunt-contrib-cssmin package is a Grunt plugin that helps you minify CSS files. It uses the clean-css library to perform the minification, which reduces the size of CSS files by removing unnecessary whitespace, comments, and other redundant data. This can help improve the performance of your web applications by reducing the amount of data that needs to be transferred over the network.

What are grunt-contrib-cssmin's main functionalities?

Minify CSS files

This feature allows you to minify CSS files. The code sample demonstrates how to configure the grunt-contrib-cssmin plugin to minify all CSS files in the 'src/css' directory and output the minified files to the 'dist/css' directory with a '.min.css' extension.

{
  "grunt.initConfig": {
    "cssmin": {
      "target": {
        "files": [{
          "expand": true,
          "cwd": "src/css",
          "src": ["*.css", "!*.min.css"],
          "dest": "dist/css",
          "ext": ".min.css"
        }]
      }
    }
  },
  "grunt.loadNpmTasks": "grunt-contrib-cssmin",
  "grunt.registerTask": ["default", ["cssmin"]]
}

Combine and minify multiple CSS files

This feature allows you to combine multiple CSS files into a single file and then minify it. The code sample shows how to configure the plugin to combine 'file1.css' and 'file2.css' from the 'src/css' directory into a single 'combined.min.css' file in the 'dist/css' directory.

{
  "grunt.initConfig": {
    "cssmin": {
      "target": {
        "files": {
          "dist/css/combined.min.css": ["src/css/file1.css", "src/css/file2.css"]
        }
      }
    }
  },
  "grunt.loadNpmTasks": "grunt-contrib-cssmin",
  "grunt.registerTask": ["default", ["cssmin"]]
}

Other packages similar to grunt-contrib-cssmin

clean-css

clean-css is a fast and efficient CSS optimizer for Node.js. It is the underlying library used by grunt-contrib-cssmin for minification. While grunt-contrib-cssmin is a Grunt plugin, clean-css can be used directly in Node.js projects without the need for Grunt.

cssnano

cssnano is a modern, modular CSS minifier that is built on top of the PostCSS ecosystem. It offers a wide range of optimizations and is highly configurable. Unlike grunt-contrib-cssmin, which is a Grunt plugin, cssnano can be used with various build tools and task runners, including Gulp and Webpack.

uglifycss

uglifycss is a simple CSS minifier that removes comments and whitespace. It is less feature-rich compared to grunt-contrib-cssmin and clean-css, but it is very fast and can be a good choice for simple minification tasks.

README

grunt-contrib-cssmin v4.0.0

Minify CSS

Getting Started

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-contrib-cssmin --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-contrib-cssmin');

Issues with the output should be reported on the clean-css issue tracker.

Cssmin task

Run this task with the grunt cssmin command.

Options

Options are passed to clean-css. In addition this task defines some extra options:

report

Type: string
Choices: 'min', 'gzip'
Default: 'min'

Report minification result or both minification and gzip results. This is useful to see exactly how well clean-css is performing but using 'gzip' will make the task take 5-10x longer to complete. Example output.

sourceMap

Type: boolean
Choices: true, false
Default: false

Enable Source Maps.

Usage

Combine two files into one output file

cssmin: {
  options: {
    mergeIntoShorthands: false,
    roundingPrecision: -1
  },
  target: {
    files: {
      'output.css': ['foo.css', 'bar.css']
    }
  }
}

Minify all contents of a release directory and add a .min.css extension

cssmin: {
  target: {
    files: [{
      expand: true,
      cwd: 'release/css',
      src: ['*.css', '!*.min.css'],
      dest: 'release/css',
      ext: '.min.css'
    }]
  }
}

Release History

• 2023-05-01   v5.0.0   Update dependencies. Drop Node.js < 14 support.
• 2021-02-15   v4.0.0   Update all dependencies including clean-css v5.x. Drop Node.js < 10 support.
• 2018-09-07   v3.0.0   Update all dependencies. Drop Node.js < 6 support.
• 2017-07-27   v2.2.1   Fix issue with relativeTo for clean-css v4.x.
• 2017-05-10   v2.2.0   Update clean-css to v4.1.1.
• 2017-04-17   v2.1.0   Set required Node.js version to >=4 since clean-css 4.x requires that.
• 2017-02-02   v2.0.0   Update clean-css to v4.0.3.
• 2016-08-31   v1.0.2   Fix issues for node 6.
• 2016-03-16   v1.0.1   Downgrade maxmin to support Node.js 0.10.
• 2016-03-04   v1.0.0   Updated docs. Point main to task and removed peerDeps. Update clean-css to v3.4.1.
• 2015-09-15   v0.14.0   Bump to cssmin ~3.4.0. Minor test fixes.
• 2015-07-27   v0.13.0   Bump to cssmin ~3.3.0.
• 2015-05-09   v0.12.3   Improve reporting of errors and warnings. Log out written files and the saved size. Fix absolute paths.
• 2015-02-20   v0.12.2   Set the rebase option to false by default.
• 2015-02-09   v0.12.0   Add sourceMap option.
• 2014-12-24   v0.11.0   Bump clean-css to 3.0.1. Remove banner option.
• 2014-06-11   v0.10.0   Update clean-css v2.2.0.
• 2014-02-01   v0.9.0   Refactor. Remove grunt-lib-contrib dependency. Backwards-compatibly remove false choice from report.
• 2014-02-14   v0.8.0   Update clean-css v2.1.0.
• 2013-11-23   v0.7.0   Update clean-css v2.0.0.
• 2013-09-14   v0.6.2   Support relative URLs via clean-css ~1.1.1.
• 2013-05-25   v0.6.1   Support import in-lining via clean-css ~1.0.4.
• 2013-04-05   v0.6.0   Update clean-css dependency to ~1.0.0.
• 2013-03-14   v0.5.0   Support for report option (false by default).
• 2013-03-10   v0.4.2   Add banner option. Support clean-css keepSpecialComments.
• 2013-02-17   v0.4.1   Update clean-css dependency to ~0.10.0.
• 2013-02-15   v0.4.0   First official release for Grunt 0.4.0.
• 2013-01-23   v0.4.0rc7   Updating grunt/gruntplugin dependencies to rc7. Changing in-development grunt/gruntplugin dependency versions from tilde version ranges to specific versions.
• 2013-01-09   v0.4.0rc5   Updating to work with grunt v0.4.0rc5. Switching to this.files API.
• 2012-11-01   v0.3.2   Update clean-css dep.
• 2012-10-12   v0.3.1   Rename grunt-contrib-lib dep to grunt-lib-contrib.
• 2012-09-23   v0.3.0   Options no longer accepted from global config key.
• 2012-09-10   v0.2.0   Refactored from grunt-contrib into individual repo.

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Task submitted by Tim Branyen

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