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Showing content from https://github.com/purifycss/purifycss below:

purifycss/purifycss: Remove unused CSS. Also works with single-page apps.

A function that takes content (HTML/JS/PHP/etc) and CSS, and returns only the used CSS.
PurifyCSS does not modify the original CSS files. You can write to a new file, like minification.
If your application is using a CSS framework, this is especially useful as many selectors are often unused.

• Bootstrap file: ~140k
• App using ~40% of selectors.
• Minified: ~117k
• Purified + Minified: ~35k

Installation

import purify from "purify-css"
const purify = require("purify-css")

let content = ""
let css = ""
let options = {
    output: "filepath/output.css"
}
purify(content, css, options)

• Grunt
• Gulp
• Webpack

$ npm install -g purify-css

$ purifycss -h

purifycss <css> <content> [option]

Options:
  -m, --min        Minify CSS                         [boolean] [default: false]
  -o, --out        Filepath to write purified css to                    [string]
  -i, --info       Logs info on how much css was removed
                                                      [boolean] [default: false]
  -r, --rejected   Logs the CSS rules that were removed
                                                      [boolean] [default: false]
  -w, --whitelist  List of classes that should not be removed
                                                           [array] [default: []]
  -h, --help       Show help                                           [boolean]
  -v, --version    Show version number                                 [boolean]

Statically analyzes your code to pick up which selectors are used.
But will it catch all of the cases?

  <!-- html -->
  <!-- class directly on element -->
  <div class="button-active">click</div>

  // javascript
  // Anytime your class name is together in your files, it will find it.
  $(button).addClass('button-active');

  // Can detect if class is split.
  var half = 'button-';
  $(button).addClass(half + 'active');

  // Can detect if class is joined.
  var dynamicClass = ['button', 'active'].join('-');
  $(button).addClass(dynamicClass);

  // Can detect various more ways, including all Javascript frameworks.
  // A React example.
  var classes = classNames({
    'button-active': this.state.buttonActive
  });

  return (
    <button className={classes}>Submit</button>;
  );

var content = '<button class="button-active"> Login </button>';
var css = '.button-active { color: green; }   .unused-class { display: block; }';

console.log(purify(content, css));

logs out:

.button-active { color: green; }

var content = ['**/src/js/*.js', '**/src/html/*.html'];
var css = ['**/src/css/*.css'];

var options = {
  // Will write purified CSS to this file.
  output: './dist/purified.css'
};

purify(content, css, options);

var content = ['**/src/js/*.js', '**/src/html/*.html'];
var css = '.button-active { color: green; } .unused-class { display: block; }';

var options = {
  output: './dist/purified.css',

  // Will minify CSS code in addition to purify.
  minify: true,

  // Logs out removed selectors.
  rejected: true
};

purify(content, css, options);

logs out:

var content = ['**/src/js/*.js', '**/src/html/*.html'];
var css = ['**/src/css/*.css'];

purify(content, css, function (purifiedResult) {
  console.log(purifiedResult);
});

var content = ['**/src/js/*.js', '**/src/html/*.html'];
var css = ['**/src/css/*.css'];

var options = {
  minify: true
};

purify(content, css, options, function (purifiedAndMinifiedResult) {
  console.log(purifiedAndMinifiedResult);
});

// Four possible arguments.
purify(content, css, options, callback);

Array of glob file patterns to the files to search through for used classes (HTML, JS, PHP, ERB, Templates, anything that uses CSS selectors).

String of content to look at for used classes.

Array of glob file patterns to the CSS files you want to filter.

String of CSS to purify.

• minify: Set to true to minify. Default: false.

• output: Filepath to write purified CSS to. Returns raw string if false. Default: false.

• info: Logs info on how much CSS was removed if true. Default: false.

• rejected: Logs the CSS rules that were removed if true. Default: false.

• whitelist Array of selectors to always leave in. Ex. ['button-active', '*modal*'] this will leave any selector that includes modal in it and selectors that match button-active. (wrapping the string with *'s, leaves all selectors that include it)

A function that will receive the purified CSS as it's argument.

purify(content, css, options, function(purifiedCSS){
  console.log(purifiedCSS, ' is the result of purify');
});

purify(content, css, function(purifiedCSS){
  console.log('callback without options and received', purifiedCSS);
});

$ purifycss src/css/main.css src/css/bootstrap.css src/js/main.js --min --info --out src/dist/index.css

This will concat both main.css and bootstrap.css and purify it by looking at what CSS selectors were used inside of main.js. It will then write the result to dist/index.css

The --min flag minifies the result.

The --info flag will print this to stdout:

    ________________________________________________
    |
    |   PurifyCSS has reduced the file size by ~ 33.8%
    |
    ________________________________________________

The CLI currently does not support file patterns.

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