Remove unused CSS styles from Bootstrap using PurgeCSS (ok)

https://medium.com/dwarves-foundation/remove-unused-css-styles-from-bootstrap-using-purgecss-88395a2c5772

Một ví dụ thành công :)

C:\xampp\htdocs\abc\package.json

{
  "name": "PurgeCSS",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "purgecss": "^3.0.0",
    "webpack": "^4.29.0",
    "webpack-cli": "^3.3.12"
  },
  "scripts": {
    "build": "purgecss -css bootstrap-grid.min.css -con index.html -o dist/"
  }
}

C:\xampp\htdocs\abc\index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Bootstrap</title>
  <link rel="stylesheet" href="./dist/bootstrap-grid.min.css" />
</head>
<body>
  <div class="row">
    <div class="col-sm-4">.col-sm-4</div>
    <div class="col-sm-4">.col-sm-4</div>
    <div class="col-sm-4">.col-sm-4</div>
  </div>
</body>
</html>

C:\xampp\htdocs\abc\bootstrap-grid.min.css

/*!
 * Bootstrap Grid v4.5.2 (https://getbootstrap.com/)
 * Copyright 2011-2020 The Bootstrap Authors
 * Copyright 2011-2020 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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/*# sourceMappingURL=bootstrap-grid.min.css.map */

Sau kh tối ưu :)

C:\xampp\htdocs\abc\dist\bootstrap-grid.min.css

/*!
 * Bootstrap Grid v4.5.2 (https://getbootstrap.com/)
 * Copyright 2011-2020 The Bootstrap Authors
 * Copyright 2011-2020 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 */html{box-sizing:border-box;-ms-overflow-style:scrollbar}*,::after,::before{box-sizing:inherit}.row{display:-ms-flexbox;display:flex;-ms-flex-wrap:wrap;flex-wrap:wrap;margin-right:-15px;margin-left:-15px}.col-sm-4{position:relative;width:100%;padding-right:15px;padding-left:15px}@media (min-width:576px){.col-sm-4{-ms-flex:0 0 33.333333%;flex:0 0 33.333333%;max-width:33.333333%}}
/*# sourceMappingURL=bootstrap-grid.min.css.map */

Remove unused CSS styles from Bootstrap using PurgeCSS

Introduction

Reducing assets size is one of the most practical ways to speed up your web application. I have a simple use case, lets imagine your HTML file looks like this:Your HTML file

Usage

Purgecss can be installed with npm packagenpm i --save-dev purgecss

Basically, you run it against your CSS files and your HTML/JavaScript files. It will parse and analyze which CSS content will be used and remove unused CSS content.

Here is the syntax of CLI command:

purgecss --css <css file> --content <content file to parse css> --out <output-directory>

Since Purgecss is installed in /node_modules we must run this command through npm script. We use --out dist option to store output CSS files in dist folder after transformed. Now change the path of bootstrap-grid.min.css in index.html to:

<link rel="stylesheet" href="./dist/bootstrap-grid.min.css" />

Then create npm script to run purgecss:

You can view full CLI options at https://www.purgecss.com/cli

Example repository: https://github.com/PhmNgocNghia/purge-css-demo-cli

Setup using Webpack

Purge CSS can be used together with built tools such as webpack, gulp, grunt,… etc. You can view it’s documentation at https://www.purgecss.com/

I’m going to demonstrate how to integrate with Webpack. This is my simple project which integrate project and Webpack:My project webpack config

In my index.js file, I simply import bootstrap grid CSS.

// Import CSS Grid min CSSimport 'bootstrap/dist/css/bootstrap-grid.min.css'

To use Purgecss with Webpack simply install this Webpack plugin:

npm i purgecss-webpack-plugin -D

Full example repository: https://github.com/PhmNgocNghia/purge-css-example-webpack

Conclusion

With Purgecss, our bootstrap-grid.main.css file reduce from 47kb to 601byte. All unused selectors has been removed. You can view the documentation at https://www.purgecss.com/ which contain details instruction and api references.

Not only bootstrap, you can use Purgecss with many css libraries such as TailwindCSS, Zurb foundation,... etc.

PreviousPurifyCSS OnlineRemove unused CSS code from your stylesheets (ok)NextThêm column, media bootstrap, custom bootstrap (ok)

Last updated 1 year ago