This plugin wraps all the cssClasses in a css file with a prefix class while webpack bundled. It helps to scope a specific css file with a prefix class

Consider a simple css file styles.css:

.css-class1 {height: auto;}.css-class2 {width: auto;}

After the postcss-wrapper-loader the file will be following

.wrapper .css-class1 {height: auto;} .wrapper .css-class2 {width: auto;}

In the webpack config file initialize the loader

const PostCssWrapper = require('postcss-wrapper-loader');

add this plugin in webpack plugins

  plugins: [
    new ExtractTextWebpackPlugin('styles.css'),
    new PostCssWrapper('styles.css', '.wrapper')
  ]