Webpack Clean CSS After Compile Plugin

For some reason webpack.optimization with CssMinimizerPlugin.cleanCssMinify does not work as expected. This plugin aims to solve the same thing but after compilation is done. The css assets are modified in place without altering the references already set by webpack.

Installation

npm i -D webpack-clean-css-after-compile-plugin

Configuration

The plugin takes a single argument as object having:

{
    isProduction: boolean, // if true will run minification, else not
    outputDir: string, // must match the webpack output path
    cleanCssOptions: object, // optional, default is empty object
}

For detailed cleanCssOptions see clean-css documentation.

Usage

The following example shows a minimal scenario

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CleanCssAfterCompilePlugin = require('webpack-clean-css-after-compile-plugin');

// see clean-css docs for options, the following is default and is not required
const cleanCssOptions = {};

const isProduction = process.env.NODE_ENV === 'production';
const sourceDir = path.resolve(__dirname, 'src');
const outputDir = path.resolve(__dirname, 'web');

module.exports = {
    mode: isProduction ? 'production' : 'development',
    entry: { index: path.resolve(sourceDir, 'index.js') },
    output: {
        path: outputDir,
        // other options
        clean: true,
    },
    module: {
        rules: [
            {
                test: /\.css$/i,
                // options.publicPath is required for asset imports in CSS, such as url()
                use: [{ loader: MiniCssExtractPlugin.loader, options: { publicPath: '' } }, 'css-loader' ],
            },
        ],
    },
    plugins: [
        new MiniCssExtractPlugin({/* options */}),
        new CleanCssAfterCompilePlugin({ isProduction, outputDir, cleanCssOptions }),
    ],
    devtool: isProduction ? false : 'source-map',
};