webpack.config.js

let webpack = require('webpack');
let path = require('path');
const glob = require('glob');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const PurgecssPlugin = require('purgecss-webpack-plugin');

module.exports = {
  entry: ['./src/js/main.js', './src/scss/main.scss'],

  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'main.js',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.(png|jpe?g|gif)$/i,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[hash].[ext]',
              outputPath: 'images',
            },
          },
        ],
      },
      {
        test: /\.(woff(2)?|ttf|eot|svg)(\?v=\d+\.\d+\.\d+)?$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].[hash].[ext]',
              outputPath: 'fonts',
            },
          },
        ],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              sourceMap: true,
              url: true,
            },
          },
          {
            loader: 'postcss-loader',
            options: {
              sourceMap: true,
              config: {
                path: 'postcss.config.js',
              },
            },
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
            },
          },
        ],
      },
    ],
  },

  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css',
    }),
  ],
};

if (process.env.NODE_ENV === 'production') {
  module.exports.plugins.push(new webpack.optimize.UglifyJsPlugin());
  module.exports.plugins.push(
    new webpack.optimize.PurgecssPlugin({
      paths: glob.sync(path.join(__dirname, '*.html'), { nodir: true }),
    })
  );
}