webpack.config.js

const path = require('path');
const autoprefixer = require('autoprefixer');
const precss = require('precss');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: 'production',
  entry: './src/index.js',
  devServer: {
    contentBase: './dist',
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
  ],
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist'),
  },
  module: {
    rules: [
      {
        test: /\.(scss)$/,
        use: [{
          loader: 'style-loader', // inject CSS to page
        }, {
          loader: 'css-loader', // translates CSS into CommonJS modules
        }, {
          loader: 'postcss-loader', // Run post css actions
          options: {
            plugins() { // post css plugins, can be exported to postcss.config.js
              return [
                precss,
                autoprefixer,
              ];
            },
          },
        }, {
          loader: 'sass-loader', // compiles Sass to CSS
        }],
      },
    ],
  },
  performance: {
    hints: false,
  },
};