webpack.config.js

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
  entry: './static/js/app.js',
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
      {
        test: /\.(scss)$/,
        use: [{
          loader: MiniCssExtractPlugin.loader,
        }, {
          loader: 'css-loader', // translates CSS into CommonJS modules
        }, {
          loader: 'postcss-loader', // Run post css actions
          options: {
            plugins: function() { // post css plugins, can be exported to postcss.config.js
              return [
                require('autoprefixer')
              ];
            }
          }
        }, {
          loader: 'sass-loader' // compiles Sass to CSS
        }]
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        loader: 'file-loader',
        options: {
          emitFile: false
        }
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: [
          'file-loader'
        ]
      }
    ]
  },
  plugins: [
    new UglifyJsPlugin(),
    new CleanWebpackPlugin(['static/dist']),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: 'main.css',
    }),
    new OptimizeCssAssetsPlugin()
  ],
  output: {
    filename: 'build.js',
    path: path.resolve(__dirname, 'static/dist')
  },
};