webpack.config.js

const path = require('path')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const devMode = process.env.NODE_ENV !== 'production'

module.exports = {
  mode: 'development',
  devtool: 'source-map',
  devServer: {
    port: 8008,
    static: {
      directory: path.join(__dirname, 'dist'),
    },
    headers: {
      'Access-Control-Allow-Origin': '*',
    },
    compress: true,
  },
  watchOptions: {
    ignored: /node_modules/,
  },
  entry: [
    'babel-polyfill',
    './sass/viewer.scss',
    './js/viewer.js'
  ],
  output: {
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      },
      {
        test: /\.(sa|sc|c)ss$/i,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'postcss-loader',
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
            },
          },
        ],
      },
      {
        test: /\.(png|jpe?g|gif|svg|eot|ttf|woff|woff2)$/i,
        type: 'asset',
      },
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'main.css',
      chunkFilename: '[id].css',
    }),
  ],
}