webpack.config.js

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CompressionPlugin = require('compression-webpack-plugin');

module.exports = {
  mode: 'development',
  devtool: 'source-map',
  entry: {
    ['multiple-select']: './src/MultipleSelect.js',
    app: './src/app.js'
  },
  // devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',
  },
  optimization: {
    usedExports: true
  },
  output: {
    filename: 'js/[name].js',
    path: path.resolve(__dirname, 'dist')
  },
  plugins: [
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: 'css/multiple-select.css',
      chunkFilename: '[id].css',
    }),
    new CompressionPlugin(),
    new HtmlWebpackPlugin({
      template: './src/index.html'
    }),
  ],
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              publicPath: '../',
              hmr: process.env.NODE_ENV === 'development',
            },
          },
          'css-loader',
          {
            loader: 'postcss-loader', // Run postcss actions
            options: {
              plugins: function () { // postcss plugins, can be exported to postcss.config.js
                return [
                  require('autoprefixer')
                ];
              }
            }
          },
          'sass-loader'
        ]
      },
      {
        test: /\.html$/,
        use: [
          {
            loader: 'html-loader',
            options: {
              minimize: true
            }
          }
        ]
      },
      {
        test: /\.(png|jpg|jpeg|gif|svg)$/,
        use: [
          'file-loader'
        ]
      }
    ]
  },
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      '@': path.resolve('src')
    }
  }
}