webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isProd = process.env.NODE_ENV === 'production';

module.exports = {
  mode: isProd ? 'production' : 'development',
  entry: './src/js/app.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {}
          }
        ]
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: !isProd
            }
          },
          'css-loader'
        ]
      }
    ]
  },
  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    compress: true,
    port: 8080,
    host: '0.0.0.0'
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'style.css'
    }),
    new HtmlWebpackPlugin({
      template: './src/index.html',
      hash: true
    })
  ],
  // @see https://www.chartjs.org/docs/2.8.0/getting-started/integration.html#bundlers-webpack-rollup-etc
  externals: {
    moment: 'moment'
  }
};