webpack.config.js

const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const path = require('path');
const Dotenv = require('dotenv-webpack');

module.exports = {
  entry: './src/app.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              [
                '@babel/preset-env',
                {
                  debug: true,
                  corejs: 3,
                  useBuiltIns: 'usage',
                },
              ],
            ],
          },
        },
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: ['url-loader?limit=10000', 'img-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      inject: false,
    }),
    new CopyWebpackPlugin({
      patterns: [{ from: 'src/assets', to: 'assets' }],
    }),
    new Dotenv(),
  ],
};