webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ESLintPlugin = require('eslint-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: './src/index.js',
  devtool: 'inline-source-map',
  devServer: {
    static: './',
  },
  plugins: [
    new ESLintPlugin(),
    new HtmlWebpackPlugin({
        template: './index.html',
    }),
  ],
  resolve: {
    modules: [path.resolve(__dirname, 'src'), 'node_modules'],
  },
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'build'),
    clean: true,
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: ['style-loader', {
          loader: 'css-loader',
          options: { modules: true },
        }],
      },
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              ['@babel/preset-env', { targets: { "esmodules": true } }],
              ["@babel/preset-react", { runtime: "automatic" }],
            ]
          }
        }
      },
    ]
  }
};