webpack.config.js

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

const isDev = process.env.NODE_ENV === "development";

module.exports = {
  mode: isDev ? "development" : "production",
  entry: path.resolve("./src/index.js"),
  devtool: isDev ? 'eval-cheap-module-source-map' : false,
  module: {
    rules: [
      {
        test: /\.m?jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx'],
  },
  devServer: {
    port: 8080,
    hot: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/html/index.html'
    })
  ],
  performance: {
    hints: false
  },
};