webpack.dev.config.js

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

module.exports = {
  mode: 'development',
  entry: './react/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
  devtool: 'inline-source-map',
  devServer: {
    static: path.resolve(__dirname, 'dist'),
    port: 3000,
  },
  target: 'electron-renderer',
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules|electron/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin(),
  ],
};