webpack.config.js

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

module.exports = {
  entry: './src/renderer/app.js',
  target: 'electron-renderer',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'app.js',
    clean: true
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-react']
          }
        }
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/renderer/index.html',
      filename: 'index.html'
    })
  ],
  resolve: {
    extensions: ['.js', '.jsx']
  },
  devtool: 'source-map',
  mode: process.env.NODE_ENV === 'production' ? 'production' : 'development'
};