webpack.config.js

const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
    watch: false,
    target: 'electron-renderer',
    entry: './ui/src/renderer.js',
    output: {
        path: __dirname + '/ui/build',
        publicPath: 'build/',
        filename: 'bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-react']
                    }
                }
            },
            {
                test: /\.css$/,
                use: [
                    {
                        loader: MiniCssExtractPlugin.loader,
                        options: {
                            publicPath: '../',
                            hmr: process.env.NODE_ENV === 'development',
                            modules: 'global',
                        },
                    },
                    'css-loader',
                ],
            },
            {
                test: /\.(png|jpe?g|gif)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: './src/assets/[name].[ext]'
                        },
                    },
                ],
            },
            {
                test: /\.(woff|woff2|eot|ttf|otf)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: './src/assets/fonts/[name].[ext]'
                        },
                    }
                ]
            }
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: 'bundle.css',
        }),
    ],
    resolve: {
        extensions: ['.js', '.json', '.jsx']
    }
}